International comfort products B Series Installation Instructions Manual page 33

INSTALLATION INSTRUCTIONS
NOTE: Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft. (30.5 M). 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. fuse of identical
size. (See Figure 40)
See the Service and Technical Support manual for detailed
instructions on control wiring and setup.
Thermostats and Control Settings for
N9MSB Single−Stage Furnaces
A single stage heating and single−stage cooling thermostat
may be used with the furnace. Refer to typical thermostat wiring
diagrams and the Sequence of Operation section of the
Service and Technical Support manual for details on
configuring the furnace control board. Consult the thermostat
installation instructions for
configuring the thermostat.
Accessories
(See Figure 39 and/or Figure 40)
1. Electronic Air Cleaner (EAC):
Connect an accessory Electronic Air Cleaner (if used)
using 1/4−in female quick connect terminals to the two
male 1/4−in quick−connect terminals on the control
board marked EAC and NEUTRAL. The terminals are
rated for 115 VAC, 1.0 amps maximum and are
energized during blower motor operation.
Figure 40)
2. Humidifier (HUM 24VAC and HUM)
S
a. HUM 24VAC: Connect an accessory 24 VAC, 0.5
amp maximum humidifier (if used) to the 1/4−in male
quick−connect HUM 24VAC terminal and C screw
Table 11 Electrical Data
VOLTS−
HERTZ−
UNIT SIZE PHASE
0401410 115-60-1
0401712 115-60-1
0601412 115-60-1
0601716 115-60-1
0801716 115-60-1
0802120 115-60-1
1002116 115-60-1
1002122 115-60-1
1202422 115-60-1
* Permissible limits of the voltage range at which the unit operates satisfactorily.
# Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full load
amps.
{ Time−delay type is recommended.
} Length shown is as measured one way along wire path between unit and service panel for maximum 2 percent voltage drop.
440 01 4102 01
specific information about
(See
N9MSB SINGLE−STAGE, PSC BLOWER FURNACES
OPERATING VOLTAGE
RANGE* MAXIMUM
UNIT
Maximum* Minimum*
AMPS
127 104 5.2
127 104 7.4
127 104 5.3
127 104 7.5
127 104 8.1
127 104 8.9
127 104 7.3
127 104 14.6
127 104 14.9
Specifications subject to change without notice.
terminal on the control board thermostat strip. The
HUM 24VAC terminal is energized when there is a call
for heat (W) and the pressure switch (LPS) closes.
(See Figure 40)
S
b. HUM: Connect an accessory 115VAC (EAC and
HUM are 1 amp maximum combined) humidifier (if
used) to the ¼−inch male quick connect HUM terminal
and NEUTRAL ¼−inch quick connect. The HUM
terminal is energized when the inducer motor is
energized (IDR). (See Figure 40)
NOTE: A field−supplied, 115−v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.
NOTE: DO NOT connect furnace control HUM 24VAC terminal
to H (humidifier) terminal on humidity sensing thermostat, or
similar device. See humidity sensing thermostat, thermostat, or
controller manufacturer's instructions for proper connection.
Alternate Power Supplies
This furnace is designed to operate on a utility generated
power which has a smooth sinusoidal waveform. If the furnace
is to be operated on a generator or other alternate power
supply, the alternate power supply must produce a smooth
sinusoidal waveform for compatibility with furnace electronics.
The alternate power supply must generate the same voltage,
phase, and frequency (Hz) as shown in Table 11 or on the
furnace rating plate.
Power from an alternate power supply that non-sinusoidal may
damage the furnace or cause erratic furnace operation.
Contact the alternate power
specifications and details.
MINIMUM
WIRE
UNIT
SIZE
AMPACITY#
AWG
7.5 14
10.3 14
7.6 14
10.4 14
11.1 14
12.1 14
10.1 14
19.2 12
19.6 12
Gas Furnace: N9MSB
supply manufacturer
MAXIMUM
MAXIMUM
FUSE OR CKT
WIRE LENGTH
BKR
FT (M)}
AMPS{
49 (14.9) 15
36 (11.0) 15
48 (14.6) 15
35 (10.7) 15
33 (10.1) 15
30 (9.1) 15
36 (11.0) 15
29 (8.8) 20
29 (8.8) 20
33
for