Component Operation & Testing; Compressors - Heat Controller BG-81G Service Manual

Service Manual
 Fault Code
Defect code
Evaporator de-frosting defect.
Ed
Indoor ambient temperature sensor failure in heating, cooling, dry and auto
AS
mode.
DAHT sensor failure in heating mode.
HS
LO Sensor disconnection malfunction in fan only mode
Sensor short circuit malfunction in fan only mode
HI
6. COMPONENT OPERATION & TESTING
WARNING:
DISCONNECT THE POWER CORD FROM THE POWER PLUG BEFORE SERVICING OR
TESTING.

6.1 COMPRESSORS

Compressors are single phase, 115 or 230/208 volt, depending on the model number. All
compressor motors are permanent split capacitor type using only a running capacitor across
the start and run terminal.
All compressors are internally spring mounted and externally mounted on rubber isolators.
COMPRESSOR WINDING TEST (See Figure 1)
Remove compressor terminal box cover and disconnect
wires from terminals. Using an ohmmeter, check
continuity across the following:
1. Terminal "C" and "S" - no continuity
- open winding - replace compressor.
2. Terminal "C" and "R" - no continuity
- open winding - replace compressor.
3. Terminal "R" and "S" - no continuity
- open winding - replace compressor.
GROUND TEST
Use an ohmmeter set on its highest scale. Touch
one lead to the compressor body (clean point of
contact as a good connection is a must) and the
other probe in turn to each compressor terminal
(see Figure 2.) If a reading is obtained, the
compressor is grounded and must be replaced.
Room Air Conditioner with R-410A
Defect explanation
Figure 1: Compressor winding test
9
Heat Controller, Inc.
Figure 2: Typical ground test