Carrier 48/50HJ004-014 - Manual

Carrier 48/50HJ004-014

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Table of Contents:

  • Page 2 – File a claim with the; Step 2 — Provide Unit Support; Deck pans; S u p p l y; SIDE VIEW; R1 = Return from building to HVAC
  • Page 3 – Step 3 — Field Fabricate Ductwork —; Secure all; Supply
  • Page 6 – Step 4 — Rig and Place Unit —; Flue vent discharge must have a minimum horizontal clear-; HVAC UNIT; Fig. 4 — Supplemental Energy Recovery Section Equipment Support; UNIT SIZE
  • Page 11 – Step 8 — Make Electrical Connections
  • Page 13 – Pass the control wires through the hole provided in the cor-
  • Page 27 – LEGEND; Fig. 7 — Power Wiring Connections; Contactor; COMP —; Compressor; IFC; National Electrical Code; TB; Terminal Block
  • Page 28 – Fig. 8 — Light Commercial Thermidistat
  • Page 29 – Fig. 11 — Energy Recovery Section Supply-Air Hood Assembly
  • Page 30 – Fig. 13 — Light Commercial; Fig. 14 — Light Commercial Thermidistat
  • Page 31 – Step 3 — Install Light Commercial Thermidistat
  • Page 36 – ROOFTOP UNIT; ENERGY RECOVERY; Fig. 17 — Unit Operation Flow Diagram
  • Page 38 – TROUBLESHOOTING; Use Tables 3 and 4, and Fig. 19 and 20 when troubleshooting this unit.
  • Page 40 – PremierLink; COMMS —; Communications; OAT; Outdoor Air Temperature Sensor; PWR; Power; SAT; Supply Air Temperature Sensor; Fig. 20 — Typical Wiring Schematic (with PremierLinkTM Controls)
  • Page 43 – COMBINED ELECTRICAL (COBRA ENERGY RECOVERY UNIT)
  • Page 44 – IV. LIGHT COMMERCIAL THERMIDISTAT ACCESSORY
Loading the manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

PC 111

Catalog No. 534-80122

Printed in U.S.A.

Form 48/50HJ,62AQ-2SIS

Pg 1

9-02

Replaces: 48/50HJ,62AQ-1SIS

Book 1

1

4

4

Tab

1a 1b 6a 6b

Installation, Star t-Up,

and Service Supplement

CONTENTS

Page

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . 1

GENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

Step 1 — Inspect Shipment

. . . . . . . . . . . . . . . . . . . . . . 2

Step 2 — Provide Unit Support

. . . . . . . . . . . . . . . . . . . 2

• ROOF CURB

Step 3 — Field Fabricate Ductwork

. . . . . . . . . . . . . . . 3

Step 4 — Rig and Place Unit

. . . . . . . . . . . . . . . . . . . . . 6

• POSITIONING

Step 5 — Install Flue Hood (48HJ Only)

. . . . . . . . . 11

Step 6 — Install Gas Piping (48HJ Only)

. . . . . . . . . 11

Step 7 — Install External Trap for Condensate

Drain

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Step 8 — Make Electrical Connections

. . . . . . . . . . 11

• FIELD POWER SUPPLY
• FACTORY-SUPPLIED NON-FUSED

DISCONNECT

• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS

Step 9 — Assemble and Mount

Supply-Air Hood

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Step 10 — Mount the Barometric Relief Damper

. . 28

Step 11 — Set the Outdoor Cooling and

Heating Thermostats

. . . . . . . . . . . . . . . . . . . . . . . . . . 29

LIGHT COMMERCIAL THERMIDISTAT

ACCESSORY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-34

General

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Power

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Dehumidification Equipment and Connections

. . . 30

Step 1 — Select Light Commercial

Thermidistat Location

. . . . . . . . . . . . . . . . . . . . . . . . . 30

Step 2 — Set DIP Switches

. . . . . . . . . . . . . . . . . . . . . . . 30

Step 3 — Install Light Commercial Thermidistat

. . 31

Step 4 — Set Light Commercial Thermidistat

Configuration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Step 5 — Conduct Light Commercial

Thermidistat Start-Up and Checkout

. . . . . . . . . . . 33

Step 6 — Make Final Settings

. . . . . . . . . . . . . . . . . . . . 34

OPERATIONAL INFORMATION

. . . . . . . . . . . . . . . . . . 34

PRE-START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-37

TROUBLESHOOTING

. . . . . . . . . . . . . . . . . . . . . . . . . 38-41

ROOFTOP UNIT AND ENERGY$RECYCLER2

START-UP CHECKLIST

. . . . . . . . . . . . . . . . CL-1, CL-2

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
install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func-

tions 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 precau-
tions in the literature, tags and labels attached to the unit, and
other safety precautions that apply.

Verify that the power source supplied to the unit matches

the voltages and amperages listed on the unit rating plate.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.

GENERAL

Carrier’s factory-installed optional COBRA Energy Recov-

ery units precondition ventilation air for the rooftop unit during
winter and summer operation and recover energy from the
building exhaust air. These units are designed to satisfy the
higher ventilation requirements and other building codes while
minimizing energy costs.

Factory installation of the energy recovery section provides

the benefit of reduced field-installation time, single point pow-
er connections, and the assurance of a factory test for the com-
plete COBRA Energy Recovery unit. The energy recovery sec-
tion requires less maintenance than other energy recovery
systems and can be serviced by any qualified refrigeration
technician.
NOTE: Because of the location of the energy recovery section,
the unit nameplate has been moved to the opposite end of the
rooftop section, on the upper, right-hand part of the panel.

IMPORTANT: This is a supplemental instruction for the
48/50HJ and the 62AQ Installation, Start-Up and Service
Instructions. It is not intended to take the place of either
instruction or to be a complete piece in itself.

Disconnect gas piping from unit when leak
testing at pressure greater than

1

/

2

psig. Pres-

sures greater than

1

/

2

psig will cause gas

valve damage resulting in hazardous condi-
tion. If gas valve is subjected to pressure
greater than

1

/

2

psig, it must be replaced

before use. When pressure testing field-
supplied gas piping at pressures of

1

/

2

psig or

less, a unit connected to such piping must be
isolated by manually closing the gas valve.

Before performing service or maintenance operations on
unit, turn off main power switch to unit and install a lock-
out tag. Electrical shock could cause personal injury.

COBRA™ Energy Recovery Units

48/50HJ004-014 with 62AQ060-300

Single-Package Rooftop Units

with Energy Recovery Capability

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Summary

Page 2 - File a claim with the; Step 2 — Provide Unit Support; Deck pans; S u p p l y; SIDE VIEW; R1 = Return from building to HVAC

2 INSTALLATION Step 1 — Inspect Shipment — File a claim with the shipping company if shipment is incomplete or damaged. SeeFig. 1 for a typical shipping packaging for a COBRA™ energyrecovery unit. Step 2 — Provide Unit Support ROOF CURB — The COBRA energy recovery unit can use afull-perimeter roof c...

Page 3 - Step 3 — Field Fabricate Ductwork —; Secure all; Supply

3 If electric control power or gas service is to be routed through the basepan, a field-installed accessory thru-the-bottom connection must be used. Attach the accessory to thebasepan per the information in the accessory installationinstructions. Thru-the-bottom connections must be installedbefore u...

Page 6 - Step 4 — Rig and Place Unit —; Flue vent discharge must have a minimum horizontal clear-; HVAC UNIT; Fig. 4 — Supplemental Energy Recovery Section Equipment Support; UNIT SIZE

6 Step 4 — Rig and Place Unit — Keep unit upright and do not drop. Spreader bars are not required if top crating isleft on unit. Rollers may be used to move unit across a roof.Remove the bottom wooden skids that are under the unit byremoving the wooden plates that hold the bottom woodenframe to the ...

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