P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 38
Piping
3.7.1 Gas Piping Overview
Before making the gas hook-up, make sure the boiler is being supplied
with the type of fuel shown on
the boiler nameplate. If installing a dual fuel model, refer to section
for each gas type.
The boiler shall be installed such that the gas
ignition system components are protected from
water (dripping, spraying, rain, etc.) during
appliance operation and service (circulator
replacement, control adjustment, etc.).
The boiler is factory fire-tested and adjusted for proper
combustion. The gas train components are certified to
handle a maximum inlet pressure of
14" W.C. (1/2 psig).
Typical gas pressure supply for natural gas is 7" W.C.
(11" W.C. for propane). If the available gas pressure
exceeds 14" W.C., a suitable additional intermediate
gas pressure regulator of the "lock up" type must be
provided to reduce the pressure to less than 14" W.C.
Refer to the appliance’s label for the minimum inlet gas
pressure.
Install a sediment trap (drip leg) and a union connection ahead of the primary manual shutoff valve on
the boiler. A gas piping schematic is shown above. Gas piping should be installed in accordance with
National Fuel Gas Code, ANSI Z223.1, latest edition, and any other local codes which may apply; in
Canada see CAN/CSA-B.149.1, latest edition. In the Commonwealth of Massachusetts, the gas cock
must be a “T-handle type.”
Appliance Size (BTU/Hr)
Natural Gas Requirement
(CFH)
Propane Gas Requirement
(CFH)
1,500,000
1500
600
2,000,000
2000
800
2,500,000
2500
1000
3,000,000
3000
1200
4,000,000
4000
1600
Simplified Gas Piping
Note:
When using a vented lock-up gas pressure regulator, the vent piping should be increased by
one pipe size for every 10 equivalent feet of length. Never connect vent piping that is small in size
than the gas regulator’s vent port connection.
