Bryant 574D Instruction Manual download pdf (Page 13)

connections (See Fig. 11). Secure all cut wires, so that they do not

interfere with operation of unit.

POWER

SUPPLY

FIELD-SUPPLIED

FUSED DISCONNECT

HIGH VOLTAGE

POWER LEADS

(SEE UNIT WIRING

LABEL

)

EQUIP GR

3-PHASE SHOWN

1-PHASE USES

TWO POWER

LEADS

CONTROL BOX

SPLICE BOX

LOW-VOLTAGE

POWER LEADS

(SEE UNIT

WIRING LABEL)

WHT(W1)

YEL(Y)

GRN(G)

RED(R)

BRN(C)

THERMOSTAT

(TYPICAL)

BLU(DH)

GRA(Y2)

3-Phase

Only

A09053

Fig. 11 -- High-- and Control--Voltage Connections

Heat Anticipator Setting (Electro--Mechanical

Thermostats

only)

The room thermostat heat anticipator must be properly adjusted to

ensure proper heating performance. Set the heat anticipator, using

an ammeter between the W and R terminals to determine the exact

required setting.

NOTE: For thermostat selection purposes, use 0.18 amp for the

approximate required setting. Failure to make a proper heat

anticipator adjustment will result in improper operation, discomfort

to the occupants of the conditioned space, and inefficient energy

utilization; however, the required setting may be changed slightly

to provide a greater degree of comfort for a particular installation.

Transformer Protection

The transformer is of the energy--limiting type, however a direct

short will likely blow a secondary fuse. If an overload or short is

present, correct overload condition and check for blown fuse on

Indoor Fan board or Integrated Gas Controller. Replace fuse as

required with correct size and rating.

PRE--START--UP

ENVIRONMENTAL, FIRE, EXPLOSION,

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

2. Do not operate compressor or provide any electric power

to unit unless compressor plug is in place and secured.

3. Do not remove ccompressor plug until all electrical

sources are disconnected and tagged.

4. Relieve and recover all refrigerant from system before

touching or disturbing compressor plug if refrigerant

leak is suspected around compressor terminals.

5. Never attempt to repair soldered connection while

refrigerant system is under pressure.

6. Do not use torch to remove any component. System

contains oil and refrigerant under pressure.

To remove a component, wear protective goggles and

proceed as follows:

a. Shut off electrical power to unit and install

lockout tag.

b. Relieve and reclaim all refrigerant from system

using both high-- and low--pressure ports.

c. Cut component connecting tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch

flame.

WARNING

Use the Start--Up Checklist supplied at the end of this book and

proceed as follows to inspect and prepare the unit for initial

start--up:

1. Remove access panels (see Fig. 20).

2. Read and follow instructions on all DANGER, WARNING,

CAUTION, and INFORMATION labels attached to, or

shipped with unit.

3. Make the following inspections:

a. Inspect for shipping and handling damage, such as

broken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and

on unit base. Detecting oil generally indicates a

refrigerant leak.

c. Leak--test all refrigerant tubing connections using

electronic leak detector, or liquid--soap solution. If a

refrigerant leak is detected, see following Check for

Refrigerant Leaks section.

d. Inspect all field-- and factory--wiring connections. Be

sure that connections are completed and tight.

e. Ensure wires do not touch refrigerant tubing or sharp

sheet metal edges.

f. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

574D-- -- A

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Bryant 574D Instruction Manual Page 13

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