Step 4 — electrical controls and wiring, Step 5 — refrigerant circuit – Bryant 604D--A User Manual

Page 26

OF2

OF1

QUIET

SHIFT

120

INTER

TIMER

OFF

DFT

O R

Y C

T2 C C O

DFT

SPEEDUP

Speedup
Pins

Defrost interval
DIP switches

Quiet
Shift

A08020

Fig. 18 -- Defrost Control

Step 4 — Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panels (see Fig. 20) to locate all the electrical

controls and wiring. Check all electrical connections for tightness.
Tighten all screw connections. If any discolored or burned

connections are noticed, disassemble the connection, clean all the
parts, restrip the wire end and reassemble the connection properly

and securely.
After inspecting the electrical controls and wiring, replace all the

panels. Start the unit, and observe at least one complete cooling

cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check

each

electrical

component

with

the

proper

electrical

instrumentation. Refer to the unit wiring label when making these

checkouts.

Step 5 — Refrigerant Circuit

Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a

refrigerant leak.
If oil is detected or if low performance is suspected, leak--test all

refrigerant tubing using an electronic leak detector, or liquid--soap

solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,
refer to Checking and Adjusting Refrigerant Charge section.

C99097

Fig. 19 -- Refrigerant Circuit

604D