If manual disconnect switch is to be mounted on furnace,
select a location where a drill or fastener will not contact
electrical or gas components. Failure to follow this caution
will result in minor unit operation or performance satisfac-
tion.
Step 2—24-v Wiring
Make field 24-v thermostat connections at 24-v terminal block on
furnace control. For proper cooling operation, Y wire from
thermostat MUST be connected to Y terminal on furnace control,
as shown in Fig. 30. The 24-v terminal block is marked for easy
connection of field wiring. (See Fig. 32.) The 24-v circuit contains
a 3-amp, automotive-type fuse located on furnace control. (See
Fig. 33.) Any electrical shorts of 24-v wiring during installation,
service, or maintenance may cause fuse to blow. If fuse replace-
ment is required, use only a fuse of identical size (3 amp) and type.
The control will flash code 24 when fuse needs replacement.
NOTE: Use AWG No. 18 color-coded copper thermostat wire for
lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.
Step 3—Accessories
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2 are
provided for EAC connection. (See Fig. 33.) These terminals
are energized with 115v (1.0-amp maximum) during blower
motor operation.
NOTE: DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat™, Zone Controller or simi-
lar device. See Thermidistat™, Zone Controller, thermostat, or
controller manufacturer’s instructions for proper connection.
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (C
OM
24-v) are provided for 24-v humidifier connection. (See Fig.
33.) HUM terminal is energized with 24v (0.5-amp maximum)
when gas valve is energized.
Table 4—Electrical Data
UNIT
SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAX
UNIT
AMPS
UNIT
AMPACITY†
MIN
WIRE
SIZE
MAX WIRE
LENGTH (FT)‡
MAX FUSE OR
CKT BKR AMPS**
Max* Min*
040-08 115—60—1 127 104 6.1 8.4 14 44 15
040-12 115—60—1 127 104 7.3 10.0 14 37 15
060-08 115—60—1 127 104 6.1 8.4 14 44 15
060-12 115—60—1 127 104 7.1 9.8 14 38 15
060-16 115—60—1 127 104 9.5 12.8 14 29 15
080-12 115—60—1 127 104 7.6 10.4 14 36 15
080-16 115—60—1 127 104 10.0 13.4 14 28 15
080-20 115—60—1 127 104 14.1 18.4 12 31 20
100-16 115—60—1 127 104 10.2 13.5 14 27 15
100-20 115—60—1 127 104 14.8 19.3 12 30 20
120-20 115—60—1 127 104 14.6 19.1 12 30 20
* Permissible limits of voltage range at which unit will operate 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.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay type is recommended.
Table 5—Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials
ASTM SPECIFICATION
(MARKED ON MATERIAL)
MATERIAL PIPE FITTINGS SOLVENT CEMENT AND PRIMERS DESCRIPTION
D1527 ABS Pipe —— Schedule-40
D1785 PVC Pipe —— Schedule-40
D2235 For ABS ——
Solvent
Cement
For ABS
D2241 PVC Pipe —— SDR-21 & SDR-26
D2466 PVC — Fittings — Schedule-40
D2468 ABS — Fittings — Schedule-40
D2564 For PVC ——
Solvent
Cement
For PVC
D2661 ABS Pipe Fittings — DWV at Schedule-40 IPS sizes
D2665 PVC Pipe Fittings — DWV
F438 CPVC — Fittings — Schedule-40
F441 CPVC Pipe —— Schedule-40
F442 CPVC Pipe —— SDR
F493 For CPVC ——
Solvent
Cement
For CPVC
F628 ABS Pipe ——Cellular Core DWV at Schedule-40 IPS sizes
F656 For PVC —— Primer For PVC
F891 PVC Pipe —— Cellular Core Schedule-40 & DWV
24
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