SECTION TWO – Heater Installation
Heater Gas Connections
NNNNOOOOTTTTEEEE:::: See Page 4-14 through 4-18 in “Routine
Maintenance and Professional Servicing” for detailed
information about:
• Combustion, CO2 levels, etc.
• Conversion from natural gas to LP gas and vice versa.
• Burner servicing.
GGGGaaaassss PPPPiiiippppiiiinnnngggg
(See Figure 2-12)
The heater requires a gas supply of not less than 4"wc
and not more than 14"wc. Gas supply pressures out-
side of this range may result in improper burner opera-
tion. Aminimum inlet pressure of 4"wc is required to
maintain the input rating.
The gas supply must be installed in accordance with
the National Fuel Gas Code, ANSI Z223.1, and all
applicable local codes.
Install a manual shutoff valve and a sediment trap and
union located outside the heater jacket. Do not use a
restrictive gas cock. Shutoff valve must be a full ported,
listed valve for gas service.
The following gas pipe sizes are recommended for gas
supply piping:
Pressure Testing
Before operating the heater, test all gas connections for
leaks with soapy water. DO NOT use an open flame to
test for leaks.
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Disconnect the heater
and its shutoff valve from the gas
supply when pressure testing the gas supply system at
test pressures
above
1/2 psig (3.5 kPa).
Close the manual shutoff valve
to isolate the heater from the
gas supply line when pressure testing the gas supply
system at test pressures
at or below
1/2 psig (3.5 kPa).
NNNNOOOOTTTTEEEE:::: DO NOT use a corrugated flexible gas line to
supply heater. It will not deliver enough gas (at nomi-
nal diameter) to supply heater.
2-13
Installation Procedures
Manual
Shut-off
Valve
Sediment
Trap
Union
At least 4"
1" Dia. and up
18-24" of 3/4"
Gas Line
Figure 2-12: Raise gas line above Air Orifice (at
least 4") centerline to reduce risk of water in the
gas line in case of a heat exchanger leak.
Table 2-K: Recommended Pipe Sizes - Natural Gas
Recommended Pipe Sizes for Natural Gas
@ 1,000 Btu/ft
3
, 0.6 Sp Gr, 0.5” wc Pressure Drop
Model
0-25’
26-50’
51-100’
101-200’ 201-300’
SR200
3/4”
1”
1”
1-1/4”
1-1/4”
SR333
1”
1-1/4”
1-1/4”
1-1/2”
1-1/2”
SR400
1”
1-1/4”
1-1/4”
1-1/2”
2”
Recommended Pipe Sizes for Propane
Model
0-25’
26-50’
51-100’
101-200’ 201-300’
200
3/4”
3/4”
1”
1”
1-1/4”
333
3/4”
1”
1”
1-1/4”
1-1/4”
400
1”
1”
1-1/4”
1-1/4”
1-1/2”
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Risk of fire or explosion.
For safe installation:
1.
Do not
install a Propane heater in a pit or other
low spot. Propane gas is heavier than air and may
collect in low spots, causing a fire or explosion.
2. In utility rooms or garages, raise heater 18” off the
floor. Heavier-than-air fumes from gasoline or
other flammable liquids can travel across the floor
and could be ignited by the heater if they reach
the combustion chamber.
3. NEVER use a Propane heater in a natural gas
installation or vice versa unless you have convert-
ed the gas orifice to the correct specification with
a Sta-Rite conversion kit.
4. Do not use any orifices other than Sta-Rite
replacement orifices.
5. Do not attempt to alter the heater’s rating by
changing the orifice.
6. If combustion is not correct at first start-up, use
Sta-Rite orifice kit (not conversion kit) to correct it.
See Pages 4-17 and 4-18 in “Routine
Maintenance and Professional Servicing” for more
information.
Table 2-L: Recommended Pipe Sizes - Propane
