Goodman GMVM Service Instructions Manual page 38

OPERATION
To ensure proper unit grounding, the ground wire should run
from the furnace ground screw located inside the furnace junc-
tion box all the way back to the electrical panel. NOTE: Do not
use gas piping as an electrical ground. To confirm proper unit
grounding, turn off the electrical power and perform the following
check.
1. Measure resistance between the neutral (white) con-
nection and one of the burners.
2. Resistance should measure 10 ohms or less.
This furnace is equipped with a blower door interlock switch which
interrupts unit voltage when the blower door is opened for servic-
ing. Do not defeat this switch.
24 V T W
OLT HERMOSTAT IRING
IMPORTANT NOTE
W
IRE ROUTING MUST NOT INTERFERE WITH CIRCULATOR BLOWER
,
OPERATION FILTER REMOVAL OR ROUTINE MAINTENANCE
A
REMOVABLE PLUG CONNECTOR IS PROVIDED WITH THE CONTROL TO
MAKE THERMOSTAT WIRE CONNECTIONS
WIRE CONNECTIONS MADE TO THE PLUG
STRONGLY
RECOMMENDED THAT MULTIPLE WIRES INTO A SINGLE
TERMINAL BE TWISTED TOGETHER PRIOR TO INSERTING INTO THE PLUG
. F
CONNECTOR AILURE TO DO SO MAY RESULT IN INTERMITTENT
.
OPERATION
IMPORTANT NOTE
D #13 MUST
IP SWITCH BE SET TO MATCH THERMOSTAT TYPE
CTK01
THE COMMUNICATING THERMOSTAT
ON . T
SET TO POSITION HIS IS ALSO THE CORRECT SETTING FOR A NON
2-
COMMUNICATING STAGE THERMOSTAT
,
MODULATING THERMOSTAT CHECK TO MAKE SURE DIP SWITCH
OFF (
IN THE POSITION FACTORY POSITION
POSITION WHEN USING A NON
.
THERMOSTAT
When installed with a non-communicating thermostat, the fur-
nace integrated control module provides terminals for both "W1"
and "W2", and "Y1" and "Y2" thermostat connections. This allows
the furnace to support the following system applications: 'Two-
Stage Heating Only', 'Two-Stage Heating with Single Stage Cool-
ing', and 'Two-Stage Heating with Two-Stage Cooling'. Refer to
the following figures for proper connections to the integrated con-
trol module.
Low voltage connections can be made through either the right or
left side panel. Thermostat wiring entrance holes are located in
the blower compartment. The following figure shows connections
for a "heat/cool system".
This furnace is equipped with a 40 VA transformer to facilitate use
with most cooling equipment. Consult the wiring diagram, lo-
cated on the blower compartment door, for further details of 115
Volt and 24 Volt wiring.
NOTE: Use of ramping profiles requires a jumper between Y1
and O.
38
.
. T
HIS PLUG MAY BE REMOVED
, . I
AND REPLACED T IS
, #13
DIP SWITCH
. T CTK02**
O USE
). T
HIS IS ALSO THE CORRECT
- -
COMMUNICATING SINGLE STAGE
T "R"
HERMOSTAT
C A
OMFORT LERT
C N
THE OMFORT
24 V THERMOSTAT CONNECTIONS
Low Voltage Connections with Auxiliary Terminals
The auxiliary contacts are shipped with a factory installed
jumper. As an option, the auxiliary contacts may be wired to
a normally closed float switch. In the event of open contacts,
the furnace will be disabled until the condition is corrected.
These are 24 volt terminals fed internally, do not apply another
voltage source to these terminals.
,
Y
Remote
Condensing Unit
(Single-Stage Cooling)
. T
O USE
MUST BE
-
Thermostat - Single-Stage Heating with Single-Stage Cooling
#13
IS
T
O APPLY A SINGLE
SELECTOR SWITCH ON THE
-
SET ON SINGLE STAGE
_________________________________
Y
Remote
Condensing Unit
(Single-Stage Cooling)
Thermostat - Two-Stage Heating with Single-Stage Cooling
IMPORTANT NOTE
REQUIRED IF OUTDOOR UNIT IS EQUIPPED WITH A
™
MODULE OR IF THE OUTDOOR UNIT IS A PART OF
™ .
ET FAMILY OF EQUIPMENT
R
R
NEU
C
Dehumidistat
[Optional]
IMPORTANT NOTE
- H T
STAGE EATING HERMOSTAT
I C
NTEGRATED ONTROL
.
R
R
C NEU
Dehumidistat
AUX
Furnace Integrated
Control Module
,
THE THERMOSTAT
M MUST
ODULE BE
____
Furnace Integrated
Control Module
[Optional]