F97CMN and G97CMN: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
25
When a flexible connector is used, black pipe shall be installed at the
furnace gas control valve and extend a minimum of 2-in. (51 mm)
outside the furnace.
For direct vent (2-pipe) applications, seal the gas pipe knockout to
prevent air leakage.
Remove the required knockout. Install the grommet in the knockout.
Then insert the gas pipe. The grommet is included in the loose parts bag.
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.
PRESSURE TESTING ABOVE
½
psig:
The furnace and it’s individual shut-off valve must be disconnected from
the gas supply piping system during any pressure testing of that system
at test pressures in excess of
½
psig (3.5 kPa).
PRESSURE TESTING BELOW
½
psig:
The furnace must be isolated from the gas supply piping by closing its
individual manual shut-off valve during any pressure testing of the gas
supply piping system at test pressures equal to or less than
½
psig (3.5
kPa).
An accessible manual equipment shutoff valve MUST be installed
external to furnace casing and within 6 ft. (2 M) of furnace.
Install a sediment trap externally in the riser leading to furnace as shown
in
.
Connect a capped nipple into lower end of tee. Capped nipple
should extend below level of furnace gas controls. Place a ground
joint
union between furnace gas control valve and exterior manual
equipment
gas shutoff valve.
A11035A
Fig. 30 – Typical Gas Pipe Arrangement
A 1/8-in. (3 mm) NPT
plugged tapping, accessible for test gauge
connection, MUST be
installed immediately upstream of gas supply
connection to
furnace and downstream of manual equipment shutoff
valve.
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
.
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.
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
.
ELECTRICAL CONNECTIONS
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.
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. If polarity
is incorrect, control LED status indicator light will flash code 10 and
furnace will
NOT
operate.
Use a separate, fused branch electrical circuit with a properly sized fuse
or circuit breaker for this furnace. See
for wire size and fuse
specifications. A readily accessible means of electrical disconnect must
be located within sight of the furnace.
WARNING
!
FIRE OR EXPLOSION HAZARD
A failure to follow this warning could result in personal injury, death,
and/or property damage.
If local codes allow the use of a flexible gas appliance connector,
always use a new listed connector. Do not use a connector which has
previously served another gas appliance. Black iron pipe shall be
installed at the furnace gas control valve and extend a minimum of 2-in.
(51 mm) outside the furnace.
MANUAL
SHUT OFF
VALVE
(REQUIRED)
NOTE: Union may be inside the
vestibule where permitted by
local codes.
UNION
GAS
SUPPLY
SEDIMENT
TRAP
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings could result in dangerous operation,
serious injury, death or property damage.
Improper servicing could result in dangerous operation, serious injury,
death or property damage.
-
Before servicing, disconnect all electrical power to furnace.
-
When servicing controls, label all wires prior to disconnection.
Reconnect wires correctly.
-
Verify proper operation after servicing.
-
Always reinstall access doors after completing service and
maintenance.
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.