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7
Gas Piping
(continued)
!
WARNING
Explosion Hazard.
•
Failure to use proper thread compounds on all
gas connectors may result in leaks of flammable
gas.
•
Gas supply to boiler and system must be
absolutely shut off prior to installing or servicing
boiler gas piping.
B. Connect Boiler Gas Valve To Gas
Supply System
1. Use methods and materials in accordance with
local plumbing codes and requirements of gas
supplier. In absence of such requirements,
follow National Fuel Gas Code, ANSI Z223.1/
NFPA 54 and/or Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
2. Use thread (joint) compounds (pipe dope)
resistant to action of liquefied petroleum gas.
3. Apex boilers have factory supplied
miscellaneous parts cartons, which include
gas-piping components to connect boiler gas
valve(s) to gas supply system. Install these
components prior to connecting boiler to gas
supply system piping as follows:
Boiler Model
APX425C
APX525C
APX625C
APX725C
APX825C
Models APX425C and APX525C
a. Locate and remove the ¾ in. NPT x 6 in.
long black nipple and ¾ in. NPT external
gas shutoff valve (required).
b. Insert nipple though grommet in left side
panel. Apply pipe dope and thread nipple
into gas valve (APX425C) or gas inlet tee
(APX525C).
c. Mount the ¾ in. NPT external gas shutoff
valve onto the nipple threaded end outside
of the jacket left side panel.
d. Install sediment trap, ground-joint union and
manual shut-off valve upstream of mounted
factory supplied manual shut-off valve. See
Figure 7-5 "Recommended Gas Piping".
106308-05 - 3/23
Miscellaneous Parts Carton
106315-01
106316-01
106317-01
APEX
Installation, Operating, & Service Instructions
Figure 7-5: Recommended Gas Piping
Models APX625C, APX725C and
APX825C
e. Locate and remove 1 in. NPT external gas
shutoff valve (required).
f. Insert nipple through grommet in left side
panel. Apply pipe dope and thread nipple
into gas inlet tee or cross.
g. Mount the 1 in. NPT external gas shutoff
valve onto the nipple threaded end outside
of the jacket left side panel.
h. Install sediment trap, ground-joint union and
manual shut-off valve upstream of mounted
factory supplied manual shut-off valve. See
Figure 7-5 " Recommended Gas Piping".
4. All above ground gas piping upstream from
manual shut-off valve must be electrically
continuous and bonded to a grounding
electrode. Do not use gas piping as grounding
electrode. Refer to National Electrical Code,
NFPA 70 and/or Canadian Electrical Code Part
1, CSA C22.1, Electrical Code.
Table 7-6: Min./Max. Inlet Gas Pressure Ratings
Natural/LP
Boiler
Gas Max,
Model
in. wc
(kPa)
APX425C
APX525C
14.0
APX625C
(3.49)
APX725C
APX825C
Natural Gas
LP Gas
Min,
Min,
in. wc (kPa)
in. wc (kPa)
4.0
8.0
(1.00)
(1.99)
55
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