Carrier WeatherMaker 50A020 Installation Instructions Manual
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Carrier WeatherMaker 50A020 Installation Instructions Manual

Single package electric cooling rooftop units with electric heat option, comfortlink controls and puron refrigerant (r-410a)
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . 3
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . 3
Step 3 - Field Fabricate Ductwork . . . . . . . . . . . . . . 3
Step 4 - Make Unit Duct Connections . . . . . . . . . . . 3
Step 5 - Trap Condensate Drain . . . . . . . . . . . . . . 22
Damper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500271-01
Single Package Electric Cooling Rooftop Units
with Electric Heat Option, ComfortLink Controls
Installation Instructions
Page
Printed in U.S.A.
Form 50A-18SI
and Puron
®
Refrigerant (R-410A)
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
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.
WARNING
Before performing service or maintenance operations on unit,
turn off main power switch to unit. Electrical shock could
cause personal injury.
WARNING
1.
Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, personal injury,
or loss of life. Refer to the User's Information Manual
provided with this unit for more details.
2.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and goggles
and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from system
using both high-pressure and low pressure ports.
c. Traces of vapor should be displaced with nitrogen and
the work area should be well ventilated. Refrigerant in
contact with an open flame produces toxic gases.
d. Cut component connection tubing with tubing cutter and
remove component from unit. Use a pan to catch any oil
that may come out of the lines and as a gage for how
much oil to add to the system.
e. Carefully un-sweat remaining tubing stubs when neces-
sary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal inju-
ry or death.
Pg 1
WeatherMaker
50A020-060
11-21
Replaces: 50A-17SI
®

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Summary of Contents for Carrier WeatherMaker 50A020

  • Page 1: Table Of Contents

    WeatherMaker ® 50A020-060 Single Package Electric Cooling Rooftop Units with Electric Heat Option, ComfortLink Controls and Puron ® Refrigerant (R-410A) Installation Instructions Follow all safety codes. Wear safety glasses and work gloves. Use CONTENTS quenching cloth for unbrazing operations. Have fire extinguisher Page available for all brazing operations.

  • Page 2: Location

    Ductwork • Utilize flexible connectors between the unit and the supply WARNING and return ducts. UNIT OPERATION AND SAFETY HAZARD • Supply and return air main trunk ducts should be located over hallways and/or public areas. Failure to follow this warning could cause personal injury, death and/or equipment damage.

  • Page 3: Installation

    INSTALLATION Step 3 — Field Fabricate Ductwork Secure all ducts to building structure. Use flexible duct connectors Step 1 — Provide Unit Support between unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing CAUTION and mastic in accordance with applicable codes.
  • Page 4 NOTES: Unless otherwise specified, all dimensions are to outside of part. Roof curb accessory CRRFCURB005A00 is shipped disassembled. All roof curb parts are to be 14 ga. galvanized steel. Units with electric heat must be installed with a 90 degree elbow on the supply duct prior to any supply take offs or branches.
  • Page 5 NOTES: Unless otherwise specified, all dimensions are to outside of part. Roof curb accessory CRRFCURB006A00 is shipped disassembled. All roof curb parts are to be 14 ga. galvanized steel. Units with electric heat must be installed with a 90 degree elbow on the supply duct prior to any supply take offs or branches.
  • Page 6 NOTES: Unless otherwise specified, all dimensions are to outside of part. Roof curb accessory CRRFCURB014A00 is shipped disassembled. All roof curb parts are to be 14 ga. galvanized steel. Units with electric heat must be installed with a 90 degree elbow on the supply duct prior to any supply take offs or branches.
  • Page 7 NOTES: Unless otherwise specified, all dimensions are to outside of part. Roof curb accessory CRRFCURB009A00 is shipped disassembled. All roof curb parts are to be 14 ga. galvanized steel. Units with electric heat must be installed with a 90 degree elbow on the supply duct prior to any supply take offs or branches.
  • Page 8 Fig. 6 — Base Unit Dimensions — 50A2,A3,A6,A7020-035...
  • Page 9 NOTES: Weights include economizer. center of gravity. Unit clearances: Top of units: no overhang Condenser coil: 4’ - 0” [1219] Economizer side: 6’ - 0” [1829] Heat side: 4’ - 0” [1219] Filter access side: 10’ - 0” [3048] (for removal of evaporator coil) Bottom ducts are designed to be attached to acces- sory roof curb.
  • Page 10 Fig. 8 — Base Unit Dimensions — 50A4,A5,A8,A9020-035...
  • Page 11 NOTES: Weights include economizer. center of gravity. Unit clearances: Top of units: no overhang Condenser coil: 4’ - 0” [1219] Economizer side: 6’ - 0” [1829] Heat side: 4’ - 0” [1219] Filter access side: 10’ - 0” [3048] (for removal of evaporator coil) Dimensions in [ ] are in millimeters.
  • Page 12 FOR CENTERS OF GRAVITY, OPERATING AND CORNER WEIGHTS, SEE FIG. 14 50.00 50.00 50.00 [1270] [1270] [1270] HOOD REMOVED 10.49 DAMPER OPENING [266] 2.57 2.57 WITH HOOD 42.31 [65] [65] 18.25 [1075] [464] MAIN CONTROL BOX 31.25 [795] OPENING RETURN [613] 45.44 WITH PANEL...
  • Page 13 FOR CENTERS OF GRAVITY, OPERATING AND CORNER WEIGHTS, SEE FIG. 14 50.00 50.00 50.00 [1270] [1270] [1270] 10.49 [266] 2.57 2.57 [65] [65] 12.93 MAIN CONTROL BOX 150.47 [3822.0] [328.3] 5.12 [130.0] 13.20 88.24 [335.3] [2241] TOP COVERS VIEW A-A 13.88 [353] 12.63...
  • Page 14 FOR CENTERS OF GRAVITY, OPERATING AND CORNER WEIGHTS, SEE FIG. 14 50.00 50.00 50.00 [1270] [1270] [1270] 10.49 [266] 2.57 2.57 [65] [65] HOOD REMOVED DAMPER OPENING WITH HOOD 18.25 42.31 [464] [1075] MAIN CONTROL BOX 31.25 [795] RETURN 15.53 OPENING [613] [395]...
  • Page 15 FOR CENTERS OF GRAVITY, OPERATING AND CORNER WEIGHTS, SEE FIG. 14 50.00 50.00 50.00 [1270] [1270] [1270] 10.49 [266] 2.57 2.57 [65] [65] 12.93 MAIN CONTROL BOX 150.47 [3822.0] [328.3] 5.12 [130.0] 88.24 TOP COVERS 13.20 [2241] [335.3] VIEW A-A 13.88 [353] 12.63...
  • Page 16 NOTES: Weights include economizer or outdoor air damper. center of gravity. Unit clearances: Top of units: no overhang Condenser coil: 4’ - 0” [1219] Economizer side: 6’ - 0” [1829] Heat side: 4’ - 0” [1219] Filter access side: 10’ - 0” [3048] (for removal of evaporator coil) Bottom ducts are designed to be attached to accessory roof curb.
  • Page 17 Table 1 — Physical Data — 50A Units UNIT 50A NOMINAL CAPACITY (tons) BASE UNIT See Unit Weights Table OPERATING WEIGHT (lb) COMPRESSOR Quantity ... Type (Ckt 1/Ckt 2) 2 ... ZP67/1…ZP91 2 ... ZP91/1…ZP91 2 ... ZP91/1…ZP91 2…ZP72, 2…ZP72 Number of Refrigerant Circuits Precharged Precharged...
  • Page 18 Table 1 — Physical Data — 50A Units (cont) UNIT 50A NOMINAL CAPACITY (tons) BASE UNIT See Unit Weights Table OPERATING WEIGHT (lb) COMPRESSOR Quantity ... Type (Ckt 1/Ckt 2) 2 ... ZP67/2…ZP104 2…ZP104/2…ZP104 2…ZP154/2…ZP154 2…ZP122/2…ZP122 Number of Refrigerant Circuits Precharged Precharged Precharged...
  • Page 19 Table 2 — 50A Base Unit Operating Weights (lb) UNIT SIZE 50A2,A3,A6,A7 3625 3761 3761 3792 4025 4455 4599 6826 50A4,A5,A8,A9 3703 3839 3839 3870 4218 4648 4792 7041 Table 3 — 50A Option and Accessory Weights (lb) UNIT SIZE Barometric Relief Non-Modulating Power Exhaust Modulating Power Exhaust...
  • Page 20 Table 6 — Evaporator Fan Motor Data MOTOR UNIT MOTOR MOTOR SHEAVE BUSHING SHEAVE BUSHING BELT BELT MOTOR SHAFT SIZE SHAFT DIA. SHEAVE PITCH DIAMETER SHEAVE PITCH DIAMETER (QUANTITY) TENSION SPEED (in.) (P/N) DIAMETER (in.) (P/N) DIAMETER (in.) (P/N) (lb at .25 in.) (RPM) (in.) (in.)
  • Page 21 WEIGHT MODEL INCHES INCHES INCHES 50A2/A3/A6/A7 027 4854 2202 87.7 2227 97.2 2469 44.1 1120 48A2/A3/A6/A7D 027 4944 2243 87.7 2227 96.1 2441 43.7 1110 48A2/A3/A6/A7E 027 5024 2279 87.7 2227 95.6 2428 43.4 1102 50A4/A5/A8/A9 027 4932 2237 87.7 2227 93.6 2379...

  • Page 22: Step 5 - Trap Condensate Drain

    a50-8108 a48-3714 Fig. 19 — Condensate Drain Trap Piping Details Fig. 16 — Air Distribution — Thru-the-Bottom (Typical Roof Curb or Slab Mount Shown) Step 6 — Make Electrical Connections POWER WIRING Units are factory wired for the voltage shown on unit nameplate. Provide a unit safety disconnect switch in the main power supply to each unit (Fig.
  • Page 23 Use strain relief going into control box through 3 -in. diameter hole provided. After wires are in unit control box, connect to pow- IMPORTANT: The variable air volume units use variable fre- er terminal block (see Power Wiring section on page 22). quency drives, which generate and can radiate radio frequency energy.

  • Page 24: Field Control Wiring

    4 or 9 as shown in Fig. 23. a48-6854 T55 SPT T56 SPT T58 Communicating Thermostat Carrier also has a fully communicating thermostat which, if used, will be wired to the CCN communication connections on TB3 as described in the Carrier Comfort Network Interface ®...
  • Page 25 PVC/nylon, vinyl, Teflon , or polyethylene. An aluminum/polyes- If the control is being used with non-Carrier building management ter 100% foil shield and an outer jacket of PVC, PVC/nylon, system, it supports the use of the remote IAQ override switch.

  • Page 26: Step 7 - Make Outdoor-Air Inlet Adjustments

    Smoke Sensor Interface Remove the screws on each end and along top of the outdoor air opening of unit. Set hood assembly in place and attach to The ComfortLink controls include an optional factory-installed re- unit using gasketed screws. See Fig. 30. turn air smoke detector.
  • Page 27 HOOD SIDE HOOD CROSS Fig. 30 — Removing Screws from the Outdoor Air HOOD MEMBER Opening of Unit SIDE Fig. 26 — Economizer Hood Assembly Fig. 27 — Top Hood with Speed Clips TOP HOOD BLOCK-OFF BAFFLE Fig. 31 — Mounting Block-Off Baffle to the Unit CROSSMEMBER SIDE SEAL STRIP...

  • Page 28: Step 8 - Position Power Exhaust/Barometric Relief

    FILTER TRACK FILTER COVER MOUNTING ANGLE FILTERS Fig. 38 — Filters and Filter Cover Fig. 34 — Flange and Mounting Angle Step 8 — Position Power Exhaust/Barometric Pointing Down Relief Damper Hood All units are shipped with the hoods folded inside the unit in a shipping position.
  • Page 29 ECONOMIZER HOOD 42.56” LOCA TIO N BAROMETRIC RELIEF OR POWER EXHAUST “SIDE #2” ECONOMIZER HOOD 23.28” TY P “END #2” 42” MIN. 12.94 R/ A (UNI T OPENING) a50-8110 “SIDE #1” “END #1” J BO X 23.28” 42.62” PLENUM RA TED CABLE 42.62 (FIELD SUPPLIED )

  • Page 30: Step 10 - Install All Accessories/Options

    FIELD-FABRICATED WIND BAFFLES a48-6983 IMPORTANT: Carrier recommends the installation of field- fabricated wind baffles on all vertically oriented condenser coils when operating in environments with prevailing winds of more than 5 mph and where temperatures drop below 32°F. See the Motormaster accessory installation guide for instructions.
  • Page 31 SIZES 020-035 SIZES 036-050 AND 060 RTPF DIMENSION “A” UNIT SIZE QUANTITY 020-035 78.125 ± 0.125 1984 ± 3 036-050 78.125 ± 0.125 1984 ± 3 118 ± 0.125 2997 ± 3 NOTE: 50A060 units with MCHX do not require baffles. LEGEND MCHX —...

  • Page 32: Step 11 - Perform Field Modifications

    Step 11 — Perform Field Modifications BACnet Communication Option Wiring DUCTWORK WIRING THE UPC OPEN CONTROLLER TO THE MS/TP NETWORK Bottom Return Units (50A2,A3,A6,A7) Field-Modified for Side Return The UPC Open controller communicates using BACnet on an MS/TP network segment communications at 9600 bps, 19.2 kbps, The 50A2,A3,A6,A7 units with bottom return air connec- 38.4 kbps, or 76.8 kbps.
  • Page 33 97.78” (020-050), 150.47” (051 AND 060) INSIDE DIMENSION 31.25” INSIDE a48-8245 Fig. 43 — Side Return Duct Dimensions BT485 TERMINATOR BACNET CONNECTION POWER LED (BAS PORT) Tx1 LED Rx1 LED Tx2 LED Rx2 LED BACNET BAUD RATE DIP SWITCHES EIA-485 JUMPERS ADDRESS ROTARY...
  • Page 34 Fig. 45 — Open System Network Wiring ® BACnet BT 485 SHIELD PORT S1 BACnet MS/TP NET- NET+ EIA-485 485-2WIRE Fig. 46 — BT485 Terminator Installation Table 9 — Open System Wiring Specifications and Recommended Vendors WIRING SPECIFICATIONS RECOMMENDED VENDORS AND PART NUMBERS CONTRACTORS WIRE CONNECT AIR...

  • Page 35: Using Zs Sensor Or An Equipment Touch

    Table 10 — MS/TP Wiring Recommendations SPECIFICATION RECOMMMENDATION CABLE Single twisted pair, low capacitance, CL2P, 22 AWG (7x30), TC foam FEP, plenum rated cable CONDUCTOR 22 or 24 AWG stranded copper (tin plated) INSULATION Foamed FEP 0.015 in. (0.381 mm) wall 0.060 in. (1.524 mm) O.D. COLOR CODE Black/White TWIST LAY...
  • Page 36 © 2021 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500271-01 Printed in U.S.A. Form 50A-18SI Pg 36 11-21 Replaces: 50A-17SI...

This manual is also suitable for:

Weathermaker 50a050Weathermaker 50a040Weathermaker 50a060

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