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thermostat on an outside wall or any other location
where its operation may be adversely affected by radiant
heat from fireplaces, sunlight, or lighting fixtures, and
convective heat from warm air registers or electrical
appliances. Refer to the thermostat manufacturer's
instruction sheet for detailed mounting information.
Heat / Cool Thermostat
2 - S t ag e H e a t / 2 - S t ag e C o o l T h e r m o s t a t
COPPER WIRE SIZE — AWG
(1% Voltage Drop)
Supply Wire Length-Feet
200
150
100
6
8
10
4
6
4
6
4
4
3
4
3
4
2
3
2
3
2
3
1
2
Wire Size based on N.E.C. for 60° type copper conductors.
Table 3. Copper Wire Size
Thermostat
Wire Gauge
24
22
20
18
Table 4. Thermostat Wire Gauge
THERMOSTAT
G
GREEN
BLACK
C
L
OPTIONAL - SEE NOTE
WHITE
W1
R
RED
BLUE
Y2
NOT USED
NOT USED
YELLOW
Y1
BROWN
W2
DEHUM
To Blower Control Board (Optional)
NOTE:
For use with compatible thermostats only. Refer to the thermostat manual for
detailed installation and programming instructions.
Figure 6. Two Stage Heating / Two Stage
Cooling Configuration
12
Supply Circuit
Ampacity
50
14
15
8
12
20
8
10
25
6
10
30
6
8
35
6
8
40
4
6
45
4
6
50
4
6
55
3
4
60
Recommended T-Stat Wire
Length (Unit to T-Stat)
2-Wire
5-Wire
(Heating)
(Heating/Cooling)
55
25
90
45
140
70
225
110
TERMINAL STRIP
Blower (Auto or Continuous ON)
G
24VAC (Common)
C
Diagnostics
L
1
ST
Stage Heat
W1
R
24VAC
ND
2
Stage Cool
Y2
E
O
1
ST
Stage Cool
Y1
W2
2
ND
Stage Heat
(Recommended): For highest efficiency a 2 Stage
Heating/Cooling thermostat is recommended for this
unit. A 2 Stage Cool thermostat is required for control of
the special variable speed compressor. A 2 Stage Heat
thermostat will allow the gas heat to operate at a more
efficient low heat condition until there is a demand for
higher heat output to the conditioned space.
Single Stage Heat / 2 Stage Cool Thermostat (Optional):
A 2 Stage Cool thermostat is required for control of the
special variable speed compressor. A single stage Heat
thermostat can be used in conjunction with the automatic
heat staging jumper on the ignition control board. The heat
staging function will automatically move the unit into high
heat operation at the time interval selected:
OFF = Low heat operation only and ON = 10 minute delay
from low to high heat mode. See Figure 12 (page 30).
Connect the Red, Yellow, Green, Blue, White, and Brown
(optional) low voltage thermostat wires to terminals R,
Y1 (1st Stage Cool), G, Y2 (2nd Stage Cool), W1 (1st
Stage Heat), & W2 (2nd Stage Heat-optional) on both
the thermostat sub-base and unit low voltage terminal
board. The C terminal (Black wire), is the 24V common
wire required on some thermostat models. See Figures
17 & 18 (pages 34 & 35).
Checking Heat Anticipator Settings
• Add the current draw of the system components.
• Measure the current flow on the thermostat R-W
circuit after the circulating blower motor has started.
Set the heat anticipator according to the thermostat
manufacturer's instructions for heat anticipator settings.
Cooling Configurations
This unit is designed to operate 5 stages of cooling
controlled by any standard 2-stage thermostat. The
connection between Y1 on the thermostat and Y1 on
the unit terminal strip energizes first stage cooling. The
connection bewteen Y2 on the thermostat and Y2 on the
unit terminal strip energizes second stage cooling. The
additional stages are controlled by run time and outdoor
temperature. See Figure 6.
Heating Configurations
This gas pack is factory configured for two stage gas
heating operation with a two stage heating thermostat.
Connect the low voltage thermostat White & brown wires
to W1 & W2, between the unit low voltage terminal board
and thermostat sub-base. See Figure 6.
To operate with a single stage heat thermostat, only
connect the low voltage thermostat White wire between
W1 on the unit low voltage terminal board and thermostat
sub-base. Reposition the automatic heat staging jumper
located on the ignition control module from OFF to ON
to set a 10 minute time delay before the gas furnace will
automatically move to high heat operation.
NOTE: When low fire on the gas valve is energized,
the furnace operates in low fire mode at a lower blower
speed and the timer begins its delay function. If the room
OR
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