Carrier WeatherMaker 48A020 Installation Instructions Manual
  1. Manuals
  2. Brands
  3. Carrier Manuals
  4. Air Conditioner
  5. WeatherMaker 48A020
  6. Installation instructions manual
Carrier WeatherMaker 48A020 Installation Instructions Manual

Carrier WeatherMaker 48A020 Installation Instructions Manual

Single package gas heating/electric cooling rooftop units with comfortlink controls and puron refrigerant r-410a
Hide thumbs Also See for WeatherMaker 48A020:
Table of Contents

Advertisement

Quick Links

CONTENTS
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . . . 3
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 4
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 4
• POSITIONING
Step 3 - Field Fabricate Ductwork. . . . . . . . . . . . . . 21
• 48A2, A3, A6, A7 UNITS
• 48A4, A5, A8, A9 UNITS
Step 5 - Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 22
• 48A060 UNITS
Step 6 - Trap Condensate Drain. . . . . . . . . . . . . . . . 22
Step 7 - Install Gas Piping . . . . . . . . . . . . . . . . . . . . . 23
• OPTIONAL STAGED GAS UNITS
• POWER WIRING
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
AIR DAMPER
Relief Damper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Step 13 - Install All Accessories . . . . . . . . . . . . . . . 31
• DUCTWORK
MS/TP NETWORK
• MS/TP WIRING RECOMMENDATIONS

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should in-
stall, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service
Catalog No. 04-53480230-01
Single Package Gas Heating/Electric Cooling
Rooftop Units with ComfortLink Controls
Installation Instructions
Page
Printed in U.S.A.
and Puron
®
personnel. When working on air-conditioning equipment, ob-
serve 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 extinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, personal injury,
or loss of life. Refer to the User's Information Manual pro-
vided with this unit for more details.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instructions.
4. If you cannot reach your gas supplier, call the fire
department.
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and gog-
gles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from sys-
tem 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. Refrig-
erant 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 unsweat remaining tubing stubs when nec-
essary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal
injury or death.
Form 48A-20SI
Pg 1
WeatherMaker
48A020-060
Refrigerant (R-410A)
WARNING
WARNING
WARNING
3-19
Replaces: 48A-18SI
®

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the WeatherMaker 48A020 and is the answer not in the manual?

Questions and answers

Related Manuals for Carrier WeatherMaker 48A020

Summary of Contents for Carrier WeatherMaker 48A020

  • 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 personnel. When working on air-conditioning equipment, ob- CONTENTS serve precautions in the literature, tags, and labels attached to Page the unit, and other safety precautions that may apply. SAFETY CONSIDERATIONS.
  • Page 2 CAUTION WARNING DO NOT re-use compressor oil or any oil that has been FIRE HAZARD exposed to the atmosphere. Dispose of oil per local codes and Failure to follow this warning could result in personal inju- regulations. DO NOT leave refrigerant system open to air any ry, death, and/or property damage.

  • Page 3: Acoustical Considerations

    • Install the units close to vertical roof supports (columns or load bearing walls). AVERTISSEMENT • Locate the units at least 25 ft away from critical areas. If this is not possible, the ductwork and ceiling structure RISQUE D´INCENDIE OU D´EXPLOSION should be acoustically treated.

  • Page 4: Installation

    INSTALLATION ALTERNATE UNIT SUPPORT — When the preferred curb or slab mount cannot be used, support unit with sleepers on perime- ter, using unit curb support area. If sleepers cannot be used, sup- port long sides of unit (refer to Fig. 5-13) with a minimum number CAUTION of 4-in.
  • Page 7 a48-6717...
  • Page 9 A48-8689 A48-8689...
  • Page 17 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 18 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: Step 3 - Field Fabricate Ductwork

    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: Step 5 - Install Flue Hood

    a48-8242 Fig. 16 — Air Distribution — Thru-the-Side a48-3712 Fig. 18 — Flue Hood Location (48A020-050 Units) GAS SECTION ACCESS PANEL Fig. 17 — Outdoor Air and Return Air Sensors FLUE HOOD Location Step 5 — Install Flue Hood 48A2020-050 UNITS — Flue hood is shipped inside gas sec- WIND tion of unit.

  • Page 23: Step 7 - Install Gas Piping

    Table 7 — 48A Series Staged Gas Control MODEL NUMBER POSITION NUMBER OF HEAT SIZE STAGES 6,7,8 5 STAGES High 7 STAGES High a48-3714 9 STAGES High 11 STAGES Fig. 21 — Condensate Drain Trap Piping Details (Typical Roof Curb or Slab Mount Shown) Step 8 —...

  • Page 24: Step 9 - Make Electrical Connections

    Routing Through Bottom of Unit — If wiring is brought in Step 9 — Make Electrical Connections through bottom of unit, use field-supplied watertight conduit to POWER WIRING — Units are factory wired for the voltage route power wiring through the 3 -in.

  • Page 25: Field Control Wiring

    Install sensor according to the installation instructions included (CV and VAV) with accessory sensor. Locate sensor assembly on a solid interior • Network application with CCN (Carrier Comfort Net- wall in the conditioned space to sense average temperature. work ®...
  • Page 26 2413 or 5463 rier Comfort Network ® Interface section below. American A22503 Carrier Comfort Network Interface — The rooftop units can be Belden 8772 connected to the CCN system. The communication bus wiring is Columbia 02525 supplied and installed in the field. Wiring consists of shielded, 3- IMPORTANT: When connecting to CCN communication conductor cable with drain wire.

  • Page 27: Step 10 - Make Outdoor-Air Inlet

    Remote IAQ Override — If the control is being used with a non- NOTE: Before assembly of the economizer hood, check along the Carrier building management system, it supports the use of the re- outer edges of the economizer assembly for any seal strip protrud- mote IAQ override switch.
  • Page 28 12. Attach filter track under the hood assembly. See Fig. 39. 13. Attach black seal strip (provided) to filter cover. Seal strip should be applied centered over the holes of the one flange, making sure to fully cover holes and center over the other large flange.
  • Page 29 SPEED CLIPS BLOCK-OFF BAFFLE Fig. 38 — Bottom Filters Installed with Flange Pointing Down Fig. 34 — Mounting Block-Off Baffle to the Unit FILTER FLANGE ASSEMBLY POINTING DOWN MOUNTING ANGLE FASTENED TO BOTTOM OF FILTER ASSEMBLY Fig. 35 — Correctly Assembled Bottom Filter FLANGE Assembly, Sizes 020-035 Only POINTING...

  • Page 30: Step 11 - Position Power Exhaust/Barometric

    3 screws on each side and 3 screws along the bottom. Step 11 — Position Power Exhaust/Barometric Save screws. All units are shipped with the Relief Damper Hood — hoods folded inside the unit in a shipping position. For 48A2,A3,A6,A7 units the hood must be tilted out once the unit CAUTION is installed.

  • Page 31: Step 12 - Route Vav Static Pressure Sensors

    FIELD-FABRICATED WIND BAFFLES Step 12 — Route VAV Static Pressure Sensors VAV DUCT PRESSURE TRANSDUCER — The VAV duct IMPORTANT: Carrier recommends the installation of pressure transducer (VAV inverter pressure transducer) is locat- field-fabricated wind baffles on all vertically oriented ed behind the filter access door on the lower inner panel.
  • Page 32 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 33: Step 14 - Perform Field Modifications

    Step 14 — Perform Field Modifications BACnet Communication Option Wiring DUCTWORK WIRING THE UPC OPEN CONTROLLER TO THE MS/TP NETWORK — The UPC Open controller communicates us- Bottom Return Units (48A2,A3,A6,A7) Field-Modified for ing BACnet on an MS/TP network segment communications Side Return —...
  • Page 34 97.78” (027-050), 150.47” (060) INSIDE DIMENSION 31.25” INSIDE a48-8371 Fig. 46 — Side Return Air Conversion Table 11 — Open System Wiring Specifications and Recommended Vendors WIRING SPECIFICATIONS RECOMMENDED VENDORS AND PART NUMBERS CONTRACTORS CONNECT AIR WIRE TYPE DESCRIPTION INTERNATIONAL BELDEN RMCORP WIRE AND CABLE 22 AWG, single twisted shielded pair, low capacitance, CL2P,...

  • Page 35: Ms/Tp Wiring Recommendations

    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 36: Manufacturer Reserves The Right To Discontinue, Or Change At Any Time, Specifications Or Designs Without Notice And Without Incurring Obligations

    NET+ EIA-485 485-2WIRE Fig. 49 — BT485 Terminator Installation © Carrier Corporation 2019 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480230-01 Printed in U.S.A. Form 48A-20SI...

This manual is also suitable for:

Weathermaker 48a050Weathermaker 48a060

Table of Contents