035-19624-001 Rev. A (0104)
Unitary Products Group
9
IMPORTANT:
Some electronic thermostats do not have adjustable
heat anticipators. They may have other type cycle rate adjustments.
Follow the thermostat manufacturer's instructions.
The 24-volt, 40 VA transformer is sized for the furnace components
only, and should not be connected to power auxiliary devices such as
humidifiers, air cleaners, etc. The transformer may provide power for an
air conditioning unit contactor.
ACCESSORY CONNECTIONS
The furnace control will allow power-switching control of various acces-
sories. Refer to Figure 12, for connection details.
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4” (6.4 mm) spade terminals (EAC and EAC N) for electronic air
cleaner connections are located on the control board. The terminals
provide 115 VAC (1.0 amp maximum) during circulating blower opera-
tion.
HUMIDIFIER CONNECTION
Two 1/4” (6.4 mm) spade terminals (HUM and HUM N) for humidifier
connections are located on the control board. The terminals provide 115
VAC (1.0 amp maximum) during heating system operation.
SECTION VI: COMBUSTION AIR AND
VENT SYSTEM
COMBUSTION AIR AND VENT SAFETY
This Category IV, dual certified direct vent furnace is designed for resi-
dential application. It may be installed without modification to the con-
densate system in a basement, garage, equipment room, alcove, attic
or any other indoor location provided the space temperature is 32 °F
(0°C) or higher and where all required clearance to combustibles and
other restrictions are met. The combustion air and the venting system
must be installed in accordance with Section 5.3, Air for Combustion
and Ventilation, of the National Fuel Gas Code Z223.1/NFPA 54 (latest
edition), or Sections 7.2, 7.3 or 7.4 of CSA B149.1, National Gas and
Propane Codes (latest edition) or applicable provisions of the local
building code and these instructions.
IMPORTANT:
The “VENT SYSTEM” must be installed as specified in
these instructions for Residential and Non HUD Modular Homes. The
sealed combustion air / vent system is the only configuration that can
be installed in a Non HUD Modular Home.
FIGURE 10:
Field Wiring for Single Stage Thermostat
FIGURE 11:
Field Wiring for Two Stage Thermostat
Set the heat anticipator in the room thermostat as shown below. Set-
ting it lower will cause short cycles. Setting it higher will cause the
room temperature to exceed the setpoint.
Two-Stage Thermostat
First Stage
.4 Amps
Second Stage
.1 Amps
Single Stage Thermostat
.4 Amps
Do not exceed 1.0 amp loading.
10
15
20
10
15
20
LOW HEAT TIME
ADJUSTMENT
SINGLE STAGE
THERMOSTAT
Y1
R
W1
G
C
X/
L
OC
G
W2
W1
R
Y
Y1
Y2
HUM
MINUTE SELECT
MINUTE SELECT
X/L
O
C
GW
2
W1
R
Y
Y1
Y2
HUM
HEAT PUMP
HUMDISTAT
COOL
HEAT
DELAY
ADJ
P9
P6
W1
W2
CFM/TIMER BOARD
TWO STAGE
THERMOSTAT
JUMPER MUST BE IN
TIMER OFF POSITION
CFM/TIMER
BOARD
OUTDOOR
UNIT
Y2
Y1
R
W1
W2
G
C
X/L
Y2
Y1
Y2 OUT
R
C
X/L
X/
L
O
C
G
W2
W
1
R
Y
Y1
Y2
HUM
FIGURE 12:
Accessory Connections
This furnace may not be common vented with any other appliance,
since it requires separate, properly sized air intake and vent lines.
The furnace shall not be connected to any type of B, BW or L vent
or vent connector, and not connected to any portion of a factory-
built or masonry chimney
The furnace shall not be connected to a chimney flue serving a sep-
arate appliance designed to burn solid fuel.
When combustion air pipe is installed above a suspended ceiling or
when it passes through a warm and humid space, the pipe must be
insulated with ½” Armaflex type insulation.
Vent piping must be insulated with 1/2” Armaflex insulation if it will
be subjected to freezing temperatures such as routing through
unheated areas or through an unused chimney.
BLK
115 VOLT
HUMIDIFIER
HUM. HOT
WHT
EAC HOT
115 VOLT
ELECTRONIC
AIR CLEANER
BLK
WHT
EAC
HUM
NEUTRALS
EAC
HUM
SWITCHED
CIRCUITS
