19
Figure 15 Power cord installation in the furnace
7.2- 24 V WIRING
Make field 24 V connections at the 24 V terminal strip.
Connect terminal
Y/Y2
for proper cooling operation. Use only AWG No. 18, color-coded,
copper thermostat wire.
NOTE
: Use AWG No. 18 color coded copper thermostat wire for lengths
up to 100ft. (30.5m). For wire lengths over 100 ft., use AWG No
16 wire.
The 24 V circuit contains an automotive type, 3-amp fuse located on the
control. Any direct shorts during installation, service, or maintenance could
cause this fuse to blow. If fuse replacement is required, use
ONLY
a 3
amp.
7.3- THERMOSTATS
Thermostats and Control Settings for Two Stage Furnaces.
A single stage or two stage heating and single stage or two stage cooling
thermostat may be used with the furnace. Consult the thermostat
installation instructions for specific information about configuring the
thermostat.
Thermostats and Control Settings for Single Stage furnaces.
A single stage heating and single stage or two stage cooling thermostat
may be used with the furnace. Consult the thermostat installation
instructions for specific information about configuring the thermostat.
7.4-
ALTERNATE POWER SUPPLY
The furnace is designed to operate on utility generated power which has
a smooth sinusoidal waveform. If the furnace is to be operated on a
generator or other alternate power supply must produce a smooth
sinusoidal waveform for compatibility with the furnace electronics. The
alternate power supply must generate the same voltage, phase, and
frequency (Hz) as shown in or the furnace rating plate.
Power from an alternate power supply that is non-sinusoidal may damage
the furnace electronics or cause erratic operation.
Contact the alternate power supply manufacturer for specifications and
details
.
7.5- BLOWER SPEEDS (4 SPEED PSC MOTOR)
Furnace with model number CXX-1-D and CXX-2-D are equipped with a
multi-speed circulator blower. This blower provides ease in adjusting
blower speeds. See airflow tables in annexe for the relation between CFM
and external static pressure applicable to your model. The cooling and
heating blower speed are shipped with the suggested fan speed describe
in table 9 and table 10. These blower speeds are set for a temperature
rise of 55°F. Blowers should be adjusted by the installer to match the
installation requirements so as to provide the correct heating temperature
rise and cooling load. To adjust the circulator blower speed, proceed as
follow:
1.
Turn off the power to the furnace
2.
Select the heating and cooling blower speeds that match the
installation requirements from the airflow tables in annexe.
3.
Relocate the desired motor leads to the desire speed on the
motor.
4.
If heating and cooling speeds are the same, a jumper wire must
be used between the heat and cool terminal on the control
board
. The unused leads must be connected to the “PARK”
terminal on the control board.
5.
Turn on power to the furnace.
6.
Verify proper temperature rise. Excessive temperature rise can
cause limit switch tripping.
Table 9 : Suggested fan speed on 1 stage furnace
INPUT
HEATING
COOLING
45,000
LOW
MED-HIGH
60,000
MED-LOW
MED-HIGH
75,000
MED-LOW
MED-HIGH
105,000
HIGH
MED-HIGH
120,000
HIGH
MED-HIGH
Table 10 : Suggested fan speed on 2 stage furnace
INPUT
HEATING 1
st
STAGE
HEATING 2
nd
STAGE
COOLING
45,000
LOW
MED-LOW
MED-HIGH
60,000
LOW
MED-LOW
MED-HIGH
75,000
LOW
MED-LOW
MED-HIGH
105,000
LOW
MED-HIGH
MED-LOW
120,000
MED-LOW
HIGH
MED-HIGH
Summary of Contents for c105-1-d
Page 20: ...20 Figure 16 Wiring diagram One stage PSC ...
Page 21: ...21 Figure 17 Two Stage PSC Furnace Control ...
Page 22: ...22 Figure 18 Two Stage ECM Furnace Control ...
Page 26: ...26 Figure 21 Direct venting Figure 22 Multi venting ...
Page 37: ...37 Figure 25 Part list 1 Stage PSC ...
Page 38: ...38 Figure 26 Part list 1 Stage PSC continued ...
Page 41: ...41 Figure 27 Part list 2 Stage PSC ...
Page 42: ...42 Figure 28 Part list 2 stage PCS continued ...
Page 45: ...45 Figure 29 Part list X13 ...
Page 46: ...46 Figure 30 Part list X13 continued ...
Page 49: ...49 Figure 31 Part list 2 Stage ECM ...
Page 50: ...50 Figure 32 Part list 2 Stage ECM continued ...