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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 3
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . 7
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . 8
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . 8
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . 10
Step 7 - Convert to Horizontal and Connect . . . . 11
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . 11
Step 9 - Install Flue Hood . . . . . . . . . . . . . . . . . . . . 12
Step 10 - Install Gas Piping . . . . . . . . . . . . . . . . . . 13
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 12 - Make Electrical Connections . . . . . . . . . 16
®
Integrated Gas Controller . . . . . . . . . . . . . . . . . . . . . 27
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480477-01
Installation Instructions
Page
Printed in U.S.A.
Form No. 48GC-14-02SI Rev. B
Single Package Rooftop with
Gas Heating/Electric Cooling
• DEHUM/MECH COOLING (SUBCOOLING) MODE
EconomizerONE (Factory Option) . . . . . . . . . . . . . .32
SystemVu™ Controller (Factory Option) . . . . . . . . .53
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Step 13 - Adjust Factory-Installed Options . . . . . .54
Step 14 - Install Accessories . . . . . . . . . . . . . . . . .54
Step 15 - Fan Speed Set Up . . . . . . . . . . . . . . . . . .54
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes, including ANSI (American National
Standards Institute) Z223.1. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguisher available for all brazing operations.
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 personal
injury.
Understand the signal words DANGER, WARNING, CAUTION,
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 signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
Pg 1
WeatherMaster
48GC**14
3-24
Replaces: 48GC-14-01SI
®
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Related Manuals for Carrier WeatherMaster 48GC 14 Series
Summary of Contents for Carrier WeatherMaster 48GC 14 Series
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Page 1: Table Of Contents
® WeatherMaster 48GC**14 Single Package Rooftop with Gas Heating/Electric Cooling Installation Instructions • DEHUM/MECH COOLING (SUBCOOLING) MODE CONTENTS • DEHUMIDIFICATION (HOT GAS REHEAT) MODE Page • REHEAT CONTROL SAFETY CONSIDERATIONS ....1 EconomizerONE (Factory Option) . - Page 2 AVERTISSEMENT DANGER RISQUE D’INTOXICATION AU MONOXYDE DE ELECTRICAL SHOCK HAZARD CARBONE Failure to follow this warning will result in personal injury or Si ces directives ne sont pas suivies, cela peut entraîner des death. blessures graves ou une intoxication au monoxyde de carbone pouvant causer la mort, si des produits de combustion Before performing service or maintenance operations on unit, s’infiltrent dans le bâtiment.
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Page 3: General
GENERAL These installation instructions cover the 48GC size 14 units with WARNING gas heat and electric cooling. Units are pre-wired and pre-charged FIRE OR EXPLOSION HAZARD with environmentally balanced Puron (R-410A) refrigerant at the ® factory. Failure to follow the safety warnings exactly could result in serious injury, death or property damage. - Page 4 Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging Compliance 48 = Gas Heat Packaged Rooftop 0 = Standard 1 = LTL Model Series - WeatherMaster ® GC = High Efficiency Packaged RTU Electrical Options with EcoBlue™...
- Page 5 Fig. 2 — 48GC**14 Unit Dimensional Drawing...
- Page 6 Fig. 2 — 48GC**14 Unit Dimensional Drawing (cont)
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Page 7: Installation
CLEARANCE Service with Service with Operating SURFACE Conductive Barrier Non-conductive Barrier Clearance FRONT 48 in. (1219 mm) 36 in. (914 mm) 18 in. (457 mm) LEFT 48 in. (1219 mm) 42 in. (1067 mm) 18 in. (457 mm) BACK W/O ECONOMIZER 48 in. -
Page 8: Step 2 - Plan For Sequence Of Unit Installation
Step 2 — Plan for Sequence of Unit Installation The support method used for this unit will dictate different sequences for the steps of unit installation. For example, on curb-mounted units, some accessories must be installed on the unit before the unit is placed on the curb. Review the following for recommended sequences for installation steps. - Page 9 Fig. 5 — 48GC**14 Roof Curb Details...
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Page 10: Step 6 - Rig And Place Unit
Place All Gasket in Place Before Placing Unit on Roof Curb. (914-1371) “B” 36”-54” “C” Detail “A” Duct End “A” “A” See Detail “A” DIMENSIONS MAX WEIGHT UNIT 48GC**14 2218 1006 116.0 2945 58.5 1485 59.5 1510 NOTES: 1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used. 2. -
Page 11: Step 7 - Convert To Horizontal And Connect
Step 7 — Convert to Horizontal and Connect Unit is shipped in the 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. To convert to horizontal config- uration, remove screws from side duct opening covers and remove Remove Hood Parts... -
Page 12: Economizer And Two-Position Damper Hood
ECONOMIZER AND TWO-POSITION DAMPER HOOD SETUP Panel NOTE: If the power exhaust accessory is to be installed on the unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter for use in the power exhaust Indoor Coil hood assembly. -
Page 13: Step 10 - Install Gas Piping
Step 10 — Install Gas Piping Installation of the gas piping must be accordance with local build- CAUTION ing codes and with applicable national codes. In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC). In Can- EQUIPMENT DAMAGE ada, installation must be in accordance with the CAN/CSA Failure to follow this caution may result in equipment damage. -
Page 14: All Units
ALL UNITS 1/2 in. Electrical Other hardware required to complete the installation of the gas Bulkhead Connector 1-1/2 in. Electrical supply line will include a manual shutoff valve, a sediment trap Bulkhead (drip leg), and a ground-joint union. A pressure regulator valve Connector may also be required (to convert gas pressure from pounds to 3/4 in. -
Page 15: Step 11 - Install External Condensate Trap And
WARNING Failure to follow this warning could result in personal injury, death and/or property damage. • Connect gas pipe to unit using a backup wrench to avoid damaging gas controls. • Never purge a gas line into a combustion chamber. •... -
Page 16: Step 12 - Make Electrical Connections
NOTE: TEST LEADS - Unit may be equipped with short leads (pigtails) on the field line connection points on contactor C or op- tional disconnect switch, see Fig. 26. These leads are for factory Minimum Pitch run-test purposes only; remove and discard before connecting 1 in. -
Page 17: Units With Factory-Installed Non-Fused
If the field disconnect is larger than 100A, it must be attached to the unit using accessory CRDISBKT001A00 — disconnect switch bracket (see Fig. 30). Follow the instructions provided with this accessory. For smaller field disconnects, be sure to use 1/2-in. screws to mount the disconnect directly to the end panel (see Fig. -
Page 18: Units Without Factory-Installed Non-Fused Disconnect
Measure the tip of the shaft to the top surface of the To field install the HACR circuit breaker shaft and handle: pointer to be 3.75 to 3.88-in. (95 to 99 mm) for 80A and Remove the unit front panel (see Fig. 2). 100A NFD and 3.43 to 3.56-in. -
Page 19: Convenience Outlets
Operation on improper line voltage or ex- cessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any Pwd-CO Transformer applicable Carrier warranty. Convenience Outlet GFCI max voltage deviation from average voltage... -
Page 20: All Units
Non-powered type ALL UNITS Requires the field installation of a general-purpose 125-v 15-A Test the GFCI receptacle by pressing the TEST button on the face circuit powered from a source elsewhere in the building. Observe of the receptacle to trip and open the receptacle. Check for proper national and local codes when selecting wire size, fuse or breaker grounding wires and power line phasing if the GFCI receptacle requirements and disconnect switch size and location. -
Page 21: Humidi-Mizer ® Control Connections
This device can be a thermostat (field-supplied) or a SystemVu™ plied and field-installed space relative humidity control device. controller (available as factory-installed option for use on a Carrier This device may be a separate humidistat control (contact closes Comfort Network ®... -
Page 22: Typical Unit Wiring Diagrams
® Pro Thermidistat Route the cable through the snap-in wire tie and up to the web Connecting the Carrier Humidistat (HL38MG029) bushing near the control box. This provides the UL-required Route the humidistat 2-conductor cable (field-supplied) clearance between high-voltage and low-voltage wiring. - Page 23 Fig. 47 — Typical Control Wiring Diagram, Electromechanical withPOL224 Controller...
- Page 24 Fig. 48 — Typical Control Wiring Diagram, SystemVu™ Controller...
- Page 25 Fig. 49 — Typical Power Wiring Diagram — 208/230, 460-3-60 Unit Shown...
- Page 26 Fig. 50 — Typical Power Wiring Diagram — 575-3-60 Unit Shown...
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Page 27: Integrated Gas Controller
When the thermostat calls for heating, power is sent to W on the Integrated Gas Controller Integrated Gas Controller (IGC) board. An LED (light emitting di- This unit contains an Integrated Gas Controller (IGC) board. The ode) on the IGC board turns on and remains on during normal op- IGC control board uses a flue gas pressure switch that senses pres- eration. - Page 28 UNIT CONTROL BOARD Fig. 53 — Typical IGC Control Wiring Diagram a, b, c, d Table 8 — IGC Board LED Alarm Codes ACTION TAKEN BY FLASH DESCRIPTION RESET METHOD PROBABLE CAUSE CONTROL CODE Normal Operation — — — Loss of power to the IGC. Check 5 amp fuse Hardware Failure No gas heating.
- Page 29 Pre-purge: Induced draft motor Ignition: Gas valve and Call for heat: starts and runs for 30 seconds at igniter energize for 2 W terminal is energized. ignition speed, Speed 1. seconds. Rectification: Flame sensor activates for 2 seconds after Gas valve and igniter ignition period.
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Page 30: Humidi-Mizer Dehumidification System
Humidi-MiZer Dehumidification System DEHUM/MECH COOLING (SUBCOOLING) MODE (Optional) This mode increases the latent heat removal and decreases sen- sible cooling compared to normal cooling. This occurs when Units with the factory-installed Humidi-MiZer system option there is a cooling and dehumidification demands. are capable of providing multiple modes of improved dehu- midification as a variation of the normal cooling cycle. - Page 31 Indoor Supply Valve 3-Wway Valve Condenser Coil Hot Gas Reheat Coil Outdoor Air Expansion Valve (TXV) Compressor Evaporator Coil = Closed Valve = Open Valve Indoor Return Air = 3-Way Valve Fig. 56 — Subcooling Mode – Humidi-MiZer System for 48GC 14 Indoor Supply Valve 3-Way...
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Page 32: Economizerone (Factory Option)
the harness are made to the C (24 vac common) and R (24 vac EconomizerONE (Factory Option) power) terminals of the economizer controller. See Fig. 60. ECONOMIZER SETTINGS LED Indication Interface Overview NOTE: If different faulty events occur at the same time, then EconomizerONE sensor/DAC LED lights up following the priority below: Red ... - Page 33 Table 10 — LED Indication FREE SENSOR Power STATUS COOLING DAC LED Yellow Yellow Yellow Commissioning mode Blinking Blinking Blinking Power start up Yellow On Yellow On Yellow On Free cooling is running Green On — — Free cooling is available Green —...
- Page 34 Table 11 — Free Cooling Functions CONTROL MODE SENSORS USED ENABLE FREE COOLING? The outside air dry bulb temperature is compared with the set temperature OA (outside air) temperature sensor Control Mode 1 shutoff setpoint. • Fixed Dry bulb If the outside air dry bulb temperature is below the temperature shutoff MA (Mixed Air) temperature sensor setpoint, then the outside air is used to meet all or part of the cooling demand.
- Page 35 Table 12 — 1 and 2-Stage Cooling Stage I/O Logic Table 15 — Different Fan Speeds with Different Configured Outputs ECONOMIZER COOLING COOLING CONDITION MET STAGE 1 STAGE 2 FAN TYPE 1-SPEED COOLING 2-STAGE COOLING • Spd H (regardless of •...
- Page 36 Table 17 — Different Damper Position Settings with Different Configured Outputs (DCV is Enabled) FAN TYPE 1-STAGE COOLING 2-STAGE COOLING • 2VENTMIN H to 2VENTMAX H (regardless of • 2VENTMIN H to 2VENTMAX H (regardless of 1-SPEED FAN cooling demand, OCC=Yes) cooling demand, OCC=Yes) 2VENTMIN L to 2VENTMAXL ...
- Page 37 Exhaust Fan Operation Users can enable this function only from the Climatix mobile ap- ™ plication if the related function is available in the current mobile Up to two exhaust fans can be connected to the economizer application version. controller. Fault Detection and Diagnostics •...
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Page 38: Wiring
WIRING WARNING Failure to follow this caution may result in damage to equipment. Be sure to allow enough time for compressor startup and shutdown between checkout tests so that the compressors do not short-cycle. Mounting Devices Connected to the Economizer Controller Devices like damper actuators, sensors (temperature sensor, humidity sensor, combination temperature and humidity sensor, sensor), thermostats, and exhaust fans can be connected to... - Page 39 Table 19 — EconomizerONE Control Wiring Settings LABEL TYPE DESCRIPTION RS485 Modbus A Line A RS485 Modbus B Line B ¬ GND_ISO Earth Ground Type II NTC 10K or 0-10 vdc Mixed or Discharge Air Temperature Sensor Mixed or Discharge Air Temperature Sensor Common Type II NTC 10K or 0-10 vdc Outside Air Temperature Sensor 0-10 vdc or 4-20mA...
- Page 40 Connecting Peripheral Devices to the Economizer Controller See Fig. 65-69 for wiring details. • Outside Air: Connect to the Mixed or Discharge Air Temperature Sensor OAT and COM terminals of the Outside Air Temperature Sensor device. • Return Air (Differential): Return Air Temperature Sensor Connect to the RAT and S-COM...
- Page 41 • Outside Combination Temperature/ Humidity: Connect Combo Temperature and Humidity Sensor to the OAT, COM, and OAH terminals of the device. • Combo Temperature and Humidity Sensor Return Combination Temperature/ Humidity: Connect to the RAT, S-COM, and RAH terminals of the device. Fig.
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Page 42: Setup And Configuration
SETUP AND CONFIGURATION NOTE: Parameters and display menus may display differently/ dynamically if different applications are configured. See Tables 20-27. IMPORTANT: Before setup and configuration, it is recommend- ed to obtain some location-based values, such as shutoff points, IMPORTANT: Not all operations are available on the local or utilize the location services in the Climatix ™... - Page 43 Table 20 — Status Display PARAMETER DESCRIPTION VALUE 1FREECOOL Indicates whether the system can use outdoor air for free cooling. 1ECON ENAB Indicates whether outdoor air is being used for the first stage of cooling. Indicates whether the space is occupied. If users choose ALWAYS for 6OCC when configuring I/Os, then the parameter value is YES;...
- Page 44 Table 21 — Parameter Settings — Basic PARAMETER DESCRIPTION RANGE DEFAULT Temperature shutoff setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the 2 TEMP OFF 48...80°F; increment by 1 63°F network provided by a Wi-Fi/WLAN stick plugged into the economizer controller.
- Page 45 Table 22 — Parameter Settings — Advanced PARAMETER DESCRIPTION VALUE/RANGE DEFAULT 3FREEZE POS Anti-freeze protection damper position (closed or minimum). 3SD ACT POS Damper position during shutdown (open or closed). MAT sensor location: • Choose MAT if the sensor is installed before the DX (Direct Expansion) coil. 3DIF T LOC •...
- Page 46 Table 23 — Parameter Settings — I/O Configurations (cont) PARAMETER DESCRIPTION VALUE DEFAULT Choose “COOL 2” if Cooling Stage 2 is available (another compressor is COOL 2 6Y2O COOL 2 connected to the Economizer). Otherwise, choose “NONE”. NONE Auxiliary DO-1. Configurable as: NONE •...
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Page 47: Installing Optional Hh57Lw001 Single
Table 26 — Enter Running State PARAMETER DESCRIPTION 8RUN STATE Change to Running State. Press Enter to confirm the change. 8ENTER RUN? Confirm the change to Running State. Perform factory reset. Press Enter to confirm the reset. (This action resets the controller 8FACTORY DEF password to default: OneBT.) 8DEF CONFIRM? - Page 48 Fig. 70 — HH57LW001 Dimensional, Connection and Switching Information Fig. 71 — HH79NZ039 Dry Bulb and Mixed Air Sensor Wiring Actuator Wiring Harness HH79NZ039 Outside Air Temperature Sensor Outside Air Damper Fig. 73 — California Title 24 Zones Fig. 72 — EconomizerONE Component Locations (CRECOMZR108A00 Shown)
- Page 49 U.S. and Canada I-Codes / ASHRAE Zones Climate Zone 1 Climate Zone 5 and Marine Climate Zone 2 Climate Zone 6 Climate Zone 3 Climate Zone 7 and 8 Climate Zone 4 (Except Marine) Fig. 74 — U.S. and Canada Climate Zones Table 28 —...
- Page 50 Economizers are shipped standard with an HH79NZ039 outside Table 29 — California Title 24 Regional High Limit air dry bulb sensor (see Fig. 71). System default setting (high temp Dry Bulb Temperature Settings limit) is 63°F (17°C) and has a range of 48°F to 80°F (9°C to REQUIRED HIGH LIMIT 27°C).
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Page 51: Checkout
CHECKOUT Status Use the Status menu (refer to Table 20) to check the parameter Inspect all wiring connections at the economizer module’s termi- values for the various devices and sensors configured. nals, and verify compliance with the installation wiring diagrams. For checkout, review the Status of each configured parameter and NOTE: For information about menu navigation and use of the perform the Test Commands tests (refer to Table 25). -
Page 52: Troubleshooting
TROUBLESHOOTING For EconomizerONE troubleshooting issues see Table 31. Table 31 — Operating Issues and Concerns SYMPTOM REASON SOLUTION An alarm is displayed on the Sensor, damper, or the whole working Check sensor, damper, or the whole working system following the detailed alarm information. system may not work properly DAC LED is blinking RED Damper slippage... -
Page 53: Systemvu™ Controller (Factory Option)
SystemVu™ Controller (Factory Option) For details on operating 48GC**14 units equipped with the factory-installed SystemVu controller option, refer to the FC/GC Series Single Package Rooftop Units with SystemVu Controller Controls, Start-up, Operation and Troubleshooting manual. Smoke Detectors Smoke detectors are available as factory-installed options on 48GC models. -
Page 54: Step 13 - Adjust Factory-Installed Options
If installing any accessories listed at the bottom of the Set Up Step 13 — Adjust Factory-Installed Options Label, add accessory rpm to base unit rpm in upper portion of SMOKE DETECTORS label. Smoke detector(s) will be connected at the Unit Control Board NOTE: The Fan Speed Set Up labels are located on the High (UCB), at terminals marked “Smoke Shutdown.”... -
Page 55: Units With Systemvu™ Controls
ESP in. wg Factory Setting: Calculator 9.0 V 3000 Field Setting: 3250 Record field setting here 3500 3750 4000 Switch Range: 4250 4500 4.1 - 7.5 4750 10.0 6.9 - 8.7 5000 7.7 - 10.0 Field Accessories: Economizer * Overlap in A, B, C switch range designed for maximum field adjustment potential. - Page 56 ESP in. wg Calculator 1250 1348 1441 1528 1610 1688 1762 1832 1899 1963 3000 1336 1428 1515 1598 1677 1753 1824 1893 1959 2021 3250 1423 1509 1591 1670 1746 1819 1888 1955 2020 2081 3500 1510 1591 1669 1744 1817 1887...
- Page 58 © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480477-01 Printed in U.S.A. Form No. 48GC-14-02SI Rev. B Pg 58 3-24 Replaces: 48GC-14-01SI...
- Page 59 START-UP CHECKLIST FOR 48GC**14 SINGLE PACKAGE ROOFTOP GAS HEATING/ELECTRIC COOLING UNIT (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 sections of this document.
- Page 60 (Y/N) _____ 10. Restore set points for thermostat and humidistat. (Y/N) _____ © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480477-01 Printed in U.S.A.
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