935SA: Installation, Start-up, Operating and Service Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24
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.
Gas entry can be from left or right side, or top panel (see Fig. 35 and
Fig. 36).
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 Fig. 35).
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. w.c.) or less and a pressure drop of
0.5-in. w.c. (based on a 0.60 specific gravity gas). Ref: (Table 12) and 6.2 of NFPA54/ANSI
Z223.1 (current edition).
A190265
Fig. 35 – Gas Entry
A170125
Fig. 36 – Alternate Gas and Electric Entry
NOTE: Top plate may be field drilled for alternate gas and 115 VAC
electric entry
A11035
Fig. 37 – Typical Gas Pipe Arrangement
ELECTRICAL CONNECTIONS
Field wiring diagram showing typical field 115-V wiring (see Fig. 40).
Check all factory and field electrical connections for tightness.
Field-supplied wiring shall conform with the limitations of 63_F (35_C)
rise.
Table 12 – Maximum Capacity of Pipe
NOMINAL
IRON PIPE
SIZE
IN. (MM)
LENGTH OF PIPE - FT (M)
10 (3.0) 20 (6.0) 30 (9.1) 40 (12.1) 50 (15.2)
1/2 (13) 175 120 97 82 73
3/4 (19) 360 250 200 170 151
1 (25) 680 465 375 320 285
1-1/4 (32) 1400 950 770 660 580
1-1/2 (39) 2100 1460 1180 990 900
LEFT SIDE GAS ENTRY.
GAS PIPE GROMMET
REQUIRED FOR DIRECT
VENT APPLICATONS
GAS PIPE GROMMET REQUIRED
FOR DIRECT VENT APPLICATIONS
1 1/2 inch for Gas
7/8 inch for 115 VAC Electric
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.
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 NFPA 70 or local codes to minimize personal injury
if an electrical fault should occur. 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.
GAS
SUPPLY
MANUAL
SHUT OFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
NOTE: Union may be inside the
vestibule where permitted by
local codes.
FRONT
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