Carrier WeatherMaster 48HC14 Installation Instructions Manual
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Carrier WeatherMaster 48HC14 Installation Instructions Manual

Carrier WeatherMaster 48HC14 Installation Instructions Manual

Single package rooftop gas heat/electric cooling unit with puron (r-410a) refrigerant
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Single Package Rooftop Gas Heat/Electric Cooling Unit
48HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of
2018.
48HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor
fan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable
Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and
Troubleshooting manual.
CONTENTS
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . 1-6
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . ..2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-65
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 6
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 7
Step 5 - Field Fabricate Ductwork. . . . . . . . . . . . . . . 9
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 9
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . 11
Step 9 - Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 13
Step 10 - Install Gas Piping . . . . . . . . . . . . . . . . . . . 13
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
®
®
Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . 39
EconoMi$er X - Ultra Low Leak Economizer
(Factory Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
RTU Open Control System . . . . . . . . . . . . . . . . . . . . . . 54
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Communication Wiring - Protocols . . . . . . . . . . . . 60
Local Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . . . 62
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Step 14 - Install Accessories. . . . . . . . . . . . . . . . . . . 64
Step 15 - Check Belt Tension . . . . . . . . . . . . . . . . . . 64
Pre-Start and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1, CL-2
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480178-01
Installation Instructions
Page
Printed in U.S.A.
Form 48HC-14-03SI
®
with Puron
(R-410A) Refrigerant

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, main-
tenance, or use can cause explosion, fire, electrical shock or
other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The quali-
fied installer or agency must use factory-authorized kits or ac-
cessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and have a
fire extinguisher available. Read these instructions thoroughly
and follow all warnings or cautions attached to the unit. Con-
sult local building codes and appropriate national electrical
codes (in USA, ANSI/NFPA 70, National Electrical Code
(NEC); in Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the
safety-alert symbol
. When you see this symbol on the unit
and in instructions or manuals, be alert to the potential for per-
sonal injury.
Understand the signal words DANGER, WARNING, CAU-
TION, and NOTE. These words are used with the safety-alert
symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signi-
fies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices, which may re-
sult in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when leak testing at pres-
sure greater than 0.5 psig (3450 Pa). Pressures greater than
0.5 psig (3450 Pa) will cause gas valve damage resulting in
hazardous condition. If gas valve is subjected to pressure
greater than 0.5 psig (3450 Pa), it must be replaced before
use. When pressure testing field-supplied gas piping at
pressures of 0.5 psig (3450 Pa) or less, a unit connected to
such piping must be isolated by closing the manual gas
valve.
Pg 1
3-18
WeatherMaster
48HC14
WARNING
Replaces: 48HC-14-02SI
®

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  • Page 1: Table Of Contents

    Puron (R-410A) Refrigerant Installation Instructions 48HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of 2018.

  • Page 2: Rated Indoor Airflow (Cfm)

    WARNING CAUTION ELECTRICAL SHOCK HAZARD CUT HAZARD Failure to follow this warning could cause personal injury Failure to follow this caution may result in personal injury. or death. Sheet metal parts may have sharp edges or burrs. Use care Before performing service or maintenance operations on and wear appropriate protective clothing, safety glasses and unit, always turn off main power switch to unit and install gloves when handling parts and servicing air-conditioning...
  • Page 3 Position: 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Factory Assigned 48 - Gas Heat Packaged Rooftop 0 = Standard 1 = LTL Model Series - WeatherMaster HC - High Efficiency Electrical Options A = None B = HACR Breaker Heat Options C = Non-Fused Disconnect...
  • Page 4 Fig. 2 — Unit Dimensional Drawing — 14 Size Unit...
  • Page 5 Fig. 2 — Unit Dimensional Drawing — 14 Size Unit (cont)

  • Page 6: Installation

    LOCATION DIMENSION CONDITION 48-in. (1219 mm) Unit disconnect is mounted on panel 18-in. (457 mm) No disconnect, convenience outlet option 18-in. (457) mm Recommended service clearance 12-in. (305 mm) Minimum clearance 42-in. (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall) 36-in.

  • Page 7: Step 3 - Inspect Unit

    CURB-MOUNTED INSTALLATION Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate Install curb agree with power supply provided. Install field-fabricated ductwork inside curb On units with hinged panel option, check to be sure all Install accessory thru-base service connection package (af- latches are snug and in closed position.
  • Page 8 Fig. 4 — Roof Curb Details...

  • Page 9: Step 5 - Field Fabricate Ductwork

    Step 5 — Field Fabricate Ductwork NOTE: Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg (112 Pa) without economizer. For vertical ducted applications, secure all ducts to roof curb and building structure.
  • Page 10 PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING UNIT ON ROOF CURB. 914 - 1371 “B” ( 36” - 54” ) “C” DUCT END DETAIL “A” “A” SEE DETAIL “A” DIMENSIONS WEIGHT UNIT 48HC**14 2215 1009 116.0 2945 62.5 1590 59.5 1510 NOTES:...

  • Page 11: Step 7 - Convert To Horizontal And Connect

    Step 7 — Convert to Horizontal and Connect Unit is shipped in the Ductwork (When Required) — vertical duct configuration. Unit without factory-installed economizer or return air smoke detector option may be field- converted to horizontal ducted configuration using accessory CRDUCTCV002A00.
  • Page 12 5. If removed, reattach the panel under the damper. PANEL Hood Parts Plastic Tie Wrap Qty (2) PANEL CAULK HERE INDOOR INDOOR COIL COIL Screws for Metal Tray ACCESS ACCESS PANEL PANEL Qty (2) Fig. 13 — Indoor Coil Access Panel Relocation Fig.

  • Page 13: Step 9 - Install Flue Hood

    bottom of the access panel. The gas connection to the unit is The flue hood is Step 9 — Install Flue Hood — made to the -in. FPT gas inlet port on the unit gas valve. shipped screwed to the basepan beside the burner compartment access panel.
  • Page 14 FACTORY OPTION THRU-BASE CONNECTIONS (GAS CONNECTION) — This service connection kit con- sists of a -in. NPT gas adapter fitting (stainless steel), a -in. electrical bulkhead connector and a 1 -in. electrical bulkhead connector, connected to an “L” bracket covering the embossed (raised) section of the unit basepan in the condenser section.
  • Page 15 When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFPA 54/ ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA B149.1). In the absence of local building codes, adhere to the following pertinent recommendations: 9”...

  • Page 16: Step 11 - Install External Condensate Trap And Line

    MINIMUM PITCH 1˝ (25 mm) PER BASE RAIL 10´ (3 m) OF LINE 3˝ (76 mm) OPEN VENT TO ROOF SEE NOTE DRAIN ROOF CURB BURNER DRAIN PLUG ORIFICE NOTE: Trap should be deep enough to offset maximum unit static difference.
  • Page 17 Fig. 27 — Conduit into Factory Option Non-Fused Disconnect or HACR Fig. 30 — Mounting Position for Field Disconnects (up to 100A) Field power wires are connected to the unit at line-side pres- sure lugs at the main terminal block (TB1) or at factory-in- stalled option non-fused disconnect switch or HACR.
  • Page 18 IMPORTANT: Never operate a motor where a phase electrical components. Such operation would invalidate imbalance in supply voltage is greater than 2%. Use the any applicable Carrier warranty. following formula to determine the percentage of volt- age imbalance: NOTE: Check all factory and field electrical connections for tightness.
  • Page 19 Units Without Disconnect or HACR Option Equip GR Lug Disconnect Ground (GR) 208/230-3-60 460-3-60 575-3-60 Units With Disconnect or HACR Option Optional Disconnect Switch Factory Wiring Fig. 33 — Location of Non-Fused Disconnect Ground Enclosure (GR) Equip GR Lug To field install the NFD shaft and handle: Disconnect factory test leads;...
  • Page 20 6. Tighten the locking screw to secure the shaft to the HACR circuit breaker. 7. Turn the handle to the OFF position with red arrow point- ing at OFF. 8. Install the handle on to the painted cover horizontally with the red arrow pointing to the left. 9.
  • Page 21 NOTICE/AVIS Pwd-CO Fuse Convenience Outlet Utilization Switch Maximum Intermittent Use 15 - Amps Maximum Continuous Use 8 - Amps Observe a 50% limit on the circuit Loading above 8 - Amps Utilisation de la prise utilitaire Usage intermittent maximum 15 - Amps Usage continu maximum 8 - Amps Observez une limite de 50% sur le circuit Chargement au-dessus de 8 - Amps...
  • Page 22 Installing Weatherproof Cover — A weatherproof while-in- use cover for the factory-installed convenience outlets is now required by UL standards. This cover cannot be factory-mount- ed due its depth; it must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.
  • Page 23 (available as factory-installed option or as field-installed acces- See Fig. 45. sory, for use on a Carrier Comfort Network ® or as a stand alone control) or the RTU Open Controller for Building Management...

  • Page 24: Humidi-Mizer

    Refer to the installation instructions included with ® Humidi-MiZer System Control Connections the Carrier Edge Pro Thermidistat device for more infor- HUMIDI-MIZER — SPACE RH CONTROLLER mation. NOTE: The Humidi-MiZer system is a factory-installed option. The Humidi-MiZer dehumidification system requires a field-supplied and installed space relative humidity control de- vice.
  • Page 25 Fig. 48 — Typical Humidi-MiZer Adaptive Dehumidification System Humidistat Wiring...

  • Page 26: Economi$Er

    Edge Programable Thermostat Unit CTB THERMOSTAT O/W2/B SRTN Humidi-MiZer™ FIOP *Connection not required. Fig. 49 — Typical Rooftop Unit with Humidi-MiZer ® Adaptive Dehumidification System with Edge ® Thermidistat Device W7220 economizer controller indicates a device fail error on EconoMi$er ®...
  • Page 27 Relay Digital Output Rating at 30 Vac (maximum power ECONOMIZER MODULE WIRING DETAILS — Use from Class 2 input only) — 1.5A run: Fig. 51 and Tables 7 and 8 to locate the wiring terminals for the Economizer module. 3.5A inrush at 0.45PF (200,000 cycles) or NOTE: The four terminal blocks are removable.
  • Page 28 Table 8 — Economizer Module - Right Hand Table 9 — HH57AC081 Sensor Wiring Terminal Blocks Terminations LABEL TYPE DESCRIPTION TERMINAL TYPE DESCRIPTION Top Right Terminal Blocks NUMBER LABEL AUX2 I 24 vac IN The first terminal is not used. S-BUS Communications S-BUS...
  • Page 29 • Press the (Enter) button to display the first item in the 10. Press the (Menu Up/Exit) button to return to the pre- currently displayed menu. vious menu. MENU STRUCTURE — Table 11 illustrates the complete hi- erarchy of menus and parameters for the EconoMi$er ®...
  • Page 30 Table 11 — Menu Structure PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT FIRST STAGE COOLING DEMAND (Y1–IN) ECONO AVAIL YES/NO YES = economizing available; the system can use outside air for free cooling when required FIRST STAGE COOLING RELAY OUTPUT ECONOMIZING YES/NO YES = outside air being used for 1 stage cooling...
  • Page 31 Table 11 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT ACT COUNT 1 to 65535 Displays number of times actuator has cycled. 1 cycles equals 180 deg. of actuator movement in any direction. ACTUATOR OK/Alarm (on Alarm Displays ERROR if voltage or torque is below actuator range.
  • Page 32 Table 11 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT INSTALL 01/01/10 Display order = MM/DD/YY Setting order = DD, MM, then YY. UNITS DEG F or C Sets economizer controller in degrees Fahrenheit or Celsius EQUIPMENT CONV Conventional or HP...
  • Page 33 Table 11 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT MAT T CAL 0.0°F ±2.5°F SUPPLY AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration temperature sensor. OAS T CAL 0.0°F ±2.5°F OUTSIDE AIR TEMPERATURE CALIBRATION...
  • Page 34 Table 11 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT SHUTDOWN ACTIVE AUX2 IN is programmed for SHUTDOWN and 24 V has been applied to AUX2 IN terminal. DMP CAL RUNNING DAMPER CALIBRATION ROUTINE RUNNING If DCV Auto enable has been programmed, when the W7220 is complet- ing a calibration on the dampers, this alarm will display.
  • Page 35 Table 12 — Damper Minimum Position Settings and Readings on Checkout Menu DEMAND CONTROLLED VENTILATION FAN SPEED SETPOINTS CHECKOUT (CO2 SENSOR) MIN POS VMAX–HS MIN POS H VMAX–HS MIN POS L VMAX–LS VENT MIN VMAX–HS VENT MAX VMAX–HS VENT MIN H VMAX–HS VENT MAX H VMAX–LS...
  • Page 36 Table 15 — Enthalpy Operation No DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE HIGH 0v/Off 0v/Off MIN POS Closed NONE HIGH 24v/On 0v/Off MIN POS Closed HIGH 24v/On...
  • Page 37 Table 18 — Dry Bulb Operation With DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed...
  • Page 38 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 55 — Single Enthalpy Curve Boundaries Table 21 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 39: Low Ambient Control (Factory Option)

    NOTE: Upon power up, the module waits 60 minutes before checking for alarms. This allows time for all the configured devices (e.g. sensors, actuator) to become operational. The WARNING exception is the SAT sensor which will alarm immediately. Failure to follow this warning could result in personal If one or more alarms are present and there has been no key- injury, property damage, or death.
  • Page 40 Fig. 56 — 48HC14 Control Box Component Locations with ComfortLink Controls...
  • Page 41 Fig. 57 — 48HC14 ComfortLink Control Wiring Diagram...
  • Page 42 Fig. 58 — 48HC14 ComfortLink Power Wiring Diagram...
  • Page 43 Fig. 59 — 48HC14 ComfortLink with Humidi-MiZer Power Wiring Diagram...

  • Page 44: Premierlink Controller (Factory Option)

    (CCN) devices. This control is de- signed to allow users the access and ability to change factory- The PremierLink controller requires the use of a Carrier defined settings, thus expanding the function of the standard electronic thermostat or a CCN connection for time broadcast unit control board.
  • Page 45 Fig. 62 — PremierLink Wiring Schematic...
  • Page 46 ® Fig. 63 — PremierLink™ Wiring Schematic with Humidi-MiZer System Option...

  • Page 47: Supply Air Temperature (Sat) Sensor

    NOTE: Refer PremierLink Controller Installation, Start-up, Supply Air Temperature (SAT) Sensor — and Configuration Instructions for complete PremierLink con- FIOP-equipped 48HC**14 units, the unit is supplied with a troller configuration, operating sequences and troubleshooting supply-air temperature (SAT) sensor (33ZCSENSAT). This information.
  • Page 48 CCN Gnd (WHT) Digital, 5VDC AUX OUT(Power Exhaust) (Output)Discrete 24VAC CCN —(BLK) Digital, 5VDC LEGEND — Carrier Comfort Network (communication bus) CMPSAFE — Compressor Safety FILTER — Filter Switch — Fire Shutdown — Indoor Air Quality (CO — Outdoor Air Quality (CO —...
  • Page 49 SPACE SENSORS — The PremierLink™ controller is fac- tory-shipped configured for Space Sensor Mode. A Carrier T- 55 or T-56 space sensor must be used. T-55 space temperature sensor provides a signal of space temperature to the Premier- Link controller. T-56 provides same space temperature signal plus it allows for adjustment of space temperature setpoints from the face of the sensor by the occupants.

  • Page 50: Economizer Controls

    SPACE THERMOSTAT THERMOSTAT 4-12 J4-10 0-10VDC J4-8 SIG COM 4-20mA J4-6 ALARM RELAY CONTACTS J4-4 H G 24 VAC 24 VDC THERMOSTAT 8 7 6 5 4 3 2 1 Fig. 69 — Space Thermostat Connections If the 48HC**14 unit has an economizer system and free- cooling operation is required, a sensor representing Return Air Temperature must also be connected (field-supplied and in- stalled).
  • Page 51 STAT CONNECTIONS The sensor must be mounted vertically on the wall. The Space Relative Humidity Sensor connections The acces- Carrier logo should be orientated correctly when the sensor is — sory space relative humidity sensor (33ZCSENSRH-01) is in- properly mounted.
  • Page 52 Filter Switch (NO, close on rising pressure (high drop)) Thermostat J4-4 Fig. 76 — PremierLink™ Controller Filter Switch Connection When the filter switch’s NO contact set closes as filter pres- Vin Gnd sure drop increases (indicating dirt-laden filters), the input sig- nal to the PremierLink controller causes the filter status point to read “DIRTY.”...
  • Page 53 1000-ft section. Optically isolated RS-485 repeaters are re- lead (typically BLK) to the unit’s TB3-16 terminal. See quired every 1000 ft. Fig. 80. NOTE: Carrier device default is 9600 baud. Communications Bus Wire Specifications The CCN — Communication Bus wiring is field-supplied and field-in- CCN Bus stalled.

  • Page 54: Rtu Open Control System

    and control through communication with several Building Au- The RTU Open RTU Open Controller System — tomation Systems (BAS) through popular third-party network controller is factory-mounted in the 48HC**14 unit’s main systems. The available network systems are BACnet* MP/TP, control box, to the left of the CTB. See Fig. 82. Factory wiring Modbus†...
  • Page 55 Fig. 82 — RTU Open System Control Wiring Diagram...
  • Page 56 Fig. 83 — RTU Open System Control Wiring Diagram with Humidi-MiZer System Option...
  • Page 57 “Run Enable” status. See Input/Output section for additional instruc- tions. The RTU Open controller requires the use of a Carrier space -in. hole in the flange or duct. Use two field-supplied, self- sensor. A standard thermostat cannot be used with the RTU drilling screws to secure the sensor probe in a horizontal orien- Open system.

  • Page 58: Field Connections

    SPACE TEMPERATURE (SPT) SENSORS — There are Fig. 85 — RTU Open Controller T-56 Sensor two types of SPT sensors available from Carrier, resistive input Connections non-communicating (T55, T56, and T59) and Rnet communi- Connect T-59 The T-59 space sensor requires a separate, —...
  • Page 59 Do not mount the IAQ sensor in drafty areas such as near SPACE RELATIVE HUMIDITY SENSOR OR HUMIDI- supply ducts, open windows, fans, or over heat sources. Allow STAT at least 3 ft (0.9 m) between the sensor and any corner. Avoid Humidi-MiZer ®...

  • Page 60: Communication Wiring - Protocols

    Fan Status The fan status accessory is a field-installed ac- — cessory. This accessory detects when the indoor fan is blowing J4-1 or J4-4 + 24 VDC air. When installing this accessory, the unit must be configured SUPPLY VOLTAGE  ...

  • Page 61: Local Access

    SW3 Protocol Selection PROTOCOL Select BACnet MS/TP (Master) Unused Select Baud Baud Select Modbus (Slave) Unused Select Baud Baud N2 (Slave) Unused LonWorks Unused NOTE: DS = Dip Switch BACnet MS/TP SW3 example shown COMM OPTION Baud Rate Selections SET TO PORT SET TO MSTP 38.4k...

  • Page 62: Outdoor Air Enthalpy Control

    Access Port LOCAL ACCESS RNET PORT Connect to +12 DVC Rnet- computer’s Rnet+ CR2032 USB port Connect to UI-10 the Local UI-11 Access port USB Link Kit RTU Open Controller Fig. 94 — PC Running Field Assistant Table 29 — LEDs The LEDs on the RTU Open Control Board (see Fig.

  • Page 63: Smoke Detectors

    DIFFERENTIAL ENTHALPY CONTROL — Differential board may be necessary to complete the unit and smoke detec- enthalpy control is provided by sensing and comparing the out- tor configuration to meet project requirements. side air and return air enthalpy conditions. Install the outdoor Units equipped with factory-optional Return Air smoke de- air enthalpy control as described above.

  • Page 64: Step 13 - Adjust Factory-Installed Options

    Unit Without Economizer or Economizer 2 Position Damper 2 Position Damper ® Fig. 99 — EconoMi$er IV Wiring • Electrical/Mechanical thermostat and subbase Step 13 — Adjust Factory-Installed Options • Thermidistatt device SMOKE DETECTORS — Smoke detector(s) will be con- •...

  • Page 65: Pre-Start And Start-Up

    BLOWER PULLEY V-BELT MOTOR PULLEY MOTOR BELT DEFLECTION FORCE (LBS) BELT SMALLEST MOUNTING UNNOTCHED CROSS SHEAVE NOTCHED BELTS BELTS MOTOR MOUNTING BOLTS (4) SECTION DIAMETER USED USED PLATE 3.0-3.6 Fig. 101 — Belt Drive Motor Mounting A, AX 3.8-4.8 5.0-7.0 This completes the mechan- Pre-Start and Start-Up —...
  • Page 66 © Carrier Corporation 2018 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480178-01 Printed in U.S.A. Form 48HC-14-03SI Pg 66 3-18 Replaces: 48HC-14-02SI...

  • Page 67: Start-Up Checklist

    START-UP CHECKLIST (Remove and use for job file) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sec- tions of this Installation Instructions.
  • Page 68  10. RESTORE SETPOINTS FOR THERMOSTAT AND HUMIDISTAT REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS © Carrier Corporation 2018 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480178-01 Printed in U.S.A.

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