Advertisement
Quick Links
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 3
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . 7
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . . 8
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . 8
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 8
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 10
Step 7 — Convert to Horizontal and Connect . . . . 11
• ALL UNITS
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 11
• TWO-POSITION DAMPER HOOD REMOVAL
(FACTORY OPTION)
• ECONOMIZER AND TWO-POSITION DAMPER HOOD
SETUP
Step 9 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . 12
Step 10 — Install Gas Piping . . . . . . . . . . . . . . . . . . 13
• FACTORY-OPTION THRU-BASE GAS CONNECTIONS
• ALL UNITS
Step 11 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 12 — Make Electrical Connections . . . . . . . . . 16
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR CIRCUIT BREAKER
• UNITS WITHOUT FACTORY-INSTALLED
NON-FUSED DISCONNECT
• ALL UNITS
• CONVENIENCE OUTLETS
• ALL UNITS
• FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• HUMIDI-MIZER
®
CONTROL CONNECTIONS
• TYPICAL UNIT WIRING DIAGRAMS
Integrated Gas Controller . . . . . . . . . . . . . . . . . . . . . 27
EconoMi$er X (Factory-Installed Option) . . . . . . . . 30
• PRODUCT DESCRIPTION
• SYSTEM COMPONENTS
• SPECIFICATIONS
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480444-01
Installation Instructions
Page
Printed in U.S.A.
Form No. 48GC-14-01SI
Single Package Rooftop with
Gas Heat/Electric Cooling
• INPUTS
• OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• S-BUS SENSOR WIRING
• CO
SENSOR WIRING
2
• INTERFACE OVERVIEW
• USER INTERFACE
• KEYPAD
• MENU STRUCTURE
• SETUP AND CONFIGURATION
• TIME-OUT AND SCREENSAVER
• STANDARD OR SINGLE SPEED FAN OPERATION
• 2 SPEED FAN OPERATION
• 2SP H/C (2 SPEED HEAT/COOL) SPEED FAN
OPERATION
• 3 SPEED FAN OPERATION
• ENTHALPY SETTINGS
• CHECKOUT
• TROUBLESHOOTING
SystemVu™ Controller (Factory Option) . . . . . . . . .42
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
• COMPLETING INSTALLATION OF RETURN-AIR
SMOKE SENSOR
• ADDITIONAL APPLICATION DATA
Step 13 — Adjust Factory-Installed Options . . . . . .43
• SMOKE DETECTORS
• ECONOMI$ER X OCCUPANCY SWITCH
Step 14 — Install Accessories . . . . . . . . . . . . . . . . .43
Step 15 — Fan Speed Set Up . . . . . . . . . . . . . . . . . .43
• UNITS WITH ELECTRO-MECHANICAL CONTROLS
• UNITS WITH SYSTEMVU™ CONTROLS
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.
Pg 1
WeatherMaster
48GC**14
6-23
Replaces: New
®
Advertisement
Related Manuals for Carrier WeatherMaster 48GC 14 Series
Summary of Contents for Carrier WeatherMaster 48GC 14 Series
- Page 1 ® WeatherMaster 48GC**14 Single Package Rooftop with Gas Heat/Electric Cooling Installation Instructions • INPUTS CONTENTS • OUTPUTS Page • ENVIRONMENTAL • ECONOMIZER MODULE WIRING DETAILS SAFETY CONSIDERATIONS ....1 •...
- Page 2 Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. WARNING DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards CARBON-MONOXIDE POISONING HAZARD which could result in personal injury or death. CAUTION is used Failure to follow instructions could result in severe personal to identify unsafe practices, which may result in minor personal injury or death due to carbon-monoxide poisoning, if...
- Page 3 WARNING AVERTISSEMENT FIRE HAZARD RISQUE D'INCENDIE OU D'EXPLOSION Failure to follow this warning could result in severe personal Si les consignes de sécurité ne sont pas suivies à la lettre, cela injury and/or property damage. peut entraîner la mort, de graves blessures ou des dommages matériels.
- 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)
- Page 7 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 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...
- Page 10 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 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 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 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 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 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 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 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 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 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 max voltage deviation from average voltage GFCI...
- Page 20 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 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 ® 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. Route the humidistat 2-conductor cable (field-supplied) Feed the cable through the bushing and into the bottom left through the bushing the unit’s louvered end panel.
- Page 23 Fig. 47 — Typical Control Wiring Diagram, Electro-Mechanical with W7220 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...
- Page 27 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 de-energerized Is flame...
- Page 30 User Interface EconoMi$er X (Factory-Installed Option) Provides status for normal operation, setup parameters, checkout PRODUCT DESCRIPTION tests, and alarm and error conditions with a 2-line 16 character The EconoMi$er ® X system is an expandable economizer control LCD display and four button keypad. system, which includes a W7220 economizer module (controller) Electrical with an LCD and keypad (see Fig.
- Page 31 Storage Temperature: Table 10 — Economizer Module - Right Hand –40°F to 150°F (–40°C to 65°C) Terminal Blocks Shipping Temperature: LABEL TYPE DESCRIPTION –40°F to 150°F (–40°C to 65°C) Top Right Terminal Blocks Relative Humidity: AUX2 I 24 vac IN The first terminal is not used.
- Page 32 To use the keypad when working with menus: Table 11 — HH57AC081 Sensor Wiring Terminations • Press the ▲ (Up arrow) button to move to the previous TERMINAL menu. TYPE DESCRIPTION NUMBER LABEL • Press the ▼ (Down arrow) button to move to the next S-BUS menu.
- Page 33 SETUP AND CONFIGURATION IMPORTANT: Table 13 illustrates the complete hierarchy. Before being placed into service, the W7220 economizer module Your menu parameters may be different depending on must be setup and configured for the installed system. your configuration. For example, if you do not have a DCV (CO ) sensor, then IMPORTANT: During setup, the economizer module is none of the DCV parameters appear and only MIN POS will...
- Page 34 Table 13 — W7220 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 35 Table 13 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT MECH COOL ON Displays stage of mechanical cooling that is active. 0, 1, or 2 HEAT STAGES ON Displays the stage of heat pump heating that is active. STATUS SUPPLY FAN SPEED (cont)
- Page 36 Table 13 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT 0°F to 50°F ENERGY RECOVERY VENTILATOR UNIT OUTDOOR AIR ERV OAT SP 32°F (–18°C to 10°C); TEMPERATURE SETPOINT increment by 1°F Only displayed when AUX1 O = ERV Exhaust fan set point for single speed units.
- Page 37 Table 13 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT COOLING STAGE 3 DELAY 0 min, 5 min, Delay after stage 2 cool has been active. Turns on second stage of 15 min, then cooling when economizer is first stage and mechanical cooling is STG3 DLY 2.0h...
- Page 38 Table 13 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT DISCHARGE AIR S-BUS SENSOR ERROR DA SYLK T ERR Discharge air sensor has failed or become disconnected - check wiring then replace sensor if the alarm continues. OUTSIDE AIR TEMPERATURE SENSOR ERROR OA SENS T ERR Outdoor air temperature sensor has failed or become disconnected...
- Page 39 STANDARD OR SINGLE SPEED FAN OPERATION The W (heating mode) is not controlled by the W7220 but it re- quires the status to know where to position the OA damper for FAN TYPE = 1 SPEED is not used on 48GC**14 units. minimum position for the fan speed.
- Page 40 2SP H/C (2 SPEED HEAT/COOL) SPEED FAN OPERATION CHECKOUT FAN TYPE = 2SP H/C is not used on 48GC**14 units Inspect all wiring connections at the economizer module’s termi- nals, and verify compliance with the installation wiring diagrams. For checkout, review the Status of each configured parameter and 3 SPEED FAN OPERATION perform the Checkout tests.
- Page 41 Power Loss (Outage or Brownout) TROUBLESHOOTING All set points and advanced settings are restored after any power Alarms loss or interruption. The economizer module provides alarm messages that display on NOTE: All settings are stored in non-volatile flash memory. the 2-line LCD. Status NOTE: Upon power up, the module waits 60 minutes before checking for alarms.
- Page 42 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 43 NOTE: The Fan Speed Set Up labels are located on the High Volt- Step 13 — Adjust Factory-Installed Options age cover in the Control Box. SMOKE DETECTORS Connect a multimeter to the Vdc terminals on the UCB. Smoke detector(s) will be connected at the Unit Control Board Set the Range Switch to either A, B, or C per the Switch (UCB), at terminals marked “Smoke Shutdown.”...
- Page 44 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 45 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 46 © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480444-01 Printed in U.S.A. Form No. 48GC-14-01SI Pg 46 6-23 Replaces: New...
- Page 47 START-UP CHECKLIST 48GC PACKAGED ROOFTOP UNITS WITH GAS HEAT AND ELECTRIC COOLING (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 Installation Instruction document.
- Page 48 (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. 04-53480444-01 Printed in U.S.A.
Need help?
Do you have a question about the WeatherMaster 48GC 14 Series and is the answer not in the manual?
Questions and answers