Carrier WeatherMaster 50GC 14 Series Installation Instructions Manual
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Carrier WeatherMaster 50GC 14 Series Installation Instructions Manual

Carrier WeatherMaster 50GC 14 Series Installation Instructions Manual

Single package rooftop cooling only with puron (r-410a) refrigerant and ecoblue™ fan technology
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 2
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . 6
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . 7
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . 7
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . 9
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . 10
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
®
CONTROL CONNECTIONS
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500380-01
Installation Instructions
Page
Printed in U.S.A.
Form No. 50GC-14-01SI
WeatherMaster
Single Package Rooftop Cooling Only
with Puron
and EcoBlue™ Fan Technology
2
Step 12 - Install Accessories . . . . . . . . . . . . . . . . .39
Step 13 - Fan Speed Set Up . . . . . . . . . . . . . . . . . .39
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. 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
Pg 1
®
50GC-*14
®
(R-410A) Refrigerant
6-23
Replaces: New

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  • Page 1: Table Of Contents

    ® WeatherMaster 50GC-*14 Single Package Rooftop Cooling Only with Puron ® (R-410A) Refrigerant and EcoBlue™ Fan Technology Installation Instructions • INPUTS CONTENTS • OUTPUTS Page • ENVIRONMENTAL • ECONOMIZER MODULE WIRING DETAILS SAFETY CONSIDERATIONS ....1 •...

  • Page 2: General

    severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used CAUTION to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight PERSONAL INJURY HAZARD suggestions which will result in enhanced installation, reliability, Failure to follow this caution may result in personal injury.
  • Page 3 Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging Compliance 50 - Cooling with Optional Electric Heat 0 = Standard Packaged Rooftop 1 = LTL ® Model Series - WeatherMaster Electrical Options GC - High Efficiency Packaged RTU A = None C = Non-Fused Disconnect with EcoBlue™...
  • Page 4 Fig. 2 — 50GC-*14 Unit Dimensional Drawing...
  • Page 5 Fig. 2 — 50GC-*14 Unit Dimensional Drawing (cont)

  • Page 6: Installation

    DIMENSION LOCATION CONDITION in. (mm) 48 (1219) Unit disconnect is mounted on panel. 18 (457) No disconnect, convenience outlet option. 18 (457) Recommended service clearance. 12 (305) Minimum clearance. 42 (1067) Surface behind servicer is grounded (e.g., metal, masonry wall). 36 (914) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).

  • Page 7: Curb-Mounted Installation

    CURB-MOUNTED INSTALLATION Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit. Install curb Install field-fabricated ductwork inside curb SLAB MOUNT (HORIZONTAL UNITS ONLY) Install accessory thru-base service connection package Provide a level concrete slab that extends a minimum of 6 in.
  • Page 8 Fig. 5 — 50GC-*14 Roof Curb Details...

  • Page 9: 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 50GC-*14 2079 116.0 2945 56.0 1420 59.5 1510 NOTES: 1. Dimensions in () are in millimeters. 2.

  • Page 10: All Units

    Discard supply duct cover. Install accessory Carefully lift the hood assembly (with metal tray) through the CRDUCTCV002A00 to cover the vertical supply duct opening. filter access opening and assemble per the steps outlined in Use the return duct cover removed from the end panel to cover the Economizer and Two-Position Hood Setup, on page 10.

  • Page 11: Step 9 - Install External Condensate Trap And

    Open the filter clips, which are located underneath the Step 9 — Install External Condensate Trap and hood top. Insert the aluminum filter into the bottom filter Line rack (hood divider). Push the filter into position past the The unit has one 3/4 in. condensate drain connection on the end of open filter clips.
  • Page 12 NOTE: Check all factory and field electrical connections for tight- ness. Field-supplied wiring shall conform with the limitations of minimum 63°F (33°C) rise. Field Power Supply For those units without through-the-curb power, conduit must be used to route the main power from the condenser end, via the power entry in the corner post of the unit (see Fig.
  • Page 13 Field power wires are connected to the unit at line-side pressure Units Without Disconnect or HACR Option lugs at the main terminal block (TB1) or at factory-installed option non-fused disconnect switch. See Fig. 22. Max wire size Equip is no. 2 AWG (copper only). See Fig. 23. GR Lug WARNING FIRE HAZARD...

  • Page 14: Field Wiring

    Failure to follow this caution may result in equipment damage. hex screws on the NFD enclosure. Operation on improper line voltage or excessive phase imbal- 11. Re-install the unit front panel. ance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.

  • Page 15: Units Without Factory-Installed Non-Fused Disconnect

    Turn the handle to the OFF position with red arrow point- ing at OFF. Install the handle on to the painted cover horizontally with the red arrow pointing to the left. Secure the handle to the painted cover with (2) screws and lock washers supplied.
  • Page 16 Non-powered type Requires the field installation of a general-purpose 125-v 15-A Pwd-CO circuit powered from a source elsewhere in the building. Observe Fuse national and local codes when selecting wire size, fuse or breaker Switch requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle.

  • Page 17: All Units

    Field Control Wiring The 50GC-*14 requires an external temperature control device. This device can be a thermostat (field-supplied) or a SystemVu™ 1/2 in. Electrical controller (available as factory-installed option for use on a Carrier Bulkhead Connector Comfort Network or as a stand-alone control). All field added ®...

  • Page 18: Electric Heaters

    Unit without Thru-Base Connection Kit Refer to the Small Roof Top Units Accessory Electric Heater and Single Point Box installation instructions for further details. Pass the thermostat control wires through the bushing on the unit end panel. Route the wire through the snap-in wire tie and up to the web bushing near the control box.

  • Page 19: Single Point Boxes And Supplementary Fuses

    Heater Module Fig. 37 — Heater Module Installation SINGLE POINT BOXES AND SUPPLEMENTARY FUSES All fuses on 50GC units are 60-A. (Note that all heaters are qualified for use with a 60-A fuse, regardless of actual heater When the unit MOCP device value exceeds 60-A, unit-mounted ampacity, so only 60-A fuses are necessary.) supplementary fuses are required for each heater circuit.

  • Page 20: Low-Voltage Control Connections

    This device may be a separate humidistat control (contact closes on rise in space RH above control setpoint) or a combina- Humidistat tion thermostat-humidistat control device such as Carrier’s Edge ® Pro Thermidistat™ device with isolated contact set for dehu- midification control.

  • Page 21: Typical Unit Wiring Diagrams

    These wiring diagrams are mounted on the terminal on the UCB. Refer to the installation instructions inside of the unit control box. Refer to the wiring diagrams in included with the Carrier Edge ® Pro Thermidistat device the unit control box when making field power wiring connections.
  • Page 22 Fig. 44 — Typical Control Wiring Diagram, Electro-Mechanical with W7220 Controller...
  • Page 23 Fig. 45 — Typical Control Wiring Diagram, SystemVu™ Controller...
  • Page 24 Fig. 46 — Typical Power Wiring Diagram — 208/230, 460-3-60 Unit Shown...
  • Page 25 Fig. 47 — Typical Power Wiring Diagram — 575-3-60 Unit Shown...

  • Page 26: Economi$Er X (Factory-Installed Option)

    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 27: Economizer Module Wiring Details

    Storage Temperature: Table 5 — 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 28: Co 2 Sensor Wiring

    To use the keypad when working with menus: Table 6 — 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 29: Setup And Configuration

    SETUP AND CONFIGURATION IMPORTANT: Table 8 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 30 Table 8 — 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 31 Table 8 — 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 32 Table 8 — 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 33 Table 8 — 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 34 Table 8 — 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 35: Standard Or Single Speed Fan Operation

    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 50GC-*14 units. minimum position for the fan speed.

  • Page 36: 2Sp H/C (2 Speed Heat/Cool) Speed Fan Operation

    2SP H/C (2 SPEED HEAT/COOL) SPEED FAN OPERATION Refer to Table 11 for ENTH CURVE set point values. The W7220 calculates the enthalpy and dew point using the OA FAN TYPE = 2SP H/C is not used on 50GC-*14 units temperature and humidity input from the OA enthalpy sensor.

  • Page 37: Checkout

    CHECKOUT Press the (Enter) button to start the test. The unit pauses and then displays IN PROGRESS. Inspect all wiring connections at the economizer module’s termi- When the test is complete, DONE appears. nals, and verify compliance with the installation wiring diagrams. When all desired parameters have been tested, press the For checkout, review the Status of each configured parameter and (Menu Up) button to end the test.

  • Page 38: Smoke Detectors

    SMOKE DETECTORS ADDITIONAL APPLICATION DATA Smoke detectors are available as factory-installed options on Refer to the application data sheet titled “Factory-Installed Smoke 50GC models. Smoke detectors may be specified for supply air Detector, for Small and Medium Rooftop Units 2 to 25 Tons” for only, for return air without or with economizer, or in combination discussions on additional control features of these smoke detectors of supply air and return air.

  • Page 39: Step 11 - Adjust Factory-Installed Options

    Step 11 — Adjust Factory-Installed Options SMOKE DETECTORS Smoke detector(s) will be connected at the Unit Control Board (UCB), at terminals marked “Smoke Shutdown.” ECONOMI$ER X OCCUPANCY SWITCH If external occupancy control is desired, connect a time clock or remotely controlled switch (closed for Occupied, open for Unoc- cupied sequence) at terminals marked OCCUPANCY.

  • Page 40: 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 41 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 42 © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500380-01 Printed in U.S.A. Form No. 50GC-14-01SI Pg 42 6-23 Replaces: New...

  • Page 43: Start-Up Checklist

    START-UP CHECKLIST 50GC SINGLE PACKAGED ROOFTOP ELECTRIC COOLING UNITS (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 44 (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. 04-53500380-01 Printed in U.S.A.

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