Goodman GMVM Service Instructions Manual page 39

OPERATION
Y2
Y2
Y2
Remote
Condensing Unit
(Two-Stage Cooling)
Thermostat - Two-Stage Heating with Two-Stage Cooling
IMPORTANT NOTE
S #14 ON
ET DIP SWITCH TO POSITION WHEN USING A
.
COOLING THERMOSTAT
Thermostat Wiring Diagrams
T A
HERMOSTAT PPLICATION
The modulating furnace can be operated with a CTK01 com-
municating thermostat or a CTK02** or CTK03AA communi-
cating-modulating thermostat. It also facilitates operation with
a non-communicating single or two stage heat / cool thermo-
stat.
NOTE: DIP switch #13 (Heating thermostat selection)must
be checked and set regardless of the thermostat chosen.
Factory setting is OFF (single stage), this is also the correct
position if using CTK02** thermostat. To use a CTK01 or a
non-communicating two stage thermostat, set the switch to
the ON position.
Operation with CTK03AA
1. Humidification Options are ON / OFF with the CTK03AA.
When "On" is selected, the humidification relay on the
furnace control board will function during a heat call if a
humidity demand exists. Selecting "Off" means the hu-
midification relay will not function.
2. If the CTK03AA is set up so the compressor off delay is 0
min, it will display a cool / heat call immediately regard-
less of the delay built into the outdoor unit control board.
This means the CTK03AA could show COOL ON when
the outdoor unit is still in a delay period. The recommen-
dation is to set up the compressor delay to at least 3
minutes
3. Dual Fuel – When the CTK03AA calls for gas heat, the
heat pump will shut off, after a delay of approximately 3
minutes it will then turn on gas heat.
4. Dehumidification (lowering of CFM to 85%) only happens
during low stage cooling operation. The dehumidification
feature is not active during high stage cool. The CTK03AA
can be set up to overcool the home in order to reach the
RH set point.
NOTE: In non-communicating installations with a condensing
unit, DIP switch #14 must be checked and set to match a
single or two stage condensing unit. Factory setting is OFF
(single stage).
W1 W2
Furnace Integrated
W1 W2
Control Module
NEU
Dehumidistat
[Optional]
2-
STAGE
24 V D W
OLT EHUMIDISTAT
The optional usage of a dehumidistat allows the furnace's circula-
tor blower to operate at a slightly lower speed (85% of desired
speed) during a combined thermostat call for cooling and dehu-
midistat call for dehumidification. This can be done through an
independent dehumidistat or through a thermostat's DEHUM ter-
minal (if available). This lower blower speed enhances dehumidi-
fication of the conditioned air as it passes through the AC coil.
For proper function, a dehumidistat applied to this furnace must
operate on 24 VAC and utilize a switch which opens on humidity
rise. Refer to the "Thermostat Wiring Diagrams" figure for ad-
ditional wiring details.
To install/connect a dehumidistat:
1. Turn OFF power to furnace.
2. Secure one dehumidistat lead to the terminal marked
"DEHUM" on the furnace integrated control module.
3. Secure the other dehumidistat lead to the terminal marked
"R" on the furnace integrated control module.
4. Secure the dehumidistat ground wire (typically the green
lead) to the ground screw on the furnace junction box.
NOTE: Ground wire may not be present on all
dehumidistats.
5. Turn ON power to furnace.
To enable the dehumidify function on the integrated control mod-
ule, set the dehumidification ENABLE DIP switch from OFF to
ON.
Once the switch is set, the dehumidify function is enabled during
a combination call for cooling (T-Stat) and dehumidification
(DEHUM-Stat). Refer to the DIP switch chart in the back sec-
tion of this manual.
F F A
OSSIL UEL PPLICATIONS
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a com-
bined gas furnace and heat pump installation which uses an out-
door temperature sensor to determine the most cost efficient
means of heating (heat pump or gas furnace).
A heat pump thermostat with three stages of heat is required to
properly use a two-stage furnace in conjunction with a heat pump.
Refer to the fossil fuel kit installation instructions for additional
thermostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit installation
instructions. All furnace connections must be made to the fur-
nace two-stage integrated control module and the "FURNACE"
terminal strip on the fossil fuel control board.
IRING
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