PG80MSU: 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.
13
1. Gas supply connections MUST be performed by a licensed plumber
or gas fitter.
2. When flexible connectors are used, the maximum length shall not
exceed 36 inches (915 mm).
3. When lever handle type manual equipment shutoff valves are used,
they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT approved by the
state of Massachusetts.
Refer to
for recommended gas pipe sizing. Risers must be used
to connect to furnace and to meter. Support all gas piping with
appropriate straps, hangers, etc. Use a minimum of 1 hanger every 6 ft.
(2 M). Joint compound (pipe dope) should be applied sparingly and only
to male threads of joints. Pipe dope must be resistant to the action of
propane gas.
* Cubic ft. of natural 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: Chapter 6 current
edition of ANSI Z223/NFPA 54.
An accessible manual equipment shutoff valve MUST be installed
external to furnace casing and within 6 ft. (2 M) of furnace. 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.
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
A180231
Fig. 21 – Gas Control Valve
Install a sediment trap in 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. 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.
A02035
Fig. 22 – Typical Gas Pipe Arrangement
Piping should be pressure and leak tested in accordance with NFGC in
the United States, local, and national plumbing and gas codes before the
furnace has been connected. After all connections have been made,
purge lines and check for leakage at furnace prior to operating furnace.
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.
ELECTRICAL CONNECTIONS
for field wiring diagram showing typical field 115-V wiring.
Check all factory and field electrical connections for tightness.
Table 5 – Maximum Capacity of Pipe*
NOMINAL
IRON
PIPE
INTERNAL
DIAMETER
LENGTH OF PIPE - FT. (M)
SIZE IN.
(mm)
In. (mm)
10
20
30
40
50
1/2 (13)
0.622 (16)
175 (53)
120 (37)
97 (30)
82 (25)
73 (22)
3/4 (19)
0.824 (21) 360 (110)
250 (76)
200 (61) 170 (52) 151 (46)
1 (25)
1.049 (27) 680 (207) 465 (142) 375 (114) 320 (98) 285 (87)
1-1/4 (32) 1.380 (35) 1400 (427) 950 (290) 770 (235) 660 (201) 580 (177)
1-1/2 (38) 1.610 (41) 2100 (640) 1460 (445) 1180 (360) 990 (301) 900 (274)
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 disconnecting.
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 access panel door switch opens 115-V power to control. No
component operation can occur. Do not bypass or close switch with
panel removed.
