28
440 01 4201 03
Specifications subject to change without notice.
Piping should be pressure and leak tested in accordance with
the current addition of the NFGC in the United States, local,
and national plumbing and gas codes before the furnace has
been connected. Refer to current edition of NSCNGPIC in
Canada. After all connections have been made, purge lines
and check for leakage at furnace prior to operating furnace.
NOTE:
The furnace gas control valve inlet pressure tap
connection is suitable to use as test gauge connection
providing test pressure DOES NOT exceed maximum 0.5 psig
(14
−
in. w.c.) stated on gas control valve. (See
Figure 33
Redundant Automatic Control
Valve (Modulating)
ON/OFF Switch
1/2” NPT Outlet
Manifold
Pressure Tap
Inlet
Pressure Tap
Min/Max Heat Adust
(Under Cap)
GAS FL
OW
MODULATING
Turn screw 1 click per
second to adjust rate.
Clockwise to increase
rate, counter clockwise
to decrease rate.
A10496
If pressure exceeds 0.5 psig (14
−
in. w.c.), gas supply pipe must
be
disconnected from furnace and capped before and during
supply
pipe pressure test. If test pressure is equal to or less
than 0.5 psig
(14
−
in. w.c.), turn off electric shutoff switch
located on furnace gas control valve and accessible manual
equipment shutoff valve before and during supply pipe
pressure test. After all connections have been made, purge
lines and check for leakage at furnace prior to operating
furnace.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the furnace burners ON and OFF.
Some installations require gas entry on right side of furnace (as
viewed in upflow). (See
)
Gas Pipe Grommet
For direct vent (2-pipe) applications, the knockout for the gas
pipe must be sealed to prevent air leakage. Remove the
knockout, install the grommet in the knockout, then insert the
gas pipe. The grommet is included in the loose parts bag. (See
Figure 34
Gas Entry
Gas Pipe Grommet Required
For Direct Vent Applications
Left Side Gas Entry. Gas Pipe
Grommet Required For Direct
Vent Applications.
A11338
ELECTRICAL CONNECTIONS
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Blower door switch opens 115
−
v power to control. No
component operation can occur. Do not bypass or close switch
with blower door removed.
See
for field wiring diagram showing typical field
115
−
v wiring. Check all factory and field electrical connections
for tightness.
Field
−
supplied wiring shall conform with the limitations of 63
°
F
(33
°
C) rise.
!
WARNING
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70
−
2011 or local codes to
minimize personal injury if an electrical fault should occur. In
Canada, refer to Canadian Electrical Code CSA C22.1. This
may consist of electrical wire, conduit approved for electrical
ground or a listed, grounded power cord (where permitted by
local code) when installed in accordance with existing electrical
codes. Refer to the power cord manufacturer’s ratings for
proper wire gauge.
Do not use gas piping as an electrical ground.
!
CAUTION
FURNACE MAY NOT OPERATE HAZARD
Failure to follow this caution may result in intermittent furnace
operation.
Furnace control must be grounded for proper operation or
else control will lock out. Control must remain grounded
through green/yellow wire routed to gas valve and manifold
bracket screw.
115
−
V Wiring
Furnace must have a 115-v power supply properly connected
and grounded.
NOTE
: Proper polarity must be maintained for 115-v wiring.
Control status indicator light flashes code 10 and furnace does
