Paragon HVAC Series Installation, Operation And Maintenance Manual
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Paragon HVAC Series Installation, Operation And Maintenance Manual

Heating ventilation and cooling unit
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• Failure to follow safety warnings exactly could result in serious injury, death or property damage.
• Make sure to read and understand the installation, operation and service instructions in this manual.
• Improper installation, adjustment, alteration, service or maintenance can cause serious injury, death or property damage.
• Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.
ALWAYS disconnect power and gas prior to working on unit.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Installation
and service must be performed by a qualified installer, service agency or gas supplier.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance. Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately. Immediately call your gas supplier from a phone remote from the building.
• Follow the gas supplier's instructions. If you cannot reach your gas supplier, call the fire department.
Some units may contain an energy recovery wheel. By virtue of their design, all energy recovery wheels allow a level of return/
exhaust air and contaminants to be recirculated into the supply airstream. Accepting and operating this unit with or without
the energy recovery wheel in operation increases the risk of airborne bacteria, virus and contaminant spread between the
return/exhaust air, into the fresh airstream.
In accordance with ANSI/ASHRAE/ASHE Standard 170-2017, energy recovery wheel technology should not be used as a
means of ventilation for certain Health Care Facilities. An ASHRAE Position Document on Infectious Aerosols, approved by
ASHRAE Board of Directors, dated April 14, 2020, also recommends that energy recovery devices be bypassed for non-health
care facility ventilation to help reduce the spread of virus.
Any reduction of outdoor air % or volume below what this unit was designed for elevates the risk of airborne bacteria, virus
and contaminant recirculation back into the fresh airstream and the space.
Operating this unit with an exhaust level less than 50% of the supply level nullifies all return on investment statements and
limits the amount of energy recovery.
This unit, including the energy recovery wheel, must be serviced and maintained as per the Installation and Operation Man-
ual's recommended frequencies.
Upon receiving unit, check for any interior and exterior damage, and if found, report it immediately to the carrier. Check that all
accessory items are accounted for and free of damage. Turn the blower wheel by hand to verify free rotation and check the
damper (if supplied) for free operation.
Heating Ventilation and Cooling Unit - Paragon HVAC Series
Installation, Operation, and Maintenance Manual
WARNING! FIRE OR EXPLOSION HAZARD
FOR YOUR SAFETY
IMPORTANT
RECEIVING AND INSPECTION
A0033507
May 2024 Rev 16

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  • Page 1 Heating Ventilation and Cooling Unit - Paragon HVAC Series Installation, Operation, and Maintenance Manual WARNING! FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury, death or property damage. • Make sure to read and understand the installation, operation and service instructions in this manual.

  • Page 3: Table Of Contents

    Table of Contents WARRANTY ..................4 Sequence of Operation ..............95 Coastal Applications ................4 Operation Summary - Gas Heating ..........95 Furnace Warranty ................4 Modulating Gas System ..............95 CERTIFICATIONS ................4 High Temperature Limit ..............95 Listings and Standards ..............4 Flame Safety Control (FSC) ............96 INSTALLATION ..................5 Modulating Stage Sequence ............96 Mechanical ..................5...

  • Page 4: Warranty

    WARRANTY This unit comes with a standard 5-year parts warranty from date of shipment to be free from defects in materials and workmanship, under normal use and service. An extended 10-year non-prorated parts warranty is available at no extra charge when units are remotely monitored and maintained through a Service Preventative Maintenance subscription (terms and conditions apply).

  • Page 5: Installation

    INSTALLATION It is imperative that this unit is installed and operated with the designed airflow, gas, and electrical supply in accordance with this manual. If there are any questions about any items, please call the service department at 1-866-784-6900 for warranty and technical support issues. IMPORTANT For gas units, to prevent premature heat exchanger failure, do not locate any gas fired unit in areas where chlorinated, halogenated, or acid vapors are present in the atmosphere.
  • Page 6 CLEARANCE TO COMBUSTIBLE MATERIALS This equipment may be installed with clearances from the equipment to combustible material not less than 0 inches from the top, bottom, condenser side, front and back. The flue side must be installed 3 feet from combustible materials. Refer to Figure 1 for clearance details. SERVICE CLEARANCE For service accessibility and performance, this unit must have at least 3 feet of clearance on the intake and supply sides.
  • Page 7 CLEARANCE TO COMBUSTIBLE MATERIALS This equipment may be installed with clearances from the equipment to combustible material not less than 0 inches from the top, bottom, condenser side, front and back. The flue side must be installed 3 feet from combustible materials. Refer to Figure 2 for clearance details. SERVICE CLEARANCE For service accessibility and performance, this unit must have at least 3 feet of clearance on the intake and supply sides.

  • Page 8: Rigging

    Rigging WARNING! Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted. Each of the cables (chains or slings), hooks, and shackles used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length.

  • Page 9: Curb And Ductwork

    Curb and Ductwork WARNING!! Failure to properly size ductwork may cause system effects and reduce the performance of the equipment. This unit was specified for a specific CFM and static pressure. The ductwork attached to this unit will sig- nificantly affect airflow performance. When using rectangular ductwork, elbows must be radius throat, radius back with turning vanes.
  • Page 10 Figure 4 - Curb Gasket Curb Attachment Curb Point Side Return Duct/Access Panel Install, refer to Figure 5 Detail A. • Install gasket material around the upper and side edges. • Install ductwork using self-tapping screws. • Use caulk/sealant around the upper and side edges. •...

  • Page 11: Duct Hanger Dimensions

    Duct Hanger Dimensions Figure 6 provides details for standard curbs, and Figure 7 provides details for ERV curbs. Refer to Table 3 and Table 4 on page 12 for Bill of Materials and curb dimensions. Use 1/4”-20 x 5/8” Phillips pan head screws and nuts when assembling duct hangers, refer to Figure 8 on page 12.
  • Page 12 Table 3 - Duct Hanger Bill of Materials Size 1 Size 2 Size 3 Size 4 RTU1DHR = Quantity x 1 RTU2DHR = Quantity x 2 RTU3DHR = Quantity x 1 RTU2DHL = Quantity x 3 RTU3DHL = Quantity x 3 RTU4DHL = Quantity x 3 RTU1DHL = Quantity x 3 NOTE: ERV Quantity x 4...

  • Page 13: Curb And Adapter

    Curb and Adapter Figure 10 provides details when mounting return and supply duct adapters to an RTU curb. Figure 10 - Curb and Adapter Details Secure Supply Duct Adapter to Inside Flange of Duct Hangers 1. Standard RTU Curb 2. Duct Hangers 3.

  • Page 14: Supply Duct Pad Mount Clearances

    Supply Duct Pad Mount Clearances When a unit will be pad mounted, refer to Figure 11 for details on installation. Always verify the distance from the wall(s) to the unit. For the supply side of the unit, there must be adequate distance between the door and duct to service components.

  • Page 15: Duct Static Pressure Control

    Duct Static Pressure Control Figure 12 - Duct Static Pressure Control Units equipped with an Electrically Controlled Motors (ECMs) or Variable Frequency Drives (VFDs) driven supply fan, the duct static pressure control option can be used to monitor duct pressure. Pressure Transducer Located in Control 1.

  • Page 16: Hmi And Remote Room Sensor Installation

    HMI and Remote Room Sensor Installation The HMI (Human Machine Interface) is used to change settings, view operating information, and view fault history. Remote HMI faceplates (Figure 14), remote room sensors (Figure 15), and smart controls may be ordered and shipped separately.

  • Page 17: Typical Submittal Drawing

    Typical Submittal Drawing...

  • Page 18: Furnace Condensation Drain

    Furnace Condensation Drain In some applications, condensation can form in the flue collection box, especially when furnaces are located downstream of cooling coils or operate in a high-efficiency range. If condensation occurs in the flue collection box, there are fittings in the bottom of the flue collection box to drain condensation out of the box. The burner in the unit is provided with a condensation drain assembly located underneath this fitting for the condensation to collect.

  • Page 19: Cooling Coil Trap

    Cooling Coil Trap There is a field plumbing connection that is required for the DX/cooling coil. This connection is for the drain pan located under the DX/cooling coil. Also, it is recommended that all plumbing connections be sealed with Teflon tape or pipe dope. Install Condensate Trap Assembly to 1”...

  • Page 20: Gas

    Installation of gas piping must conform with local building codes, or in the absence of local codes to the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in accordance with CAN/CGA-B149.1 for natural gas units and CAN/CGA-B149.2 for propane units. WARNING: Inlet gas pressure must not exceed pressure indicated on nameplate.

  • Page 21: Gas Train

    Gas Train A strainer must be installed to prevent debris from entering the gas train. Only use new piping. Properly ream and clean metal burrs. Proper care is needed to ensure that the gas flow is in the same direction as indicated on the strainer.

  • Page 22: High Altitude And Gas Type Orifice Sizing

    High Altitude and Gas Type Orifice Sizing The burner orifices should be sized per Table 6 and Table 7, depending on fuel type, furnace size, and altitude. Standard orifice sizes are for sea level. The unit should be ordered with the altitude specific orifices, or the parts should be ordered through the manufacturer (Table 8 on page 23).
  • Page 23 Table 7 - LP Gas High Altitude Conversion Size 3 Size 2 and 3 Size 1, 2, and 3 High Altitude for 500,000 High Altitude for 400,000 High Altitude for 300,000 to 150,000 BTU Altitude Input Rate Drill Size Input Rate Drill Size Input Rate Input Rate...

  • Page 24: Lp Conversion Kit For Rtu Series

    LP Conversion Kit for RTU Series LP/Natural Gas conversion kits are used to convert from one gas type to another in the field. This kit is used on all RTUs, and the part numbers in Table 9 should be used on furnace sizes listed. Kits contain: •...

  • Page 25: Pre-Conversion Unit Check-Out

    Pre-Conversion Unit Check-Out The following procedure is intended as a guide to aid in determining that the appliance is properly installed and is in a safe condition for continuing use. It should be recognized that generalized test procedures cannot anticipate all situations. Accordingly, in some cases, deviation from this procedure may be necessary to determine safe operation of the equipment: •...

  • Page 26: Gas Conversion Instruction

    Gas Conversion Instruction Warning This conversion kit shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. If the information in these instructions is not followed exactly, a fire, explosion or production of carbon monoxide may result causing property damage, personal injury or loss of life.

  • Page 27: Electrical

    Electrical WARNING!! Disconnect power before installing or servicing control. High voltage electrical input is needed for this equipment. A qualified electrician should perform this work. Before connecting power to the unit, read and understand the entire section of this document. As-built wiring diagrams are furnished with each control by the factory and are attached to the module’s door.

  • Page 28: Building To Unit Power Wiring Connection

    Building to Unit Power Wiring Connection NOTE: Only Use Copper Wiring for Disconnect. Figure 21 - Conduit Termination/Disconnect Switch Wiring Size 3 Unit Shown 208/460/600 V 3 PH. Safety Disconnect Safety Switch Disconnect Switch Gal-flex Conduit Main Power to Unit’s Safety Disconnect Switch from Building Breaker.

  • Page 29: Typical Wiring Schematic

    Typical Wiring Schematic WIRE SHIELDED (I/P) (I/P) IGNITOR SW-15 VOUT SW-16 SW-04 VOUT SW-17 SW-13 VOUT SW-03 VOUT EC1-...

  • Page 30: Variable Frequency Drive (Vfd)

    Variable Frequency Drive (VFD) WARNING! - Before installing the VFD drive, ensure the input power supply to the drive is OFF. - The power supply and motor wiring of the VFD must be completed by a qualified electrician. - The VFD is factory programmed, only change if replaced or ordered separately. Consult the VFD manual and all documentation shipped with the unit for proper installation and wiring of the VFD.

  • Page 31: Vfd Output Power

    VFD Output Power • Motor wires from each VFD to its respective motor MUST be routed in a separate steel conduit away from control wiring and incoming AC power wiring. This is to avoid noise and crosstalk between drives. An insulated ground must be run from each VFD to its respective motor.

  • Page 32: Actech Smv Vfd

    ACTECH SMV VFD Table 12 - Cross-Reference 1Ø 3Ø Input Amps 1Ø Input Amps 1Ø Output Breaker 1Ø Breaker 1Ø Part Number Volts Input Input 120V AC 240V AC Amps 120V AC 240V AC ESV371N01SXB571 120/240V ESV751N01SXB571 120/240V 16.6 ESV112N01SXB571 120/240V 1Ø...

  • Page 33: Make-Up Air (Mua) Board Connectors

    Make-up Air (MUA) Board Connectors The Make-up Air Board (Figure 23) is located in the main cabinet, refer to Figure 25 for location. Circuit 1 Cooling inputs/outputs are located on the MUA Board. Circuit 2/3 Cooling inputs/outputs are located on the Advanced Cooling Board (ACB).
  • Page 34 NOTE: Some connections may not be used dependent on system configurations RJ45 connectors Connector J1 and J2 are associated with BMS. Connector J3 through J6 are interchangeable and may be used to connect to an HMI or VFD. J1 - CASLink/Slave J4 - HMI/VFD/Master J2 - CASLink/Slave J5 - HMI/VFD/Master...
  • Page 35 Connector J8 contains inputs and outputs for the Flame Safety Controller (FSC) Pin 10 - 24VAC Input from Vent Proving Switch  Pin 1 - 24VAC Output to Pressure Switch Input (PSW) on FSC or Electric Heater (option) (J8-1) / Electric Heat Dry Contact Pin 2 - 24VAC Output to Thermostat Input ...
  • Page 36 Connector J11 contains low voltage screw terminal connections BAS/STAT Pin 1 - 24VAC Auxiliary Input/Purge Mode Pin 5 - 24VAC Call for Cooling Input Pin 2 - 24VAC Auxiliary Input Pin 6 - 24VAC Call for Blower Input Pin 3 - 24VAC Auxiliary Input Pin 7 - 24VAC Occupied Override Input Pin 4 - 24VAC Call for Heat Input Pin 8 - 24VAC Isolated Common...
  • Page 37 Connector J14 contains screw terminal connections AI-2 AI-3 Pin 1 - 24VAC Output to Intake RH Pin 5 - 24VAC Output to Space RH Pin 2 - 0-10VDC Analog Input from Intake RH Pin 6 - 0-10VDC Analog Input from Space RH Pin 3 - 24VAC Common to Intake RH Pin 7 - 24VAC Common to Space RH Pin 4 - 24VAC Common to Humidity Sensor...
  • Page 38 Connector J18 contains low voltage connections Pin 1 - 24VDC + Output for Spare Pin 9 - 0-10VDC Analog Output for Mixing Box Pin 2 - 0-10VDC Analog Output for Mixing Box Actuator Actuator Pin 10 - 0-10VDC Analog Output for Bypass Pin 3 - 0-10VDC Analog Output for Bypass Damper/ Damper/Powered Exhaust Powered Exhaust...
  • Page 39 Connector J25 contains low voltage screw terminal connections for DDC Communications Isolated Pin 1 - RS-485 + Pin 3 - RS-485 Common Pin 2 - RS-485 - Connector J26 Programming Port Connector J27 USB Programming Port Connector J28 contains low voltage screw terminal connections DI-2 AI-4...
  • Page 40 Connector J30 contains 120V AC connections Pin 1 through Pin 7 - N/A Pin 8 - 120VAC Alarm Output Connector J31 contains inputs and outputs for components Pin 1 - 24VDC + Output to Outdoor RH Sensor Pin 10 - 24VDC + output to Return RH Sensor Pin 2 - 0-10VDC Analog Input from Outdoor RH Pin 11 - 0-10VDC Analog Input from Return RH Sensor...
  • Page 41 Connector J32 contains inputs and outputs for components Pin 1 - 24VAC Output for High Air Airflow Switch Pin 10 - 24VAC Input from High Airflow Switch Pin 2 - PWM + Output for Exhaust/Power Vent ECM Pin 11 - PWM - Output for Exhaust/Power Vent Pin 3 - 24VAC Output for Proof Of Closure / HE Furnace Float Switch Pin 12 - 24VAC Input from Proof of Closure / HE...
  • Page 42 Connector J35 contains low voltage connections THERMISTORS Pin 1 - Suction Line Thermistor Input Pin 6 - Evap/Indoor Thermistor Input Pin 2 - Suction Line Thermistor Input Pin 7 - Condenser/Outdoor Coil Thermistor Input Pin 3 - Liquid Line Thermistor Input Pin 8 - Condenser/Outdoor Coil Thermistor Input Pin 4 - Liquid Line Thermistor Input Pin 9 - Compressor Discharge Thermistor Input...
  • Page 43 MODBUS Connector J38 Modbus Pin 1 (A) - Modbus (-) Pin 3 (C) - Modbus Ground Pin 2 (B) - Modbus (+) Dip Switch S1 Switch 1, 2, 3 always OFF. Switch 4 Always ON. If Switch 4 is OFF, BAS terminals disabled. Dip Switch S2 Programming - Service Only Dip Switch S3...

  • Page 44: Acb Connectors

    ACB Connectors The Advanced Cooling Board (ACB) (Figure 24) is located in the main cabinet, refer to Figure 25 for location. Circuit 1 Cooling inputs/outputs are located on the MUA Board. Circuit 2/3 Cooling inputs/outputs are located on the ACB. Figure 24 - Advanced Cooling Board (ACB) ALRM HEAT...
  • Page 45 NOTE: Some connections may not be used dependent on system configurations RJ45 connectors Connector J1 and J2 are associated with BMS. Connector J3 through J6 are interchangeable and may be used to connect to an HMI or VFD. J1 - CASLink/Slave J2 - HMI/VFD/Master Connector J4 USB Programming Port Connector J5 Stepper Motor (EEV 1)
  • Page 46 Connector J8 Stepper Motor (Reheat Valve 2) (Reheat Valve 2 = Circuit 3) Pin 1 - Stepper Motor 2, 12V, Bipolar Pin 3 - Stepper Motor 2, 12V, Bipolar Pin 2 - Stepper Motor 2, 12V, Bipolar Pin 4 - Stepper Motor 2, 12V, Bipolar Connector J9 contains inputs and outputs for com- ponents Pin 1 - 24VDC + output to Discharge Line Pressure...
  • Page 47 Connector J10 contains inputs and outputs for components Pin 1 - 24VDC + output to Discharge Line Pressure Pin 10 - 24VAC constant output to High Pressure Transducer 2 Switch Compressor 2 Pin 2 - 0-10VDC Analog Input from Discharge Line Pin 11 - 24VAC Input for High Pressure Switch 2 Pressure Sensor Compressor 2...
  • Page 48 Connector J12 contains inputs and outputs for components Pin 1 - 24VAC Output to Compressor 1 Pin 9 - 24VAC Input for Compressor 1 Phase Pro- Pin 2 - 24VAC Output to Oil Solenoid 1 tection Pin 3 - 24VAC Constant Output to Compressor 1 Pin 10 - 24VAC Common to Compressor 1 Overload Pin 11 - 24VAC Common to Oil Solenoid 1...
  • Page 49 Connector J15 N/A Connector J16 contains low voltage screw terminal connections THERMISTORS Pin 1 - Suction Line Circuit 1 Temperature Input Pin 7 - Condenser/Outdoor Coil 1 Thermistor Input Pin 2 - Suction Line Circuit 1 Temperature Input Pin 8 - Condenser/Outdoor Coil 1 Thermistor Input Pin 3 - Liquid Line Circuit 1 Temperature Input Pin 9 - Compressor Discharge Line Circuit 1 Tem- Pin 4 - Liquid Line Circuit 1 Temperature Input...

  • Page 50: Component Location

    Component Location Use Figure 25 through Figure 32 for component locations. Units equipped with ERV, refer to “Energy Recovery (Optional)” on page 105 for component descriptions and locations. Figure 25 - Typical Main Cabinet (Size 1-3) Differential Pressure Transducer – Monitors air pressure differential between two points. Used in different air control options.
  • Page 51 Figure 26 - Typical Main Cabinet (Size 4) Transformer (TR-xx) – 40VA 120V to 24V/20VA 120V to 24V. Verify transformers on schematics, varies by application. Make-Up Air (MUA) Board - Controls the 0-10V DC signal to modulating furnace controls, modulating gas valve, and 24V AC signals to staged furnace controls.
  • Page 52 Figure 27 - Typical Refrigerant Access Panel Heat Pump with Reheat shown Refrigerant Low Pressure Switch (SW-15) – Detects refrigerant pressure on the low-pressure side of the system. If the pressure drops below the preset value, the compressor will shut down. This sensor has an automatic reset. Suction (Low) Line Pressure Sensor (PS-21) –...
  • Page 53 Figure 28 - Gas Furnace Cabinet Typical Standard Gas Furnace High Turndown Furnace Option Furnace Power Vent (PV-xx) – An assembly used to exhaust flue gases. High-Pressure Gas Switch (PS-03) – Monitors pressure and shuts down heating when pressures rise above the desired set point.
  • Page 54 Figure 29 - Typical Burner Cabinet Single Burner Split Burner Ignitor – Powered by Flame Safety Control to initiate light-off. Rollout Switch 1 (SW-05) – Normally closed temperature activated switch. Mounted on bracket at the firing tube. Senses flame roll-out in the event of a blocked tube, low airflow, or low gas pressure. If flame-rollout is present, the switch de- energizes heater circuit on the furnace.

  • Page 55: Optional Components

    Figure 31 - Typical Blower and Air Intake Access Doors/Panel Condensing Fan Motor (MT-xx) – Pulls air across the outdoor coil. Supply Motor (MT-01) – Located behind door. Main supply air motor. Discharge Temperature Sensor or Discharge Humidity/Temperature (SN-xx) – Monitors discharge air temperature or humidity/temperature.

  • Page 56: Electric Heater Option

    Electric Heater Option The electric coils on the heater are controlled using Silicon Controller Rectifier (SCR) controls. SCR is a time proportioning type controller that modulates the heater and supplies the exact amount of power to match the heat demand. The three black wires from the electric heater will need to be field wired to the disconnect switch.

  • Page 57: Compressor Information

    Compressor Information Oil return management – Insufficient lubrication can be the result of oil depositing itself in pipes and bends. Return management helps oil deposits to return to the crankcase by: • Increasing velocity for short periods at regular time intervals. •...

  • Page 58: Compressor Vzh 088/117/170

    Compressor VZH 088/117/170 When oil return management is enabled, the frequency converter performs an oil boost when the compressor is below 3000 RPM (100 Hz). The oil boost will happen every 60 minutes for 30 seconds when the compressor speed is below 3000 RPM (100 Hz). When “Hands On” mode is selected, the oil return management will not be active, even if the parameter is set to be on.

  • Page 59: Compressor Drive Information

    Compressor Drive Information Refer to Figure 35 for CDS 803 controller interface. Refer to Figure 36 for CDS302/303 controller interface. CDS803 Quick Menu Navigation The parameter setting for the compressor drive is factory set and should not be adjusted unless specified by a service representative.

  • Page 60: Cds302/303 Quick Menu Navigation

    CDS302/303 Quick Menu navigation The parameter setting for the compressor drive is factory set and should not be adjusted unless specified by a service representative. If replacing the compressor drive, verify the settings match the compressor drive parameter settings. If settings need to be programmed, proceed with the following: •...

  • Page 61: Operation

    OPERATION Accessing Menu Configurations Figure 37 - HMI Screen General Overview SPACE The HMI (Human Machine Interface) allows the user to change parameters and options. The user may use the HMI to view operating information regarding 70°F sensors, temperatures, pressures, and fault history on the HMI screen (Figure 37).

  • Page 62: Hmi Configuration Menu

    HMI Configuration Menu To enter the configuration menu (Figure 40), press the bottom two buttons simultaneously on the HMI faceplate. In this menu screen, you may adjust Communication and Advanced Options, check Status, and About information. Figure 40 - Configuration Menu MENU Configuration Communication...

  • Page 63: Scheduling

    Scheduling To set a schedule on the HMI (Figure 41), you must first enable scheduling: Factory Settings > Occupancy Config > Scheduling > On Set your sensor temperature set points for occupied and unoccupied schedules: User Settings > Temp Set Points >...

  • Page 64: Menu Descriptions

    Menu Descriptions USER SETTINGS Temp Set Points - Some Set Points (SP) may not be available based on settings. If scheduling is enabled, there will be occupied (Occ) and Unoccupied (Unocc) values for each SP. The user will be allowed to check or adjust: •...
  • Page 65 • Humidity Ctrl - Adjustable settings dependent on “Reheat Mode” selection. • RH Set Points - Relative Humidity SP TEMP SET POINTS • Intake - Dehumidification will activate if the intake RH HUMIDITY CTRL is above this value. “Activate Based On” must be set to Intake, Both, Either, or Stat.
  • Page 66 • Option Set Points - Adjustable Set Points (SP) for options that are enabled to “ON” in Factory Settings. • Room Override The discharge air temperature set- TEMP SET POINTS point that the unit will revert to when room override logic OPTION SET POINTS is active (see Factory Settings - Room Override for RANGE: 40-150°F/4-66°C...
  • Page 67 Scheduling - This menu will only show when the scheduling option is set to On. • Schedule Times - Each day contains the option for three SCHEDULING occupied time periods. If the time is set past 11:59 pm, it START A/B/C - UNOCC/TIME SCHEDULING TIMES MONDAY-SUNDAY END A/B/C - UNOCC/TIME...
  • Page 68 Single Zone VAV - Blower speed and damper position ranges for the single zone VAV logic (see Factory Settings - Single Zone VAV for more information). This menu will only SINGLE ZONE VAV populate if a Single Zone VAV option is configured. RANGE: MIN - MAX % •...
  • Page 69 ERV Settings - Energy Recovery Ventilator (ERV) settings. This menu will only populate if ERV is configured. • ERV Wheel - Adjustable ERV wheel speed when ERV ERV SETTINGS wheel control is set to manual. This setting is typically hid- RANGE: MIN - MAX FAN SPEED ERV EXHAUST FAN SPEED OCC/UNOCC...
  • Page 70 FACTORY SETTINGS - Factory Menu Password = 1111 Temperature Control - The MUA board monitors tempera- ture control components. • Tempering Mode - This setting dictates what conditions TEMPERATURE CONTROL or inputs the unit will use to control heating, cooling, and TEMPERING MODE dehumidification after they are active.
  • Page 71 • Gas Valve Limits • V1 Min/V2 Min - Limits min voltage for modulating gas valve. HEATING CONFIG • V1 Max/V2 Max - Limits max voltage for modulating GAS HEAT CONFIG gas valve. • High Fire - Limits high fire voltage. GAS VALVE LIMITS RANGE: 0-10V •...
  • Page 72 • HP Set Points • Min OA Temp - The heat pump will shut off when the OA temp drops below this SP. HEATING CONFIG • Max OA Temp - The heat pump will shut off when the OA temp rises above this SP. HEAT PUMP CONFIG •...
  • Page 73 • Superht SP - Start-up target superheat during ELA HP start-up. • Superht Time - The timer for the modified superheat HEATING CONFIG target during ELA HP start-up HEAT PUMP CONFIG • Crankcase - When enabled on, and ELA HP is active, EXTREME LOW AMBIENT the crankcase heater will operate when the compres- sor is on.
  • Page 74 • Cool Hyst • Intake - The intake tempering sensor must be this amount of degrees below the set point before cooling COOLING CONFIG turns off. COOL HYST • Space - The space tempering sensor must be this RANGE: 0.3-10°F/0.3-6°C SPACE amount of degrees below the set point before cooling DEFAULT: 1.0°F/1.0°C...
  • Page 75 • Reheat Valve Model - Valve model selection. • Reheat Optimization - Enabled On, the user may adjust optimization On/Off Timers. COOLING CONFIG • On Time - Increase condensing fan differential when REHEAT CONFIG reheat PID is at 100% for On Time setting and outdoor REHEAT VALVE MODEL MODEL temp is below 76°F.
  • Page 76 • Reheat Oil Boost - When an oil boost is active, the reheat valve will move to this set position. COOLING CONFIG • Comfort Reheat - When enabled, the reheat valve can be used/opened in a standard cooling call to achieve REHEAT CONFIG target discharge conditions.
  • Page 77 • Sol Active - A timer for the bypass solenoid to boost suction pressure on ELA start-up. • Sol Delay - A delay timer before bypass solenoid opens COOLING CONFIG after ELA start-up. EXTREME LOW AMBIENT • Cond Min/Max - The minimum and maximum rate the RANGE: 0-600 S condensing fans will operate during ELA operation.
  • Page 78 • Pumpdown Sequence - Compressor soft stop and liquid migration protection to store most of the refrigerant in the outdoor coil during an off cycle. Before the pumpdown COMPRESSOR CONFIG sequence begins, an oil boost will run to return oil back to ON/OFF the compressor before shutting down.
  • Page 79 • Monitoring Sensors - Values that are associated with the operation of the ERV. Sensor pressure values monitor how much dirt and debris are collected on the filters and wheel. ERV CONFIG • Door Interlock - When enabled, a “Door Interlock” fault will display when the blower door is open during normal MONITORING SENSORS operation.
  • Page 80 • S REF DB - Defines the limits the unit will adjust to keep supply fan reference. Only displayed when Exhaust Fan Control is set to supply reference. ERV CONFIG • S REF SP - If the pressure difference between the sup- ply and exhaust is greater/less than this set point, the EXHAUST FAN CONFIG MUA board will attempt to adjust the output voltage until...
  • Page 81 Occupancy Config • Scheduling - This menu is where scheduling may be turned On or Off. OCCUPANCY CONFIG • Override - Allows the user to override the current occupied ON/OFF SCHEDULING DEFAULT: OFF settings. ON/OFF OVERRIDE DEFAULT: OFF Unit Options UNIT OPTIONS •...
  • Page 82 • Blower Config • Blower Control • 120V Contactor - 120V output on the MUA board to UNIT OPTIONS energize the coil of a contactor. BLOWER CONFIG • ECP - This option should be selected when the supply 120V CONTACTOR, ECP, VFD MANUAL, fan VFD is wired to a hood control package control VFD JOG, VFD 0-10V, VFD PRESSURE, BLOWER CONTROL...
  • Page 83 • DD Wheel Size - Selection for wheel size and settings. • Size - This selection is utilized for CFM monitoring. UNIT OPTIONS Dual blower models will have a ‘2’ assigned after the wheel size model number. BLOWER CONFIG • K2 Factor - Used for supply CFM calculations. DD SUPPLY WHEEL SIZE •...
  • Page 84 • Purge Config • Purge Button - When enabled On, a purge button will be displayed on the HMI. When the purge button is UNIT OPTIONS pressed, the damper will open to max outdoor air and PURGE CONFIG turn on the exhaust contactor. ON/OFF PURGE BUTTON •...
  • Page 85 • CO Shutdown - When enabled, if J12-6 reaches 10V, shut down the unit (blower, heating, and cooling). • PT Max Config - Select pressure range for suction line, UNIT OPTIONS discharge line, or liquid line sensors. MONITORING SENSORS • High Duct PS Config - When enabled, if the duct UNIT/HEAT CO SHUTDOWN pressure is greater than the set point for longer than the...
  • Page 86 • Economizer Config - Refer to “Economizer” on page 101. UNIT OPTIONS • Economizer Mode - Off, Fixed Dry Bulb, Diff (Differ- OUTDOOR AIR CONFIG ential) Dry Bulb, Fixed Enthalpy, Diff Enthalpy. • Disable Cooling - When the economizer is using an ECONOMIZER CONFIG outside air % greater than this setting, mechanical OFF (DEFAULT), FIXED DRY BULB,...
  • Page 87 • Outdoor Reset - Access to setting option On/Off. Scenar- ios for Outdoor Reset functionality: - Discharge Heat Tempering: If outside air is below OA UNIT OPTIONS Reset Low set point, heat will discharge to Reset Heat ON/OFF OUTDOOR RESET Discharge setting.
  • Page 88 • Unit Performance - Adjustable points for monitoring. For service settings, go to Service > Unit Performance. • CFM - Design CFM. UNIT OPTIONS • Min/Max Duct SP - Design duct static pressure. • Min/Max Building SP - Design building static pressure. UNIT PERFORMANCE •...
  • Page 89 SERVICE SETTINGS - Factory Menu Password = 1234 Temperatures - Display monitoring for temperature values. MONITORING TEMPERATURE RH Values - Current RH value readings per HMI. TEMPERATURES SENSOR READINGS CO2 Values - Current CO2 value readings per HMI. RH VALUES Pressure Values - Current Pressure readings per HMI.
  • Page 90 Unit Performance- Compares Unit Options > Unit Performance to current unit’s operational values. • Dsn CFM - Design CFM. Job specific unit CFM. UNIT PERFORMANCE • Act CFM - Actual CFM. Current unit CFM reading. DESIGN CFM • Min/Max Dsn D SP - Design duct static pressure. Job DSN CFM READINGS specific external static pressure.
  • Page 91 Test Menu • Test Fans - Test operation of unit’s fans. • Test Heating - Contains high fire, low fire, and analog TEST MENU tests. The analog test simulates a voltage input from a OFF, ALL, SUPPLY, EXHAUST, TEST FANS STATE POWERED EXHAUST, COND FANS BMS system.

  • Page 92: Unit Operation

    UNIT OPERATION WARNING: Gloves and safety glasses must be worn when servicing refrigeration equipment. Before starting or operating the unit, verify all fasteners are secure and tight. In particular, check the set screw in the wheel hub. Verify power and gas are OFF to the unit. Before connecting the unit to power, turn the fan wheel by hand to verify it is not striking the inlet, or there are any obstructions.

  • Page 93: Start-Up Procedure Heating

    Start-Up Procedure Heating Furnace Start-Up Summary 1. Open the field-installed manual gas shut-off valve and ensure the On/Off gas control valve knob is set to ‘On.’ 2. Check inlets to all firing tubes on the furnace and ensure that they are all clear of foreign debris. Verify that the tubes line up properly with each nozzle of the gas manifold.

  • Page 94: High Fire Burner Adjustment

    High Fire Burner Adjustment 1. Set the unit into high fire mode. This is achieved by configuring high fire by going into the HMI’s configuration, refer to “Accessing Menu Configurations” on page 61. Go to: Service > Test Heating > State > High Fire. 2.

  • Page 95: Sequence Of Operation

    Sequence of Operation Operation Summary - Gas Heating When there is a call for heat, the main blower is turned “On” and the airflow switch is proven. • The Flame Safety Controller (FSC-1) sends 120V AC power to the line input of the power vent blower. •...

  • Page 96: Flame Safety Control (Fsc)

    Flame Safety Control (FSC) The Flame Safety Control (FSC) is present only to monitor the flame, NOT to control temperature. The FSC uses a sensor mounted at the intake of the upper-most firing tube of the furnace to sense the existence of a flame.

  • Page 97: Re-Circulating Control Options

    Re-Circulating Control Options The ratio of outdoor to indoor air in the discharge supply air can be adjusted through the MUA board output. The board will output a 0-10V DC signal to command the position of the damper. There are several options for controlling the position of this damper.

  • Page 98: Heating, Cooling, Defrost, And Reheat

    Heating, Cooling, Defrost, and Reheat Figure 45 - Heat Pump with Reheat Option Outdoor Fan(s) Supply Fan Hot Gas Reheat Valve (HG-1) Discharge Line Filter/Drier Discharge High Pressure Refrigeration Reversing Sensor Pressure Liquid Line Pressure Valve Switch Sensor Compressor Electronic Expansion Valve Outdoor Coil Accumulator...
  • Page 99 Cooling cycle Figure 46 is a basic representation of the cooling cycle. • When the cooling sequence is initiated, the compressor and outdoor fan start. The cooling system is now in operation. Once the thermostat is satisfied, the system will shut down. •...
  • Page 100 Defrost cycle (heat pump) • In heating mode, the outdoor (condensing) coil acts as the evaporator coil. Moisture from the outside air condenses on the outside coil, and normally runs off. During the colder part of the heating season, this moisture freezes. This frozen moisture blocks air movement through the coil. A defrost cycle needs to be run to remove the frost.

  • Page 101: Economizer

    Economizer Economizer type sets the type of economizer logic that will be used. This feature will control the economizer using a 0-10V DC signal output on the MUA board. The table below shows option selections and definitions. Use the HMI to select Economizer type. Go to Factory Settings > Unit Options > Outdoor Air Config > Economizer.

  • Page 102: Psychrometric Chart

    Psychrometric Chart Fixed Dry Bulb Economizer Psychrometric Chart Normal Temperature I-P Units Sea Level Barometric Pressure: 29.921 Inches of HG Set Point Temp Economizer Band Low Limit Temp MIN OA MAX OA DRY BULB TEMPERATURE - °F 100% Outdoor Air ENTHALPY - BTU PER POUND OF DRY AIR Differential Dry Bulb Economizer Psychrometric Chart...

  • Page 103: Fixed Total Economizer

    Fixed Total Economizer Psychrometric Chart Normal Temperature I-P Units Sea Level Barometric Pressure: 29.921 Inches of HG Set Point Temp Economizer Band Low Limit DP Set Point %RH High Limit DP MIN OA Outdoor Air MIN OA 100% MAX OA DRY BULB TEMPERATURE - °F ENTHALPY - BTU PER POUND OF DRY AIR Differential Total Economizer...
  • Page 104 Hydronic Heating/Cooling (Optional) The Hydronic Heating Coil is located below the blower with field-piped connections in the bottom of the electrical cabinet. The Inlet and Outlet are both labeled accordingly, and there are factory installed ball valves and drains for maintenance. The Chilled Water Coil is located upstream of the blower with field-piped connections located in the chilled water compartment.

  • Page 105: Energy Recovery (Optional)

    Energy Recovery (Optional) The Energy Recovery (Enthalpy) Wheel is assembled and installed from the factory. Minimal maintenance will provide years of trouble-free service. If the unit is equipped with the optional enthalpy wheel, energy recovery is provided by pulling outside air across half of the wheel and moving exhaust air across the other half.

  • Page 106: Drive Motor

    Drive Motor The enthalpy wheel comes standard with a variable speed drive motor, which is pre-wired to turn in the proper direction. The motor can adjust speed to lower the enthalpy’s wheel capacity during frosting conditions. This lowered capacity allows the wheel to recover energy still while preventing frosting. During non-frosting conditions, the modulation of the wheel allows enhanced capacity control of wheel for greater turn-down and more precise discharge control.

  • Page 107: Field Installation Of Large Ervs

    Field Installation of Large ERVs Due to their larger size, all size 4 ERVs are shipped loose and must be mounted and wired in the field. This section and Figure 53 through Figure 56 on page 108 cover the install and wiring process for large ERVs. These larger ERVs will have hardware bags and gasket rolls placed inside before shipping.
  • Page 108 After the units are positioned correctly, push the bolts through the aligned holes on the side mounting brackets and hand tighten the nuts on the other side. BOTH SIDES MUST HAVE THE BOLTS INTALLED AND HAND TIGHTENED. Working around the unit (from side to side), uniformly tighten the bolts to bring the modules together. Ensure the gasket between the two mating surfaces are compressed.

  • Page 109: Service Information

    SERVICE INFORMATION WARNING: Technicians must be certified by an EPA-approved training and certification program to service any HVAC equipment, regardless of the refrigerant. Basic Service NOTE: Always wear gloves and eye protection when working with refrigerant. NOTE: Purge lines before connecting to service ports. Figure 57 - Refrigeration Service Tools and Service Port Locations V acuum Pump Gauge Set...

  • Page 110: Monitoring The A/C System

    Monitoring the A/C System NOTE: Do not add or remove refrigerant based on the impulse to achieve a subjective subcooling value. Refer to “Superheat and Subcooling” on page 134 for more information. Monitoring with HMI The HMI can monitor the A/C temperature and pressure readings through the service function menu. Enter HMI menu function by pressing the top two buttons simultaneously.

  • Page 111: Recovering Refrigerant From The System

    Recovering Refrigerant from the System 1. Connect vacuum rated manifold service hoses, refer to Figure 57 on page 109: • Red service hose to the high side service port. • Blue service hose to the low side service port. • Connect the yellow service hose to the inlet port of the recovery machine. •...

  • Page 112: Evacuating The System

    Evacuating the System 1. Connect vacuum rated manifold service hoses, refer to Figure 57 on page 109: • Red service hose to the high side service port. • Blue service hose to the low side service port. • Connect the yellow service hose to the vacuum pump. 2.

  • Page 113: Charging An Empty System

    Charging an Empty System 1. Connect the manifold service hoses, refer to Figure 57 on page 109: • Blue service hose to the liquid side service port. • Connect the yellow service hose to refrigerant source. 2. Connect a temperature clamp near the liquid line service port located on the outdoor coil, refer to Figure 57.

  • Page 114: Charging System Low On Refrigerant

    Charging System Low on Refrigerant NOTE: Do not add or remove refrigerant based on the impulse to achieve a subjective subcooling value. Refer to “Superheat and Subcooling” on page 134 for more information. 1. To add refrigerant with system running, open the low side hand valve (blue). 2.

  • Page 115: Troubleshooting

    TROUBLESHOOTING The following tables and information list possible causes and corrective actions for possible problems. Review this section prior to consulting technical support. System Troubleshooting Chart Problem Potential Cause Corrective Action Check voltage to the unit. Check the disconnect switch. Unit will not start Power failure Check the circuit breaker.

  • Page 116: Hmi Fault Codes

    HMI Fault Codes Problem Potential Cause Corrective Action Possible fire present. Check for voltage on terminal F. There should be no voltage. A 120V AC signal was detected on the Verify connector J9 is secure. Pin 3 and 8 Fire Fire input (terminal F).
  • Page 117 Problem Potential Cause Corrective Action If option is off, turn on in HMI. Verify incoming gas pressure. Check wiring. Repair broken or loose wir- The normally closed switch is open. The High Gas PS ing connections. 24V AC input signal is no longer present (optional) Verify high/low fire setting, refer to at connector J13-pin 11.
  • Page 118 Problem Potential Cause Corrective Action Verify door switches are wired properly, if Door Interlock required. Check door interlock settings in HMI. No signal to control board from the door Check doors for obstructions/alignment switch(es). issues. ERV Door Interlock Check ERV door interlock settings. Go to Factory Settings >...
  • Page 119 Problem Potential Cause Corrective Action Intake Stat Broken Check for faulty wiring, refer to “Tem- perature Sensor” on page 140. Dschrg Stat Broken Space Stat Broken OA Stat Broken The thermistor input is reading an exces- Return Stat Broken sively high temperature (low resistance/ Suction Line Broken short circuit).
  • Page 120 Problem Potential Cause Corrective Action Verify max discharge set point. Verify airflow. FSC1 High Temp The high limit switch is tripped (open cir- Verify accuracy of discharge temperature FSC2 High Temp cuit). senor. Verify furnace modulation. Refer to high/ low fire settings, refer to page 94. Check wiring to the switches.
  • Page 121 Problem Potential Cause Corrective Action Verify refrigerant high pressure switch operation. Reset if the switch is tripped. Verify coils are not restricting airflow. Refrdg Dschrg The refrigerant discharge line tempera- Verify air filters are not restricting airflow. Temp (Circuit 1/2/3) ture switch has detected high tempera- Perform condenser fan test to make sure - Heat Pump Only...
  • Page 122 Problem Potential Cause Corrective Action Verify suction and discharge pressure transducer readings are accurate. Verify coils are not restricting airflow. Verify air filters are not restricting airflow. The indoor and outdoor coil operating Verify supply airflow. Env Angle temperatures (suction and discharge sat- Perform condenser fan test to make sure uration temperatures) are out of range.
  • Page 123 Problem Potential Cause Corrective Action Verify electric heat wiring. check for 24V AC is present on terminal I. Check electric heater wiring to board connector J7 pin 10. Check incoming power at the heater dis- Voltage input is lost while the electric connect.
  • Page 124 Problem Potential Cause Corrective Action Check for shorts to ground between com- pressor and VFD. Disconnect wiring at compressor and meg compressor leg to ground. The VFD senses there is current from the Disconnect wiring at compressor and Earth Fault output phases to earth.
  • Page 125 Problem Potential Cause Corrective Action The disable space temperature feature is active. The unit sensed a space tempera- Space Temp Dis- Check the space temp disable option in ture out of range and automatically abled User Settings. reverted to discharge temperature con- trol.

  • Page 126: Condensing Fan Blink Codes

    Condensing Fan Blink Codes The condensing fan is equipped with an LED indicator light for troubleshooting. Count the LED’s blinks, refer to Figure 58, then compare to LED Code. Figure 58 - Status LED Motor Cover Status LED LED Code Potential Cause Corrective Action Unit switches OFF and automatically ON when the...
  • Page 127 LED Code Potential Cause Corrective Action If the DC-link voltage rises above the limit within DC-link undervoltage 75 seconds, then the controller will attempt to start. If the DC-link voltage drops below a specified limit the Should the DC-link voltage stay for more than 75 device will switch off.
  • Page 128 LED Code Potential Cause Corrective Action The error is displayed after the set time. The device a) Vibration values continues to operate unchanged. If the vibration velocity rises above the specified Check the impeller for damage, contamination, or ice limits, an error message is issued. formation.

  • Page 129: Compressor Drive Vfd Troubleshooting Chart

    Compressor Drive VFD Troubleshooting Chart Problem Potential Cause Corrective Action Check the cables from the converter to the compressor. There is current from the output Earth Fault phases to ground (earth) in the Check for continuity from the compressor terminals to cables, or the motor.
  • Page 130 Problem Potential Cause Corrective Action Check the supply voltage and supply currents to the A phase is missing on the frequency converter. supply side, or the mains voltage imbalance is too high. Mains Phase This message also appears for Loss Refer to “Compressor Drive Input/Output (VFD-02)”...

  • Page 131: Compressor Troubleshooting Chart

    Compressor Troubleshooting Chart Problem Potential Cause Corrective Action Use a multi-meter to check the compressor wiring Shorted or broken wires harness for an open or short circuit. Locked rotor Check continuity of the compressor. Replace if failed. Compressor will not start Low voltage Test voltage.

  • Page 132: Airflow Troubleshooting Chart

    Airflow Troubleshooting Chart Problem Potential Cause Corrective Action Replace fuse or reset circuit breaker and Blown fuse/Open circuit breaker check amps. Disconnect switch in “Off” position Turn to “On” position. Verify door is closed properly. Door switch Fan Inoperative Check door switch wiring and switch. Check motor wiring to wiring diagram located Motor wired incorrectly on fan motor.

  • Page 133: Furnace Troubleshooting Chart

    Furnace Troubleshooting Chart Problem Potential Cause Corrective Action Main gas is off Open main gas valve. Shut off valve closed Open shut off valve. ON/OFF gas valve is off Turn ON/OFF gas valve on. Gas pressure out of range Adjust to proper gas pressure. Air in gas line Purge gas line.

  • Page 134: Superheat And Subcooling

    Superheat and Subcooling When determining superheat, use Table 5 to convert the low side pressure gauge (suction line) to the appropriate temperature. Subtract the converted temperature from the suction line surface temperature. There should be approximately a 20°F difference. Superheat monitors what state the refrigerant is when it leaves the evaporator coil.
  • Page 135 Subcooling monitors what state the refrigerant is in when it leaves the condensing coil. High subcooling means the condenser is flooded with liquid refrigerant, stacked on the EEV. Low subcooling means the condenser is starving and operating less efficiently. The subcool measurement represents how much the refrigerant in the condenser is cooled past the saturation point.

  • Page 136: Component Check/Testing

    Component Check/Testing On-board Airflow Sensor 1. Verify the tubing to the on-board sensor is connected. Confirm there are no kinks, cracks, or damage to the tubing. Replace tubing if needed. 2. With the unit ON, set the blower to “Manual” through the HMI. Go to Factory Settings > Unit Options > Blower Config >...
  • Page 137 Clogged Filter Switch (PS-10) 1. The vent tube should be connected to the low side port (Figure 61). A fault will occur when the switch senses a negative pressure. 2. If the “Clogged Filters” fault is active: • Check the filters. If the filters are clogged or damaged, replace as needed. Check for any other obstructions in the unit.
  • Page 138 Low Refrigeration Pressure Switch (SW-15) Figure 62 - Low Refrigeration Pressure Switch 1. For the low pressure switch (Figure 62), insert a back probe tool at connector J36 pin 1 and pin 2. Power the unit ON. Check for voltage at the following pins: •...
  • Page 139 Compressor Drive Input/Output (VFD-02) 1. Power the unit OFF. Verify there is no damage to the wiring. Make sure all connections are secure and connected. Verify wiring connections to the schematic. Refer to Figure 64 for details. 2. Verify the unit is OFF. Check for open or short circuits in the wiring harness. 3.
  • Page 140 Temperature Sensor Intake (SN-01)/Return (SN-02)/Outdoor (SN-03)/Discharge (SN-04)/Space (HUM-2) Refer to Figure 66 component locations. Check the following: 1. Make sure the unit is OFF. 2. Make sure the wires are connected properly. 3. Measure the resistance of the temperature sensor. Use the temperature/ohm chart to determine your readings.
  • Page 141 High Gas Pressure Switch (PS-03) 1. Turn the unit ON. Reset the lever on the switch. Gas pressure must be lower in the chamber for the reset latch to be set properly. Verify the high gas pressure switch is set to 12 in. w.c. 2.
  • Page 142 Vent Proving Switch (PS-01) 1. Verify wiring is connected properly. 2. Check that the vent tubing is routed correctly. Make sure the tube is not pinched or clogged. 3. Verify the bleed hole is not clogged (Figure 69). The bleed hole reduces condensation build-up in the switch and tubing.
  • Page 143 Main (On/Off) Gas Valve (VA-01) Figure 71 - Main Gas Valve The main gas valve (Figure 71) is located in the burner cabinet. Units that use 500MBH and larger furnaces are equipped with two shut-off valves internal to a single body. Main Gas 1.
  • Page 144 Flame Safety Control (FSC-01) The FSC is located in the main control cabinet. 1. Verify wiring and connections are properly connected (Figure 73). 2. Turn the unit ON. Use the HMI to set the unit in test mode. • Service > Test Menu > Test Heating > Run Low Fire Test > Stages All •...
  • Page 145 Intake Damper Motor Assembly (MT-06) 1. Verify the wiring is correct. 2. Check the wiring for open or short circuits. 3. Verify the positive signal from J18 pin 2 is connected to the assembly at pin 3. 4. Verify the negative signal from J18 pin 9 is connected to the assembly at pin 1. 5.
  • Page 146 Hot Gas Reheat Valve (HG-1/HG-2) Figure 75 - Hot Gas Reheat Units with a single reheat valve, HG-1 will be a three-way In-Line Valve Three-Way Valve valve. Units that use dual reheat valves will have HG-1 in- line to the reheat coil inlet and HG-2 in-line to the outdoor (condensing) coil inlet.
  • Page 147 Power Vent (MT-02) 1. If the power vent motor is not operating properly, power the unit OFF. 2. Verify there is no damage to the vent proving switch or vent tube. 3. Verify there is no damage to the wiring, motor or capacitor. Make sure all connections are secure and connected.

  • Page 148: Maintenance

    MAINTENANCE WARNING: DO NOT ATTEMPT MAINTENANCE ON THIS EQUIPMENT UNTIL THE ELECTRICAL SUPPLY HAS BEEN COMPLETELY DISCONNECTED AND THE MAIN GAS SUPPLY VALVE HAS BEEN TURNED OFF. To guarantee trouble-free operation of this unit, the manufacturer suggests following these guidelines. Most problems associated with failures are directly related to poor service and maintenance.

  • Page 149: Heating Season Maintenance

    Heating Season Maintenance • Verify that the drain on the bottom of the flue box in the unit is clear. • Inspect bolts and set screws for tightness. Tighten as necessary. • Inspect the wiring on the unit and replace components where necessary. •...

  • Page 150: Coil Cleaning Procedure

    Coil Cleaning Procedure Do not use a pressure washer or high-water pressure when cleaning the coil. Proper maintenance and cleaning will help preserve the performance of coils and avoid corrosion over the length of the equipment’s life. Equipment exposed to dusty, dirty, or corrosive environments, requires an inspection and cleaning more frequently.

  • Page 151: Filters

    Filters Table 6 - Louvered Intake Filter Quantity Chart (Washable) Unit Housing Size 16” x 20” x 2” 16” x 25” x 2” 20” x 20” x 2” 20” x 25” x 2” Size 1 Size 2 Size 3 Size 4 Unit Housing Size 16”...

  • Page 152: Resetting Unit

    Resetting Unit If the flame safety control is locked out (alarm light on), reset the unit by: 1. Press the FSC Reset push-button, refer to Figure 78. If pressing the reset fails, continue to step 2. 2. Turn OFF power to the unit. 3.
  • Page 153 Notes...
  • Page 154 Notes...

  • Page 155: Start-Up And Maintenance Documentation

    Start-Up and Maintenance Documentation START-UP AND MEASUREMENTS SHOULD BE PERFORMED AFTER THE SYSTEM HAS BEEN AIR BALANCED AND WITH THE COOLING ON (warranty will be void without completion of this form). Job Information Job Name Service Company Address Address City City State State...
  • Page 156 Maintenance Record Date of Visit Field Measured Information – Initial Readings Field Measured Information – Final Readings Motor Voltage Motor Voltage Motor Amperage* Motor Amperage* MUA Blower RPM MUA Blower RPM Ambient Wet Bulb Temp °F/C Ambient Wet Bulb Temp °F/C Ambient Dry Bulb Temp °F/C Ambient Dry Bulb Temp °F/C Cond Suction Pressure psi...

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