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AAON RQ NextGen Series Installation Operation & Maintenance

AAON RQ NextGen Series Installation Operation & Maintenance

Packaged rooftop units, heat pumps, & outdoor air handling units
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Packaged Rooftop Units, Heat Pumps,
Installation, Operation,
UL-60335
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings
exactly could result in serious
injury, death or property damage.
Be 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.
Keep a copy of this IOM with the
unit.
& Outdoor Air Handling Units
& Maintenance
o Do not store gasoline or other flammable
o WHAT TO DO IF YOU SMELL GAS
o Startup and service must be performed by a
RQ NextGen
WARNING
vapors and liquids in the vicinity of this or any
other appliance
 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.
Factory Trained Service Technician.
SERIES

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Summary of Contents for AAON RQ NextGen Series

  • Page 1 RQ NextGen SERIES Packaged Rooftop Units, Heat Pumps, & Outdoor Air Handling Units Installation, Operation, & Maintenance UL-60335 WARNING WARNING o Do not store gasoline or other flammable FIRE OR EXPLOSION HAZARD vapors and liquids in the vicinity of this or any other appliance Failure to follow safety warnings exactly could result in serious...

  • Page 3: Table Of Contents

    Table of Contents ® AAON RQ Series Features and Options Introduction ..............7 Safety .............................. 8 RQ Series Unified Feature String Nomenclature ..............14 General Information ........................22 Codes and Ordinances ......................22 Receiving Unit .......................... 23 Storage ............................24 Wiring Diagrams ........................
  • Page 4 E-Coated Coil Cleaning ......................56 Microchannel Coil Cleaning ..................... 57 Options ............................59 Heating Coils ..........................59 Chilled Water Coil ........................59 Packaged Direct Expansion (DX) Units ................... 60 Variable Capacity Compressor Controller ................61 Evaporator Coil ......................... 63 Condenser Fan .......................... 63 Refrigerant-to-Water Heat Exchanger ..................
  • Page 5 Index of Tables and Figures Tables: Table 1 - Unit Clearances ......................24 Table 2 - Nameplate Voltage Markings & Tolerances ..............34 Table 3 – 35 KAIC Fuse Sizing ....................36 Table 4 – 65 KAIC Fuse Sizing ....................36 Table 5 - Single Circuited Variable Speed Compressor Frequency Range ........
  • Page 6 Figures: Figure 1 - Lockable Handle ......................23 Figure 2 - RQ Series Orientation ....................25 Figure 3 - RQ Cabinet Standard and Power Exhaust Gasket Locations ........26 Figure 4 - Forklifting an RQ Series Unit from the Side ............... 27 Figure 5 - Forklifting an RQ Series Unit from the Front ..............

  • Page 7: Aaon ® Rq Series Features And Options Introduction

    AAON ® RQ Series Features and Options Introduction Energy Efficiency Direct Drive Backward Curved Plenum • Installation and Maintenance Supply Fans Clogged Filter Switch • Two-Stage, Variable Capacity and • Color Coded Wiring Diagram • Variable Speed R-410A Scroll Compressors in Isolated Compartment •...

  • Page 8: Safety

    Safety Attention must be paid to the following statements: NOTE - Notes are intended to clarify the unit installation, operation and maintenance. CAUTION - Caution statements are given to prevent actions that may result in equipment damage, property damage, or personal injury. WARNING - Warning statements are given to prevent actions that could result in equipment damage, property damage, personal injury or death.
  • Page 9 WARNING WARNING FIRE, EXPLOSION OR CARBON ROTATING COMPONENTS MONOXIDE POISONING HAZARD Unit contains fans with moving parts Failure to replace proper controls that can cause serious injury. Do not could result in fire, explosion or open door containing fans until the carbon monoxide poisoning.
  • Page 10 WARNING WARNING During installation, testing, servicing UNIT HANDLING and troubleshooting of the equipment it may be necessary to work with live To prevent injury or death lifting electrical components. Only equipment capacity must exceed unit qualified licensed electrician weight by an adequate safety factor. individual properly trained in handling Always test-lift unit not more than 24 live...
  • Page 11 WARNING WARNING WATER PRESSURE Some chemical coil cleaning compounds are caustic or toxic. Use Prior to connection of condensing these substances only in accordance water supply, verify water pressure is with manufacturer’s usage less than maximum pressure shown instructions. Failure follow on unit nameplate.
  • Page 12 Failure of the condenser as a result of overload settings. These are set by chemical corrosion is excluded from the AAON factory for the protection of coverage under AAON Inc. warranties these motors/compressors and must heat exchanger not be adjusted over this factory manufacturer’s warranties.
  • Page 13 1. Startup and service must be performed by 8. Every unit has a unique equipment a Factory Trained Service Technician. nameplate with electrical, operational, and unit clearance specifications. Always 2. Use only with type of the gas approved refer to the unit nameplate for specific for the furnace.

  • Page 14: Rq Series Unified Feature String Nomenclature

    RQ Series Unified Feature String Nomenclature A - 0 0 0 0 0 : 0 1 - 0 A G 0 K - E 0 0 - 0 0 0 0 0 - 0 0 0 0 0 - C A - 0 0 0 0 RQ A - 030 - C - 0 - 3 - C A B 0 - 0 0 - 0 0 - 0 - 0 0 0 - 0 0 - B A 0 B - 0 0 - 0 0 0 - A 0 0 0 0 0 - C 0 0 0 0 0 - 0 0 0 0 0 0 B BASE MODEL...
  • Page 15 RQ Series Unified Feature String Nomenclature : 0 1 - 0 A G 0 K - E 0 0 - 0 0 0 0 0 - 0 0 0 0 0 - C A - 0 0 0 0 A - 0 0 0 0 0 RQ A - 030 - C - 0 - 3 - C A B 0 - 0 0 - 0 0 - 0 - 0 0 0 - 0 0 - B A 0 B - 0 0 - 0 0 0 - A 0 0 0 0 0 - C 0 0 0 0 0 - 0 0 0 0 0 0 B...
  • Page 16 RQ Series Unified Feature String Nomenclature 0 : 0 1 - 0 A G 0 K - E 0 0 RQ A - 030 - C - 0 - 3 - C A B 0 A - 0 0 0 0 - 0 0 0 0 0 - 0 0 0 0 0 - C A - 0 0 0 0 - 0 0 - 0 0 - 0 - 0 0 0 - 0 0 - B A 0 B - 0 0 - 0 0 0 - A 0 0 0 0 0 - C 0 0 0 0 0 - 0 0 0 0 0 0 B B5: HEAT PUMP AUXILIARY HEATING...
  • Page 17 RQ Series Unified Feature String Nomenclature - 030 - C - 0 - 3 - C A B 0 A - 0 0 0 0 0 : 0 1 - 0 A G 0 K - E 0 0 - 0 0 0 0 0 - 0 0 0 0 0 - C A - 0 0 RQ A - 0 0 - 0 0 - 0 - 0 0 0 - 0 0 - B A 0 B - 0 0 - 0 0 0 - A 0 0 0 0 0 - C 0 0 0 0 0 - 0 0 0 0 0 0 B...
  • Page 18 RQ Series Unified Feature String Nomenclature - 030 - C - 0 - 3 - C A B 0 A - 0 0 0 0 0 : 0 1 - 0 A G 0 K - E 0 0 - 0 0 0 0 0 - 0 0 0 0 0 - C A - 0 0 RQ A 0 0 - 0 0 - 0 - 0 0 0 - 0 0 - B A 0 B - 0 0 - 0 0 0 - A 0 0 0 0 0 - C 0 0 0 0 0 - 0 0 0 0 0 0 B...
  • Page 19 0 = None 16B: CONTROL SUPPLIER A = Base Insulation 0 = None B = SA & RA Burglar Bars A = AAON Controls F = Option A + B 16C: CONTROL SUPPLIER OPTIONS 21: ACCESSORIES 0 = None 0 = None...
  • Page 20 RQ Series Unified Feature String Nomenclature - 030 - C - 0 - 3 - C A B 0 A - 0 0 0 0 0 : 0 1 - 0 A G 0 K - E 0 0 - 0 0 0 0 0 - 0 0 0 0 0 - C A - 0 0 0 0 RQ A 0 0 0 - C 0 0 0 0 0 - 0 0 0 0 0 - 0 0 - 0 0 - 0 - 0 0 0 - 0 0 - B A 0 B - 0 0 - 0 0 0 - A 0 0...
  • Page 21 0 = Galvanized Cabinet - Double Wall + R-13 Foam Insulation 37: SPECIALS & PAINT B = Premium AAON Gray Paint Exterior Paint C = Premium AAON Gray Paint Exterior Paint + Interior Corrosion Protection E = Premium Gray Paint Exterior Paint + Shrink Wrap...

  • Page 22: General Information

    Safety Standard 1995 5 Edition/CSA C22.2 as specified per test standard ANSI 21.47. No. 236, ANSI, UL-60335-2-40 4 Edition, All gas heat exchangers used in AAON Safety Standard Z21.47b-2008/CSA 2.3b- appliances certified 2008, and ANSI Safety Standard Z83.8- downstream of evaporator or cooling 2006/CSA 2.6-2006.

  • Page 23: Receiving Unit

    Failure to observe the following instructions will result in premature The warranty card must be completed in full failure of your system and possible and returned to AAON not more than 3 voiding of the warranty. months after unit is delivered.

  • Page 24: Storage

    Installation equipment. Unit must also be installed so that AAON equipment has been designed for the flow of combustion intake air is not quick and easy installation. obstructed from reaching the furnace.

  • Page 25: Setting The Curb

    Be careful to install the provided neoprene isolator according to Figure 3 prior to setting the unit on the curb. Right Side CAUTION Neoprene isolator for unit vibration isolation is provided in the cabinet and Back must be installed according to installation Front manual.

  • Page 26: Figure 3 - Rq Cabinet Standard And Power Exhaust Gasket Locations

    Figure 3 - RQ Cabinet Standard and Power Exhaust Gasket Locations...

  • Page 27: Forklifting The Unit

    through to the opposite side of the unit. When CAUTION lifting from the end of the unit, the forks must extend at least 112 cm (44”) under the unit. Improper lifting can cause damage to When lifting with 122 (48”) forks, the back the unit.

  • Page 28: Lifting The Unit

    Lifting the Unit position. However, the unit may be lifted The RQ Series units must be lifted using the with the outside air hood in the open position. lifting points in the side base rails. spreader bar must be used to prevent the Before lifting unit, be sure that all shipping lifting straps from damaging the unit.

  • Page 29: Vertical Duct Connection

    Vertical Duct Connection CAUTION Note: If outside air will be in contact with the air tunnel base the unit must include the base Do not drill or punch holes in the base insulation option or the base must be field of the unit, from inside the unit or from insulated.

  • Page 30: Seismic Curb Installation

    All mounting details listed must be followed to Structural engineer of record must approve achieve seismic certification. The AAON building anchorage to unit or curb in unit must be certified to ICC-ES AC156 compliance with OSP-0180-10. Use provided...

  • Page 31: Figure 10 - Seismic Solid Bottom Curb Without Filters Cross Section

    Figure 10 - Seismic Solid Bottom Curb without Filters Cross Section Figure 11 - Seismic Solid Bottom Curb without Filters Detail A Figure 12 - Seismic Solid Bottom Curb without Filters Detail B...

  • Page 32: Horizontal Duct Connection

    Figure 13 - Seismic Rigid Mount Curb Cross Section Horizontal Duct Connection Outside Air Rain Hood Note: If outside air will be in contact with the Rain hood must be opened before startup of air tunnel base the unit must include the base the unit.

  • Page 33: Metal Mesh Filters

    Figure 16 - RQ Series unit Open Rain Hood Figure 15 - RQ Series unit Closed Rain Hood Metal Mesh Filters Clips that hold the metal mesh filters in the Metal mesh outside air filters require filter rack must face outward. installation of the filter rack on the intake of the rain hood.

  • Page 34: Electrical

    Electrical Verify the unit nameplate agrees with power supply. Connect power and control wiring to the unit as shown in Figure 19 and in the unit specific wiring diagram, which shows factory and field wiring and is attached to the inside of the door of the control compartment. Table 2 - Nameplate Voltage Markings &...

  • Page 35: Figure 19 - Back View Of Power Switch From Control Compartment

    Field Connection Location Utility Entry Figure 19 - Back View of Power Switch from Control Compartment Size supply conductors based on the unit Wire power leads to the unit’s terminal block MCA rating. Supply conductors must be or main disconnect. All wiring beyond this rated a minimum of 75°C (167°F).

  • Page 36: Variable Speed Compressors

    Three phase voltage imbalance will cause CAUTION motor overheating and premature failure. The maximum allowable imbalance is 2%. Scroll compressors are directional and will be damaged by operation in Voltage imbalance is defined as 100 times the the wrong direction. Low pressure maximum deviation from the average voltage switches on compressors have been divided by the average voltage.

  • Page 37: Thermostat Control Wiring

    Example: Variable Speed Compressor Supplement (V83980). A total of 8 wires must be pulled 75ft to control the unit. What size wire must be Table 5 - Single Circuited Variable Speed used? Compressor Frequency Range According to the Table 4, 16 AWG allows for Compressor Range Model (RQ) 63ft (500 ft/8 wires) and 14 AWG allows for...

  • Page 38: Draw-Through Coils

    dimension. This ensures that enough water CAUTION is stored in the trap to prevent losing the drain seal during unit startup Unit must not be operated without a p- trap. Failure to install a p-trap may Note: The absolute value of the fan inlet result in overflow of condensate water pressure will always be greater than or equal into the unit.

  • Page 39: Non-Compressorized Liquid And Suction Line Piping

    Non-Compressorized Liquid and Suction for the liquid line (Figure 20 and Figure 21). Line Piping For pipe sizing, refer to appropriate There are two different locations to pipe out guidelines in the condenser or condensing of the unit, the post corner hole location and unit installation manual.

  • Page 40: Figure 22 - Post Corner Hole Piping

    Figure 23 - Post Corner Hole Piping Figure 24 - Post Back Hole Piping...

  • Page 41: Startup

    Startup During startup, it is necessary to perform routine checks on the performance of the unit. (See back of the manual for startup form.) This includes checking the air flow, air filters, condenser water flow, dampers, WARNING heaters, and refrigerant charge. Filters Improper installation,...

  • Page 42: Supply Fan Ec Motor Startup

    Speed adjustment is made by varying the DC adjusting the potentiometer from 0-100% you voltage on pin 8 (+) & 16 (-). If AAON Orion can manually adjust the speed of the motor. Control systems are installed on the system,...

  • Page 43: Adjusting Refrigerant Charge

    If the following troubleshooting suggestions adjustments. do not solve the issue, contact AAON for assistance. The type of unit and options determine the ranges for liquid sub-cooling and evaporator Adjusting Refrigerant Charge superheat. Refer to Table 7 and Table 8...

  • Page 44: Checking Evaporator Superheat

    Subtract the measured liquid line temperature Table 9 - Acceptable Refrigeration Circuit from the saturated temperature to determine Values (Metric) the liquid sub-cooling. Air-Cooled Cond./Air-Source Heat Pump In Cooling Mode Compare calculated sub-cooling to Table 7 Sub-Cooling 4.4-8.3°C / 1.1-2.2°C and Table 8 for the appropriate unit type and (HP)* options.

  • Page 45: Adjusting Sub-Cooling And Superheat Temperatures

    Table 12 - Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub-Cooling Values (Imperial) Cooling Mode Liquid Sub-Cooling Values(°F) Evaporator Coil Saturation Temperature (°F) Ambient (°F) 9 - 14 8 - 13 8 - 13 7 - 12 5 - 10 10 - 15 9 - 14 9 - 14 8 - 13...

  • Page 46: Table 13 - R-410A Refrigerant Temperature-Pressure Chart (Metric)

    Table 13 - R-410A Refrigerant Temperature-Pressure Chart (Metric) °F °F °F °F °F PSIG PSIG PSIG PSIG PSIG 78.3 134.7 213.7 321.0 463.2 80.0 137.2 217.1 325.6 469.3 81.8 139.7 220.6 330.2 475.4 83.6 142.2 224.1 334.9 481.6 85.4 144.8 227.7 339.6 487.8...

  • Page 47: Table 14 - R-410A Refrigerant Temperature-Pressure Chart (Imperial)

    Table 14 - R-410A Refrigerant Temperature-Pressure Chart (Imperial) °F °F °F °F °F PSIG PSIG PSIG PSIG PSIG 78.3 134.7 213.7 321.0 463.2 80.0 137.2 217.1 325.6 469.3 81.8 139.7 220.6 330.2 475.4 83.6 142.2 224.1 334.9 481.6 85.4 144.8 227.7 339.6 487.8...

  • Page 48: Table 15 - R-454B Refrigerant Temperature-Pressure Chart (Metric)

    Table 15 - R-454B Refrigerant Temperature-Pressure Chart (Metric) °C °C °C °C °C 1348.0 38.3 2034.6 -6.7 484.5 843.3 23.3 53.3 2946.9 1370.0 38.9 2064.1 -6.1 23.9 53.9 495.6 859.3 2985.7 1392.2 39.4 2093.9 -5.6 506.9 875.3 24.4 54.4 3024.9 1414.6 40.0 2123.9 55.0 -5.0...

  • Page 49: Table 16 - R-454B Refrigerant Temperature-Pressure Chart (Imperial)

    Table 16 - R-454B Refrigerant Temperature-Pressure Chart (Imperial) °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG 70.3 122.3 195.5 295.1 427.4 71.9 124.6 198.7 299.4 433.0 73.5 127.0 201.9 303.7 438.7 75.2 129.3 205.2 308.0 444.5 76.8 131.7 208.5 312.5 450.3...

  • Page 50: Freeze Stat Startup

    Table 17. coils resulting in elevated compressor discharge pressure. AAON Condenser Head Pressure Module is used for variable speed control of the motor to maintain a head pressure. The motor must Freeze Stat Startup...

  • Page 51: Adjustable Fan Cycling Switch Procedure

    Adjustable Fan Cycling Switch Procedure Recommended Settings The switch will come factory set to cut-in at 2.93 Mpa [425psi] (+/– 5psi) and a differential of 1.69 Mpa [155psi] (or open at 1.86 Mpa [270psi] (+/– 5psi)). Note: 5 psi = 34.5 kpa To adjust the fan cycle switch you will need a flathead screwdriver.
  • Page 52 Cut In Gauge Cut In Gauge To lower the pressure set point for the CUT To raise the pressure set point for the CUT IN IN gauge, turn the adjustable screw gauge, turn the adjustable screw counter clockwise. clockwise. Differential Differential Gauge Gauge...

  • Page 53: Operation

    Packaged DX Cooling Operation and Operation Control When a call for cooling (G and Y1, Y2, etc.) is made the supply blower motors and Unit operations must be controlled with compressors will energize. thermostat, or unit controller, never at the main power supply, except for servicing, emergency, or complete shutdown of the WARNING...

  • Page 54: Electric Heating Operation

    On a fault the gas train is shut down by a main Supply Fan limit located in the heat exchanger area or by WARNING an auxiliary limit mounted in the supply fan compartment. Electric shock hazard. Shut off all electrical power to the unit to avoid Electric Heating Operation shock hazard or injury from rotating When a call for heating (G and W1, W2, etc.)

  • Page 55: Dx Cooling

    Remove fan access panel on the back side of Through the coil access door, remove the two the unit. Panel is attached with eight 8 mm 8 mm (5/16”) bolts that connect the blower (5/16”) bolts. assembly to the inlet wall from air entering side of the wall (see Figure 26).

  • Page 56: E-Coated Coil Cleaning

    E-Coated Coil Cleaning CAUTION Documented routine cleaning of e-coated coils is required to maintain coating warranty coverage for fin and tube and microchannel High velocity water from a pressure coils. E-Coated Coil Maintenance Record washer or compressed air must only sheets are provided in the appendix.

  • Page 57: Microchannel Coil Cleaning

    Enviro-Coil Cleaner: AAON PN: V82540 rinse the coils and continue to always work in sections/panels. GulfClean ™ Coil Cleaner ; AAON PN: G074480 Continue until all coil areas on the inside of the unit have been rinsed. Note: Coils must...
  • Page 58 4. Rinse the coil with water as in step one. These chemicals have been tested for 5. Repeat as necessary. performance and safety and are the only chemicals that AAON will warrant as correct #2 Water Flush for cleaning microchannel coils. This procedure can be used when the only...

  • Page 59: Options

    All valve controls for heating operation are warranty. field supplied and field installed. Hot water and steam coil connections are spun copper AAON testing has determined that unless a tube. chemical has a neutral pH (6-8) it must not be used.

  • Page 60: Packaged Direct Expansion (Dx) Units

    Table 20 - Chilled Water Coil Connection refrigeration system factory Sizes assembled, leak tested, charged with refrigerant and run tested. Chilled Water Coil Model (RQ-) Connection Size [mm (in.)] Refrigerant system includes an evaporator, 002-006 29 (1 1/8) condenser, liquid line filter drier, thermal Table 21 –...

  • Page 61: Variable Capacity Compressor Controller

    accumulation out of the compressor before it Variable Capacity Compressor Controller is started. Always control the unit from the thermostat, Units with variable capacity scroll or control panel, never at the main power compressors may include the following supply, except for servicing, emergency or compressor controller.

  • Page 62: Table 22 - Demand Signal Vs. Compressor Capacity Modulation

    T1 & T2 Discharge Temperature The compressor controller modulates the Sensor compressor unloader solenoid in an on/off pattern according to the capacity demand High Voltage Terminals signal of the system. The following table A1 & A2 Alarm Relay Out shows the linear relationship between the M1 &...

  • Page 63: Evaporator Coil

    Evaporator Coil Reinstallation Slide the new coil into the unit through the WARNING notch cut in the front of the drain pan. Electric shock hazard. Shut off all Re-bend the cut flange back to the original electrical power to the unit to avoid position, then seal the cuts with polyurethane shock hazard or injury from rotating caulking.

  • Page 64: Refrigerant-To-Water Heat Exchanger

    Reconnect wires, then attach the fan grill at all the points where screws were removed. Failure of the condenser as a result of chemical corrosion is excluded from coverage under AAON Inc. warranties Refrigerant-to-Water Heat Exchanger heat exchanger Condenser water pump, condenser water manufacturer’s warranties.

  • Page 65: Freezing Water In The Heat Exchanger

    A coverage under AAON warranties and the refrigerant-to-water heat exchanger contains heat exchanger manufacturer warranties. refrigerant in one passage and water in another passage. Water is subject to freezing Failure of the condenser will allow water to at 0°C (32°F).

  • Page 66: Water Piping

    Glycol solution must be used if ambient WARNING temperatures are expected to fall below freezing or if the loop entering water WATER PRESSURE temperature to the unit is below 10°C (50°F) while operating in the heating mode (heat Prior to connection of condensing pump units only).
  • Page 67 tower/geothermal loop and self-contained (muriatic acid) or chlorine as it will corrode unit. System must be sized in accordance stainless steel. with ASHRAE Handbook. engineering guidelines to maintain equal CAUTION distances for supply and return piping and limit bend radii to maintain balance in the system.

  • Page 68: Energy Recovery Units

    Piping systems must not exceed 3.1 m/s (10 ft/sec) fluid velocity to ensure tube wall integrity and reduce noise. Energy Recovery Units WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Startup and service must be performed by a Factory Trained Service Technician.
  • Page 69 Wiring diagrams are provided with each motor. When wired according to wiring diagram, energy recovery wheel rotates clockwise when viewed from the shaft/pulley side. By carefully reviewing the information within this section and following the instructions, the risk of improper operation and/or component damage...
  • Page 70 Confirm that the wheel rotates freely. Apply (“feeler gauge”) between the seal and the power to the unit and confirm rotation. media a multiple locations along the purge Visually inspect the belt and ensure the belt seal as you rotate the wheel slowly by hand is tracking near the center of the rim.

  • Page 71: Energy Recovery Wheel General Cleaning

    maintenance information for the specific Energy Recovery Wheel General Cleaning controls, then contact your sales Cleaning the energy transfer media will help representative, or the control manufacturer maintain optimal performance. for assistance. frequency of cleaning is largely dependent on the application and air quality.
  • Page 72 Class of Air Examples Cleaning Frequency • Offices Class 1 • Classrooms Every 8-10 years Clean Air • Assembly rooms • Churches • Restrooms • Swimming pools Class 2 • Dining rooms Moderately Clean Every 4-6 years • Locker rooms •...
  • Page 73 CAUTION Do not use acid based cleaners, aromatic solvents, steam temperatures in excess of 76.7°C (170°F)damage to the wheel may occur! WARNING: Monolithic wheels with internal bearings must not be soaked to avoid corroding bearing. (Note: some staining of the desiccant may Diameter Seal Adjustment remain and is not harmful to performance).
  • Page 74 Accessibility Operation The cassette and all its operative parts; i.e.: CAUTION motor, belt, pulley, bearings, seals and energy transfer segments must be accessible Keep hands away from rotating wheel! for service and maintenance. This design Contact with rotating wheel can cause requires that adequate clearance be provided physical injury.
  • Page 75 4. Remove the beam. 5. Remove the two hub cover screws 6. Remove center screw from the end of the wheel shaft 7. Remove the belt from the wheel Hub Seal Adjustment 8. Remove the wheel from the frame. 9. To install the wheel, complete the Service previous 8 steps in reverse order.
  • Page 76 Belt Replacement 7. Install the belts around the wheel and 1. Obtain access to the pulley side pulley according to the instructions bearing access plate if bearing access provided with the belt. plates are provided. Remove two 8. Reinstall diameter seals or hub seal bearing access plate retaining screws and tighten retaining screws.

  • Page 77: Gas Or Electric Heating

    Gas or Electric Heating If overheating occurs with a gas heat The unit is designed to heat a given amount exchanger, or the gas supply fail to shut off, of air while operating. If this amount of air is shut off the manual gas valve to the furnace greatly reduced, approximately 1/3 during before shutting off the electrical supply.

  • Page 78: Electric Preheat

    Electric Preheat Flash Code LED Screen Controller Buttons Figure 33 - Preheat Controller The electric preheat controller is factory 3. LATset - Leaving air temperature (°F) installed within the preheat cabinet. The control setpoint. following details are for EHC1 version 1.10 of the preheat controller.

  • Page 79: System Setting Screens

    6. LLTset - “Low Limit Time” temperature System Setting Screens (°F) setpoint. If this temperature is not These screens are access by pressing the up reached at full output, relay will pull in. button and then entering the technician password 2425. The screens are scrolled through by pressing either right or left buttons on the controller.

  • Page 80: Led Flash Alarm Codes

    4. LATset - Leaving air temperature LED Flash Alarm Codes setpoint. Range = 35°F-80°F, and the The flashing red LED will be to the right of default is 50°F. the screen. The number of blinks is described below. The LCD screen will also display the screens.

  • Page 81: Operation

    9 = Short or overload on the 0-10VDC controlled and staged electric preheat. Both analog signal output setpoints are set with push button LCD interface on the preheat controller. Outside air temperature sensors and preheat discharge supply air temperature sensors are factory installed and wired to the preheat controller.

  • Page 82: Table 28: 2-6 Ton Gas Connections

    time the gas flow rate through the Table 28: 2-6 ton Gas Connections gas meter with a stopwatch to verify the gas input rate. Cabinet Capacity Valve Valve Staging Valve Unit nameplate input rate value has Size 1 Size 2 Size (MBH) been calculated at the altitude where 1, 2, MOD...

  • Page 83: Piping Sizing Examples

    Table 31 – (Metric) Propane (kW) Maximum Piping Capacities Specific Gravity = 1.52, Supply Pressure = 2.34 kpa., Pressure Drop, 0.93 mmHg Length of Pipe Pipe Size (mm) 6.1 m 15.2 m 30.4 m 45.6 m 60.8 m 12.7 25.4 31.75 438.1 266.7...

  • Page 84: Gas Pressure Regulator & Overpressure Protection Device

    for natural gas, or 19.6 mmHg (10.5” w.c.) heater operation, pressure to the regulator for propane.. SHALL NOT be greater than 34.5 kpa (5 psi) (258.57 mmHg [138.4” w.c.]). For two stage gas valves, the low stage setting shall be set at 2.1 mmHg (1.1” w.c.) Piping Supports for natural gas, 9.34 mmHg (5.0”...
  • Page 85 It must be determined by a qualified technician if the condensate will damage the AAON gas fired heat exchangers are roofing material before unit startup. designed to be non-condensing. These heat exchangers are mounted downstream of the Below freezing ambient air temperatures cooling coils.

  • Page 86: Figure 34 - Example 2-6 Ton Through The Base Gas Piping Note: Rq Units Will Only Contain One Heat Exchanger

    Figure 35 - Example 2-6 ton through the Base Gas Piping Note: RQ units will only contain one Heat Exchanger...

  • Page 87: Leak Testing

    Leak Testing All components of gas supply system, DANGER including manual shut off valves and the piping in the interior of the unit, must be leak Do not use open flame or other source tested. At a minimum, the “Bubble Leak of ignition for leak testing.

  • Page 88: Gas Heater Operating Instructions

    Gas Heater Operating Instructions Figure 36 - Gas Heater Instructions...

  • Page 89: Gas Heating Maintenance

    AAON service representative. The combustion ventilation motor must operate. The control will automatically If induced draft blower/motor assembly has...

  • Page 90: Gas Heat Exchanger Removal

    Gas Heat Exchanger Removal DANGER WARNING LEAK CHECK GAS PIPE Electric shock hazard. Shut off all The gas pipe in the unit must be electrical power to the unit to avoid checked for leaks before operation shock hazard or injury from rotating and startup.

  • Page 91: Phase And Brownout Protection Module

    Phase and Brownout Protection Module To change the setpoint parameters use the right arrow key to advance forward through the setpoint parameters and the left arrow to backup if needed. When each parameter is displayed use the up/down keys to change and set the parameter.
  • Page 92 Screens Manufacturer’s Screen R-K Electronics DPM v0.0.00 Average Voltage Screen VAvg Default – the default screen shows the real time voltage detected in each of the 3 phases: A-B B-C C-A Voltage Selection Screen (Vertical Format) Default = 460V, 3Ø 200, 1Ø;...

  • Page 93: Filter Replacement

    Filter Replacement Monthly air filter inspection is required to It is strongly recommended that filter media maintain optimum unit efficiency. be replaced monthly. Filters are located upstream of the evaporator coil in the filter and economizer section. Open access door WARNING and pull filters straight out to inspect all of the filters.

  • Page 94: Replacement Parts

    [61 x 30.5 x 5.1] [24 x 24 x 2] [61 x 61 x 5.1] Replacement Parts Parts for AAON equipment may be obtained from your local AAON representative. Reference the unit serial number and part number when ordering parts.

  • Page 97: Appendix A - Heat Exchanger Corrosion Resistance

    Appendix A - Heat Exchanger Corrosion Resistance The resistance guide provides the corrosion resistance of stainless steel type AISI 316 and pure Copper (99.9%) in water, to a number of important chemical factors. The actual corrosion is a very complex process influenced by many different factors in combination. Explanations: + Good resistance under normal conditions 0 Corrosion problems may occur especially when more factors are valued 0 - Use is not recommended...
  • Page 98 Water Concentration Time Limits - AISI Copper Nickel Containing (mg/l or ppm) Analyze Before Alloy Alloy Total Hardness 4.0-8.5 No Limit (°dH) < 100 Nitrate (NO No Limit > 100 < 0.2 Iron (Fe) No Limit > 0.2 < 0.2 Aluminum (Al) No Limit >...

  • Page 99: Appendix B - Thermistor Temperature Vs. Resistance Values

    Appendix B - Thermistor Temperature vs. Resistance Values Deg C Deg F Resistance (kOhms) Deg C Deg F Resistance (kOhms) 2889.6 15.07 2087.22 12.73 1522.20 10.79 1121.44 9.20 834.72 7.87 627.28 6.77 475.74 5.85 363.99 5.09 280.82 4.45 218.41 3.87 171.17 3.35 135.14...

  • Page 100: Rq Series Startup Form

    RQ Series Startup Form Job Name:____________________________________________ Date:______________ Address:___________________________________________________________________ ___________________________________________________________________________ Model Number:_______________________________________________________________ Serial Number:___________________________________________ Tag:______________ Startup Contractor:____________________________________________________________ Contractor Address:___________________________________________________________ ______________________________________________________ Phone:____________ Pre Startup Checklist Installing contractor must verify the following items. 1. Is there any visible shipping damage? 2. Is the unit level? 3.
  • Page 101 Supply Fan Assembly Alignment Check Rotation Nameplate Amps________ Number L1 Volts/Amps L2 Volts/Amps L3 Volts/Amps Band Size_____________________ VAV Controls_________________ VFD Frequency________________ Energy Recovery Wheel Assembly Wheel Spins Freely Check Rotation FLA ________ Number L1 Volts/Amps L2 Volts/Amps L3 Volts/Amps Power Exhaust Fan Assembly Alignment Check Rotation Nameplate Amps________...
  • Page 102 Compressors/DX Cooling Check Rotation Head Suction Number Pressure Pressure Volts/Amps Volts/Amps Volts/Amps PSIG PSIG 1 - Full Capacity 1 - Reduced Capacity Refrigeration System 1 Full Capacity - Cooling Mode Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Refrigeration System 1 Reduced Capacity - Cooling Mode Saturated Line...
  • Page 103 Water/Glycol System 1. Has the entire system been flushed and pressure checked? 2. Has the entire system been filled with fluid? 3. Has air been bled from the heat exchangers and piping? 4. Is the glycol the proper type and concentration (N/A if water)? 5.

  • Page 104: Maintenance Log

    This log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. AAON Service and Warranty Departments are available to advise and provide phone help for proper operation and replacement parts.

  • Page 105: Maintenance Log (E-Coated Coil)

    Maintenance Log (E-Coated Coil)

  • Page 106: Literature Change History

    Added Enviro-Coil cleaner to E-coating cleaning section. June 2021 Reorganized the sections. Added the AAON PBO. Updated the Acceptable Refrigeration Circuit Values table and added the Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub- Cooling Values table. Added a note about drain pan connections are 1” MPT fitting.

  • Page 108: G149150 · Rev. A · 231127

    Parts: For replacement parts please contact your local AAON Representative. It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.

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