035-20499-001 Rev. B (1004)
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.
Using a Single-Stage Heat Thermostat with the Furnace
- This two-
stage furnace may be used with a single-stage thermostat. Connect the
thermostat as shown in Figure 7. Place the “W2 Delay” jumper in the 10
minute, 15 minute or 20 minute position. If the jumper is left on the
“OFF” pins, the furnace will operate only in low fire.
ACCESSORY CONNECTIONS
The furnace control will allow power-switching control of various acces-
sories. Refer to Figure 10, for connection details.
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4” (6.4 mm) spade terminals (EAC and NEUTRAL) 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 NEUTRAL) for humidifier
connections are located on the control board. The terminals provide 115
VAC (1.0 amp maximum) during heating system operation.
TWINNING
These furnaces are not to be twinned. If more than one furnace is
needed in an application, each furnace must have its own complete
duct system and its own wall thermostat.
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 where all required clearance to combusti-
bles and other restrictions are met. The combustion air and the venting
system must be installed in accordance with Section 5.3, Air for Com-
bustion 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.
COMBUSTION AIR/VENT PIPE SIZING
Select the correct size from Table 9. The size will be determined by a
combination of furnace model, total length of run, and the number of
elbows required. The following rules must also be observed.
1.
Long radius (sweep) elbows are required for all units.
2.
Elbows are assumed to be 90 degrees. Two 45-degree elbows
count as one 90-degree elbow.
3.
Elbow count refers to combustion air piping and vent piping sepa-
rately. For example, if the table allows for 5 elbows, this will allow a
maximum of 5 elbows in the combustion air piping and a maximum
of 5 elbows in the vent piping.
FIGURE 6:
Line Wiring Connections
FIGURE 7:
Single Stage Heat Thermostat Connections
FIGURE 8:
Single Stage Heating and Two-Stage Cooling Thermostat
Connections
FIGURE 9:
Two Stage Heating and Two-Stage Cooling Thermostat
Connections
FIGURE 10:
Accessory Connections
BLK
WHT
GRN
BLK (HOT)
WHT (NEUTRAL)
GRN
NOMINAL
120 VOLT
ROOM
THERMOSTAT
FURNACE
CONTROL
CONDENSING
UNIT
TO AIR CONDITIONER
CONTROLS
R
W
G
Y
C
R
G
C
COMMON T’STAT CONNECTION
W1/W
Y/Y2
ROOM
THERMOSTAT
FURNACE
CONTROL
CONDENSING
UNIT
TO AIR CONDITIONER
CONTROLS
R
W
G
Y1
C
R
G
C
COMMON T’STAT CONNECTION
Y2
Y1
W1/W
Y/Y2
ROOM
THERMOSTAT
FURNACE
CONTROL
CONDENSING
UNIT
TO AIR CONDITIONER
CONTROLS
R
W1
W2
G
Y2
R
G
COMMON T’STAT CONNECTION
Y1
Y1
W1/W
C
C
W2
Y/Y2
115 VOLT
HUMIDIFER
115 VOLT
ELECTRONIC
AIR CLEANER
EAC HOT
HUM. HOT
BLK
WHT
EAC
HUM
NEUTRALS
SWITCHED
CIRCUITS
BLK
WHT
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 1/2” Armaflex or other heat resistant type insulation if
two feet or more of pipe is exposed.
Vent piping must be insulated if it will be subjected to freezing tem-
peratures such as routing through unheated areas or through an
unused chimney.
