Grounding - Heat Controller 80+ AFUE Installation Instructions Manual

IMpORTANT NOTES:
• An electrical disconnect must be installed readily
accessible from and located within sight of the
furnace. See Figure 14 or the wiring diagram label
inside of the control door.Any other wiring methods
must be acceptable to authority having jurisdiction.
• Proper line voltage polarity must be maintained in
order for the control system to operate correctly.
Verify the incoming neutral line is connected to the
white wire and the incoming "hot" line is connected
to the black wire.The furnace will not operate unless
the polarity and ground are properly connected as
shown in Figure 14.
• If replacing any of the original wires supplied with
the furnace, the replacement wire must be copper
wiring and have a temperature rating of at least 105°
Furnace
Furnace Models
GUH80A & GDD80A
045A3XE 45,000
054A3XE 54,000
072B4XE 72,000
072C5XE 72,000
090B4XE 90,000
090C5XE 90,000
108C5XE 108,000
126D5XE 126,000
Thermostat Wire Gauge
24
22
20
18
*
Time-delay fuses or circuit breakers are required.
Black (Hot)
White (Neutral)
Green or Bare
(Ground)
Field Line Voltage Wiring
Factory Line Voltage Wiring
20
Cabinet Nominal
Input Width Electrical
(Btuh) (in.) Supply
14 1/4 115-60-1
14 1/4 115-60-1
17 1/2 115-60-1
21 115-60-1
17 1/2 115-60-1
21 115-60-1
21 115-60-1
24 1/2 115-60-1
Table 2. Wire Length & Voltage Specifications
Field Supplied Field Supplied
Fused Service Disconnect w/in
Panel Sight of Furnace
Black
White
Ground
Figure 14. Line Voltage Field Wiring
F (40° C). For electrical specifications, refer to the
furnace nameplate or Table 2.

Grounding

To minimize personal injury,the furnace cabinet
must have an uninterrupted or unbroken
electrical ground. The controls used in this
furnace require an earth ground to operate
properly.Acceptable methods include electrical
wire or conduit approved for ground service.
Do not use gas piping as an electrical ground!
Maximum Minimum
Operating Operating
Voltage Voltage
127 103
127 103
127 103
127 103
127 103
127 103
127 103
127 103
Recommended Thermostat Wire Length
2 - wire - Heating
55 ft.
90 ft.
140 ft.
225 ft.
Junction Box (may be int. or ext. to the furnace). These
connections can be made in the field supplied disconnect
at the furnace. NOTE: Connections made within the furnace
burner compartment do not require a junction box.
Black
White
Ground
Field Supplied
Panel Connector
wARNING:
Maximum Minimum
Fuse or Circuit
Furnace wire
Amperes Gauge
Breaker Amps
6.3 14
6.3 14
9.7 14
9.0 14
9.7 14
9.0 14
15.2 12
15.2 12
4 or 5 wire - Cooling
25 ft.
45 ft.
70 ft.
110 ft.
Black
White
Ground
Maximum
*
15
15
20
15
20
15
30
30