Gas Supply Piping; General - UTICA BOILERS MAHF-100 Manual

!
DANGER
Fire Hazard. Do not use matches, candles, open
flames, or other methods providing ignition
source. Failure to comply will result in death or
serious injury.
!
WARNING
Fire, explosion, asphyxiation and burn hazard.
Boiler piping and gas connections shall be leak
tested before placing boiler in operation. Failure
to follow these instructions and or improper
installation could result in death or serious injury.
! !
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow gas supplier's
instructions.
• If you cannot reach your gas supplier, call the
fire department.
NOTICE
If overheating occurs or gas supply fails to shut
off, do not turn off or disconnect electrical supply
to pump. Shut off gas supply at location external
to the boiler.
NOTICE
Use of CSA approved corrugated, semi-rigid
stainless steel tubing with polyethylene jacketing
is approved for use with boilers following tubing
manufacturer's instructions.
Use of flexible "appliance whip" gas tubing is not
allowed per NFPA 54.
Required Gas Supply Pressure
at Maximum Firing Rate
Natural Gas
Min. Max.
3.5" w.c. 10.5" w.c.
(0.87 kPa) (2.61 kPa)

7 - GAS SUPPLY PIPING

Liquid Propane
Min. Max.
8.0" w.c. 13.0" w.c.
(1.99 kPa) (3.23 kPa)

7.1 General

• Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/
NFPA 54.
• Install external field sourced manual main gas
shutoff valve, ground joint union, and sediment trap
upstream of gas controls in accordance with state
and local requirements. See Figure 7-1.
• Size and install gas piping system to provide
sufficient gas supply to meet maximum input at not
less than minimum supply pressure.
• Boiler shall be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of gas supply piping
system at test pressures equal to or less than 1/2 psi
(3.40 kPa - 34.47 mbar).
GAS SUPPLY REQUIRED:
MODEL NATURAL GAS (A)
MAHF-100
92 ft3/h
MACF-115
114 ft3/h
MAHF-125 118 ft /h (3.30 m
3
MACF-150
143 ft /h (4.00 m
3
MAHF-165 153 ft /h (4.30 m
3
MAHF-205
191 ft /h (5.40 m
3
• Install boiler so that gas ignition system components
are protected from water (dripping, spraying,rain,
etc.) during appliance operation and service
(circulator replacement, condensate trap, control
replacement, etc.).
• Gas meter and supply pipes must be capable of
delivering the listed quantity of gas in addition to
demand from any other appliances in the house.
Boiler requires a minimum 3/4" (19.5 mm) gas
supply pipe.
• Support piping with hooks, straps, bands, brackets,
hangers, or building structure components to prevent
or dampen excessive vibrations and prevent strain on
gas connection. Boiler will not support piping weight.
• Use thread (joint) compound (pipe dope) suitable for
liquefied petroleum gas.
• Leak test boiler and gas line connections before
placing boiler into operation.
36
LIQUID PROPANE (E)
2.60 38 ft3/h
( m3/h)
3.22 47 ft3/h (1.32 m3/h)
( m3/h)
/h) 51 ft /h (1.48 m
3 3
/h) 61 ft /h (1.72 m
3 3
/h) 66 ft /h (1.85 m
3 3
/h) 82 ft /h (2.30 m
3 3
240013371 REV B, [10/01/2021]
2.61
( m3/h)
/h)
3
/h)
3
/h)
3
/h)
3