Troubleshooting Encoded Two Stage Cooling Thermostats Options - Goodman MBE Series Installation Instructions Manual

WARNING
2 SPD REMOTE
CONDENSING
UNIT
TSTWK01
TRANSFORMER

Troubleshooting Encoded Two Stage Cooling Thermostats Options

INPUT
FROM
THERMOSTAT
POWER
TO
THERMOSTAT
The chart above provides troubleshooting for either version of the encoded thermostat option. This provides diagnostic informa-
tion for the GMC CHET18-60 or a conventional two cool / two stage heat thermostat with IN4005 diodes added as called out in
the above section.
Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE!
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO
MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Y1
Y2
TO COMMON ON
TSTWK01 BOARD
TSTWK01
BOARD
Y/Y2
YLO/Y1
C/X
T
E
S
T
TEST FUNCTION
INDICATION
S1 + LOW SPEED COOL
* S1 - * * LO SPEED COOL *
S1 + - HI SPEED COOL
S2 + LO SPEED HEAT
S2 - O
S2 + - LO SPEED HEAT
HI SPEED HEAT
S3 + G
* S3 - * N/A
* S3 + - * N/A
R + - 24 VAC
COM GND
NOTES:
1.) THE TEST SPADE CAN BE CONNECTED TO ANY OTHER TEST SPADE ON EITHER BOARD.
2.) THE + LED WILL BE RED AND WILL LIGHT TO INDICATE + HALF CYCLES.
THE - LED WILL BE GREEN AND WILL LIGHT TO INDICATE - HALF CYCLES.
BOTH RED AND GREEN ILLUMINATED WILL INDICATE FULL CYCLES DENOTED BY + - .
3.) SIGNAL OUT CONDITION FOR W1 , W2 HEATER WILL BE AFFECTED BY OT1 PJ4 AND OT2 PJ2
JUMPERS AND OUTDOOR THERMOSTATS ATTACHED. THE TABLE ABOVE ASSUMES OT1 PJ4 IS
REMOVED AND OT2 PJ2 IS MADE WITH NO OUTDOOR THERMOSTATS ATTACHED.
DISCONNECT ALL POWER BEFORE SERVICING.
TO Y ON
TSTWK01 BOARD
CHET 18-60
ENCODED
THERMOSTAT
ENCODED THERMOSTAT
PN. B1368271 REV. A
GOODMAN MFG. CO. L.P.
NOTES:
1.) OT2 CLOSED AND W2 DEMAND ENABLES
2ND STG HEAT AND HI FAN
2.) STAT OPENS ON HUMIDITY RISE
3.) DIP SWITCH #4 MUST BE IN THE ON POSITION
ENCODED 2 SPD COOLING - WITH 1 OR 2 STG HEAT - 1 OT
Figure 37
SIGNAL OUT SIGNAL FAN
YCON + Y1
* YCON - * * Y / Y2 HI * * ERROR CONDITION ( DIODE ON THERMOSTAT BACKWARDS )
YCON + - Y / Y2
W1 HEATER W / W1 SEE NOTE 3
ED - O
( FUTURE USE )
W1 HEATER W / W1
SEE NOTE 3
W2 HEATER EM / W2
NONE G
N/A N/A * ERROR CONDITION ( S3 CAN ONLY READ + )
N/A N/A * ERROR CONDITION ( S3 CAN ONLY READ + )
R TO T'STAT R
COM TO T'STAT C1 , C2
22
OUTDOOR
THERMOSTAT
THERMOSTATS HUMIDISTAT
E\W 1 W/W2 OTC OT1 OT2 C R Y1 G Y/Y2 HUM
OUTDOOR
HEATPUMP
O W2 ED Y1
R YCON COM
W1 W2 C R
24 VAC
S
W1 W2
WI
OT1 PJ4 TC
H
OT2 PJ2
HUM PJ6
DI
PLEASE REFER P
O
O
TO MANUAL
FF
N
FOR PROPER
DIP SW ITCH
GOODMAN MFG. CO. L.P.
CONFIGURATION.
2ND STAGE HEATER
1ST STAGE HEATER
CUT OT2 PJ2 FOR THIS CONFIGURATION
CUT HUM PJ6 FOR HUMIDISTAT OPERATION
HUMIDISTAT
(OPTIONAL)
SEE NOTE 2