Table of Contents
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
UNIT CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 3
Building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . . 4
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . 5
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . 5
Step 3 - Field Fabricate Ductwork . . . . . . . . . . . . . 23
Step 4 - Make Unit Duct Connections . . . . . . . . . . 23
Step 6 - Trap Condensate Drain . . . . . . . . . . . . . . 24
Step 7 - Install Gas Piping . . . . . . . . . . . . . . . . . . . 24
Step 8 - Install Supply-Air Thermistors (Staged and
Modulating Gas Units Only) . . . . . . . . . . . . . . . . . 25
Step 9 - Make Electrical Connections . . . . . . . . . . 25
Damper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Step 13 - Install All Accessories . . . . . . . . . . . . . . 33
• DUCTWORK
®
Communication Option Wiring . . . . . . . . 36
Using ZS Sensor or an Equipment Touch . . . . . . . 38
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480495-01
Single Package Gas Heating/Electric Cooling
Rooftop Units with ComfortLink Controls
Installation Instructions
Page
Printed in U.S.A.
Form 48A-22SI
and Puron
®
Refrigerant (R-410A)
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.
WARNING
Before performing service or maintenance operations on unit,
turn off main power switch to unit. Electrical shock could
cause personal injury.
WARNING
Improper installation, adjustment, alteration, service, or main-
tenance can cause property damage, personal injury, or loss of
life. Refer to the User's Information Manual provided with this
unit for more details.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on R-410A refrigerant equipment.
Pg 1
WeatherMaker
48A020-060
2-24
Replaces: 48A-21SI
®
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Summary of Contents for Carrier WeatherMaker 48A 020
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Page 1: Table Of Contents
WeatherMaker ® 48A020-060 Single Package Gas Heating/Electric Cooling Rooftop Units with ComfortLink Controls and Puron ® Refrigerant (R-410A) Installation Instructions CONTENTS SAFETY CONSIDERATIONS Page Installation and servicing of air-conditioning equipment can be SAFETY CONSIDERATIONS ....1 hazardous due to system pressure and electrical components. - Page 2 WARNING WARNING DO NOT USE TORCH to remove any component. System FIRE HAZARD contains oil and refrigerant under pressure. Failure to follow this warning could result in severe personal To remove a component, wear protective gloves and goggles injury and/or property damage. and proceed as follows: Inlet pressure tap set screw must be tightened and 1/8 in.
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Page 3: Unit Considerations
Extensive equipment damage can be caused by operating this equipment while construction, renovation, or remodeling is UNIT CONSIDERATIONS occurring in the space or near the equipment. Carrier recommends Temporary Operation for a Completed Building using equipment designed for specific construction duty or spe-... -
Page 4: Acoustical Considerations
• Use round duct wherever possible because it is less noisy. ACOUSTICAL CONSIDERATIONS • Seal all penetrations around ductwork entering the space. In order to minimize sound transmitted to the space, please con- • Make sure that ceiling and wall contractors do not attach form to the following recommendations (see Fig. -
Page 5: Installation
INSTALLATION Step 2 — Rig and Place Unit Inspect unit for transportation damage. See Tables 1-6 for physical data and specifications. File any claim with transportation agency. CAUTION Do not drop unit; keep upright. Use spreader bars over unit to pre- vent sling or cable damage. - Page 6 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. Dimensions in [ ] are in millimeters. All other dimensions are in inches. (48A2/A3/A6/A7-035 HIGH GAS HEAT ONLY) Fig.
- Page 7 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. Dimensions in [ ] are in millimeters. All other dimensions are in inches. Fig.
- Page 8 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. Dimensions in [ ] are in millimeters. All other dimensions are in inches. Fig.
- Page 9 7. DIMENSIONS ARE IN INCHES [MM]. Fig. 6 — Base Unit Dimensions — 48A2,A3,A6,A7020-035...
- Page 10 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 accessory roof curb.
- Page 11 6. DIMENSIONS ARE IN INCHES [MM]. Fig. 8 — Base Unit Dimensions — 48A4,A5,A8,A9020-035...
- Page 12 Filter access side: 10’ - 0” [3048] (for removal of evaporator coil) For smaller service and operational clear- ances, contact Carrier application engineer- ing department. Bottom ducts are designed to be attached to accessory roof curb. If unit is mounted on...
- Page 13 FOR CENTERS OF GRAVITY, OPERATING CORNER WEIGHTS, SEE FIG. 14. 50.00 50.00 50.00 [1270] [1270] [1270] 10.49 [266] 2.57 2.57 HOOD REMOVED [65] [65] DAMPER OPENING 42.31 18.25 WITH HOOD [1075] [464] MAIN CONTROL BOX 31.25 [795] OPENING RETURN [613] 88.24 15.53 WITH PANEL...
- Page 14 FOR CENTERS OF GRAVITY, OPERATING CORNER WEIGHTS, SEE FIG. 14. 50.00 50.00 50.00 [1270] [1270] [1270] 10.49 12.93 150.47 [3822.0] [266] [328.3] 2.57 2.57 [65] [65] 5.12 [130.0] MAIN CONTROL BOX 13.20 [335.3] VIEW A-A 12.63 6.97 88.24 [320.8] [177.0] [2241] TOP COVERS 13.88...
- Page 15 50.00 50.00 50.00 [1270] [1270] [1270] FOR CENTERS OF GRAVITY, 10.49 [266] OPERATING AND CORNER 2.57 2.57 [65] [65] WEIGHTS, SEE FIG. 14. 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 50.00 50.00 50.00 [1270] [1270] [1270] 10.49 FOR CENTERS OF GRAVITY, [266] 2.57 2.57 OPERATING AND CORNER [65] [65] HOOD REMOVED WEIGHTS, SEE FIG. 14. DAMPER OPENING WITH HOOD 18.25 42.31 [464] [1075] MAIN CONTROL BOX 31.25 [795] RETURN 15.53 OPENING [613] [395]...
- Page 17 14 - 8 1/2" 3 - 11 1/8" 1613 2078 2484 2351 50A2/A3/A6E/A7E 6826 (3096) 5. FOR SMALLER SERVICE AND OPERATIONAL CLEARANCES, CONTACT CARRIER APPLICATION 50A4/A5/A8E/A9E 7041 (3194) OPERATING CENTER OF GRAVITY ENGINEERING DEPARTMENT. CORNER WEIGHT (kg) UNIT SIZE WEIGHT 6.
- Page 18 Table 1 — Physical Data — 48A Units UNIT 48A 020D/E 025D/E 027D/E 030D/E 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...
- Page 19 Table 1 — Physical Data — 48A Units (cont) UNIT 48A 035D/E 040D/E 050D/E 060D/E 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…ZP122/2…ZP122 2…ZP154/2…ZP154 Number of Refrigerant Circuits Precharged Precharged...
- Page 20 Table 2 — Unit Operating Weights* (lb) UNIT SIZE 48A2D,A3D,A6D,A7D 3825 3961 3961 3992 4340 4770 4914 7066 48A2E,A3E,A6E,A7E 3905 4041 4041 4072 4500 4930 5074 7306 48A4D,A5D,A8D,A9D 3865 4001 4001 4032 4380 4810 4954 7106 48A4E,A5E,A8E,A9E 3945 4081 4081 4112 4540 4970...
- Page 21 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 22 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...
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Page 23: Step 3 - Field Fabricate Ductwork
48A4, A5, A8, AND A9 UNITS Step 3 — Field Fabricate Ductwork Secure all ducts to building structure. Use flexible duct connectors Remove shipping covers from supply and return air openings. between unit and ducts as required. Insulate and weatherproof all Attach field-supplied ductwork to unit. -
Page 24: Step 6 - Trap Condensate Drain
Step 6 — Trap Condensate Drain See Fig. 6-13 for drain location. Condensate drain is open to atmo- sphere and must be trapped. Install a trapped drain at the drain location. One 1-in. female coupling is provided inside the unit evaporator section for condensate drain connection. -
Page 25: Optional Staged Gas Units
OPTIONAL STAGED GAS UNITS Step 9 — Make Electrical Connections See Table 7 for staged gas information. Staging pattern is selected POWER WIRING during controls start-up. For complete information and service in- Units are factory wired for the voltage shown on unit nameplate. structions for staged gas control units, see Controls, Start-Up, Op- eration, Service and Troubleshooting literature. -
Page 26: Field Control Wiring
(staged air volume), VVT ® (variable volume variable tem- Voltage to compressor terminals during compressor operation perature) or Carrier TEMP system control operation. must be within the voltage range indicated on the unit nameplate. Phases must be balanced within 2%. •... - Page 27 Both the T55 and T56 sensors have a CCN communications port and this should be wired to the CCN Communications TB3 board Unit can be controlled with a Carrier-approved accessory electro- if it is desired to have access to the CCN system through the mechanical or electronic thermostat that has two stages of cooling, sensor.
- Page 28 Remote IAQ Override chrome vinyl, or Teflon with a minimum operating temperature If the control is being used with a non-Carrier building manage- range of –20°C to 60°C (–4°F to 140°F) is required. Table 9 lists ment system, it supports the use of the remote IAQ override cables that meet the requirements.
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Page 29: Step 10 - Make Outdoor-Air Inlet Adjustments
Step 10 — Make Outdoor-Air Inlet Adjustments ECONOMIZER AND FIXED OUTDOOR AIR DAMPER HOOD SIDE Hoods are used on all units with economizer or adjustable self- closing fixed outdoor air damper. FLANGE NOTE: If accessory power exhaust or barometric relief packages are being added to the unit, install power exhaust or barometric BLACK relief before installing economizer hoods. - Page 30 TOP HOOD FILTER FLANGE ASSEMBLY POINTING DOWN MOUNTING ANGLE FASTENED TO BOTTOM OF FILTER ASSEMBLY CROSSMEMBER SIDE Fig. 36 — Correctly Assembled Bottom Filter SEAL STRIP HOOD Assembly, Sizes 020-035 Only Fig. 32 — Adding Seal Strip to Hood Top and Side Hoods FILTER FLANGE...
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Page 31: Step 11 - Position Power Exhaust/Barometric Relief
Step 11 — Position Power Exhaust/Barometric Relief Damper Hood All units are shipped with the hoods folded inside the unit in a shipping position. For 48A2,A3,A6,A7 units the hood must be tilt- ed out once the unit is installed. On 48A4,A5,A8,A9 units (de- signed for horizontal supply and return), the assemblies will have to be relocated to the return ductwork. - Page 32 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) “SIDE #1” “END #1” J BO X 23.28” 42.62” PLENUM RA TED CABLE 42.62 (FIELD SUPPLIED )
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Page 33: Step 12 - Route Vav Static Pressure Sensors
For a negative-pressure building, route the IMPORTANT: Carrier recommends the installation of high tap to atmosphere and the low tap to building air. field-fabricated wind baffles on all vertically oriented con-... - Page 34 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: 48A060 units with MCHX do not require baffles. LEGEND MCHX —...
- Page 35 Remove the panels located below the economizer outdoor-air Step 14 — Perform Field Modifications dampers. These openings will be used for the return-air DUCTWORK ductwork. There are 2 panels on 48A2,A3,A6,A7020-050 Bottom Return Units (48A2,A3,A6,A7) Field-Modified for units. There are 3 panels on 48A2,A3,A6,A7060 units. These Side Return openings are normally used for power exhaust or barometric The 48A2,A3,A6,A7 units with bottom return air connec-...
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Page 36: Bacnet Communication Option Wiring
NOTE: Use the same polarity throughout the network segment. BACnet ®1 Communication Option Wiring Insert the power screw terminal connector into the UPC WIRING THE UPC OPEN CONTROLLER TO THE MS/TP Open controller’s power terminals if they are not currently NETWORK connected. - Page 37 Fig. 49 — Open System Network Wiring BACnet ® BT 485 SHIELD PORT S1 BACnet MS/TP NET- NET+ EIA-485 485-2WIRE Fig. 50 — BT485 Terminator Installation Table 11 — Open System Wiring Specifications and Recommended Vendors WIRING SPECIFICATIONS RECOMMENDED VENDORS AND PART NUMBERS CONTRACTORS CONNECT AIR WIRE TYPE...
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Page 38: Using Zs Sensor Or An Equipment Touch
Table 12 — 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 40 © 2024 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480495-01 Printed in U.S.A. Form 48A-22SI Pg 40 2-24 Replaces: 48A-21SI...
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