Table of Contents
Advertisement
Electrical Wiring
Risk of electrical shock. Disconnect electrical power
at the circuit breaker or service panel before making
electrical connections. Failure to disconnect power
supplies can result in property damage, personal injury,
or death.
The furnace must be grounded and wired in accordance
with local codes or, in the absence of local codes, with the
National Electrical Code ANSI/NFPA No. 70 (latest edition)
and/or CSA C22.1 Electrical Code (latest edition) if an
external electrical source is utilized.
In all instances, other than wiring for the thermostat,
the wiring to be done and any replacement of wire shall
conform with the temperature limitation for Type T wire
–63°F (35°C) rise.
Connect a sufficiently sized wire with ground to the
furnace's line voltage connections and ground wire. Refer
to the furnace rating plate for electrical characteristics
to be used in sizing field supply wiring and overcurrent
protection.
The line voltage supply should be routed through a readily
accessible disconnect located within sight of the furnace. A
junction box on the furnace side panel is provided for line
voltage connections. Refer to the furnace wiring diagram
for specific connection information.
Proper polarity of the supply connections ("HOT" and
"NEUTRAL") must be observed to ensure that safety
controls provide the protection intended.
A connection to the unit's ground wire and actual earth
ground (typically a ground stake or buried steel pipe) must
be maintained for proper operation.
Thermostat
Install a room thermostat according to the instructions
furnished with it. Select a location on an inside wall that
is not subject to drafts, direct sunshine, or other heat
sources. The initial heat anticipator setting should be equal
to the total current draw of the control circuit. Low voltage
thermostat connections are to be made to the integrated
ignition/blower control board as indicated on the wiring
diagram.
Single Stage Thermostat Operation (80G2UH-V)
The automatic heat staging option allows a single stage
thermostat to be used with two stage furnace models
(80G2UH-V). To activate this option, move the jumper
pin (see Figure 32) to desired setting (5 minutes or 10
minutes). The furnace will start on 1st stage heat and
Page 26 of 39
WARNING
stay at 1st stage heat for the duration of the selected time
before switching to 2nd stage heat.
W1 on the control board must be connected to W1 on the
thermostat.
Figure 32. Automatic Heat Staging Jumper
Humidifier
Terminals are provided on the integrated ignition/blower
control board for connection to a 120-volt humidifier. The
"HUM" terminal is energized whenever the thermostat
calls for heat. See the furnace wiring diagram for specific
connection information.
Electronic Air Cleaner
Terminals are provided on the integrated ignition/blower
control board for connection of a 120-volt electronic air
cleaner. The "EAC" terminal is energized whenever the
thermostat calls for heat, cooling, or continuous blower. See
furnace wiring diagram for specific connection information.
Variable Speed Features
This furnace is equipped with a variable speed circulation
air blower motor that will deliver a constant airflow within a
wide range of external static pressures. Other features of
this variable speed motor include:
Soft Start
The variable speed motor will slowly ramp up to normal
operating speed. This minimizes noise and increases
comfort by eliminating the initial blasts of air encountered
with standard motors.
Soft Stop
At the end of a cooling or heating cycle, the variable speed
motor will slowly ramp down after a short blower "off" delay.
If continuous blower operation has been selected, the
variable speed motor will slowly ramp down until it reaches
the airflow for that mode.
Issue 2302
507335-03
Advertisement
Table of Contents
