International comfort products R9MSB0801716 Installation Instructions Manual page 34

INSTALLATION INSTRUCTIONS
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON
MONOXIDE POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, personal injury, death, or property damage.
Do no drill into blower shelf of furnace to route control wiring.
Route any control or accessory wiring to the blower
compartment through external knockouts on the casing.
24−V Wiring
Make field 24−v connections at the 24−v terminal strip. (See
Figure 40.) Use only AWG No. 18, color−coded, copper
thermostat wire.
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.
Accessories
(See Figure 38 and 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
VOLTS−
HERTZ−
UNIT SIZE PHASE
0601716B 115−60−1
0801716A 115−60−1
0801716B 115−60−1
1002120B 115−60−1
1202420B 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 furnace and service panel for maximum 2 percent voltage drop.
34
Table 10 – Electrical Data
OPERATING VOLTAGE
RANGE* MAXIMUM
Maximum* Minimum*
127 104
127 104
127 104
127 104
127 104
Specifications subject to change without notice.
board marked EAC−1 and EAC−2. The terminals are
rated for 115VAC, 1.0 amps maximum and are energized
during blower motor operation.
2. Humidifier (HUM)
The HUM terminal is a 24 VAC output, energized when
the LPS closes during a call for heat.
Connect an accessory 24 VAC, 0.5 amp. maximum
humidifier (if used) to the ¼−in. male quick−connect HUM
terminal and COM−24V screw terminal on the control
board thermostat strip. (See Figure 40.)
NOTE: If the humidifier has its own 24 VAC power supply, an
isolation relay may be required. Connect the 24 VAC coil of the
isolation relay to the HUM and COM/24V screw terminal on the
control board thermostat strip. (See Figure 38.)
Alternate Power Supplies
This 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, the
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 Table 10 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
specifications and details.
MINIMUM
UNIT
UNIT
AMPACITY#
AMPS
8.6 11.7
8.1 11.1
8.1 11.1
11.9 15.8
11.9 15.8
Gas Furnace: R9MSB
power supply manufacturer
MAXIMUM MAXIMUM
WIRE WIRE FUSE OR
SIZE LENGTH CKT BKR
AWG FT (M)} AMPS{
14 351(9.4)
14 33 (10.1)
14 33 (10.1)
12 36 (11.0)
12 36 (11.0)
440 01 6001 05
for
15
15
15
20
20