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SAFETY INSTRUCTIONS
Risk of fire or explosion from incorrect fuel
use or faulty fuel conversion. Do not try to run a heater set
up for natural gas on propane gas or vice versa. Only qual-
ified service technicians should attempt to convert heater
from one fuel to the other.
Do not attempt to alter the rated input or type of gas by
changing the orifice. If it is necessary to convert to a differ-
ent type of gas, consult your Sta-Rite dealer. Serious mal-
function of the burner can occur which may result in loss of
life. Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the application
needs must be made by a Sta-Rite dealer or other qualified
agency using factory specified and approved parts.
Risk of explosion if a unit converted to
propane gas is installed in a pit or other low spot. Propane is
heavier than air. Do not install the heater using propane in
pits or other locations where gas might collect. Consult your
local building code officials to determine installation require-
ments of heater relative to propane storage tanks and filling
equipment. In Canada, Installation must meet the require-
ments of the Standard for the Storage and Handling of Liquid
Petroleum Gases, CAN/CSA B149.2 (latest edition). In the U.S.,
installation must meet the requirements of the Standard for the
Storage and Handling of Liquified Petroleum Gases, ANSI/NFPA
58 (latest edition). Consult local codes and fire protection
authorities about specific installation restrictions.
Propane (LPG) fired heaters must not be installed in garages in
Massachusetts, by order of the Massachusetts State Fire Marshall.
For more information, call the Fire Marshall's office.
Installation Instructions
Before proceeding with conversion, verify that the kit
contains all of the parts listed in the Parts List (Page 5),
and that the letter code stamped on the orifice corre-
sponds to the letter code for your model shown on Table
2, Page 3.
Tools Required
You will need the following tools and instruments to make
this conversion :
1
Adjustable wrench, 2-1/2" Capacity
1
Adjustable wrench, 1-1/2" Capacity
1
Flat Blade Screwdriver
1
Phillips Screwdriver for enclosure halves
1
7/16" Nut Driver
1
7/16" Wrench
1
3/16" Hex key (Allen wrench)
2
2 Ft. lengths of 1/4" flexible plastic or rubber tubing
2
1/8" NPT barbed fittings
1
Pipe Sealant approved for use with
natural gas or Propane
1
Pressure gauge or manometer with range to
14" W.C. ( the "High Pressure Gauge")
1
Differential pressure gauge or slope gauge
(inclined manometer) capable of reading to a
resolution of 0.05" W.C. (the
"Low Pressure Gauge")
1
Flue-gas analyzer reading either CO
Do not attempt the conversion without all the listed tools
and instruments.
GAS CONNECTIONS
The heater requires a gas supply of not less than
4" (10.2cm) wc and not more than 14" (35.6cm) wc.
Gas supply pressures outside of this range may result in
improper burner operation. A minimum inlet pressure of
4" (10.2cm) wc is required to maintain input rating.
The gas supply must be installed in accordance with stan-
dard CAN/CGA B149.1 and B149.2, or ANSI/NFPA 58 (as
applicable), and all applicable local codes. Install a manu-
al shut-off valve and a sediment trap and union located
outside the heater jacket. Do not use a restrictive gas cock.
The following gas pipe sizes are recommended for propane
gas supply piping, with a minimum pipe size of 3/4".
Check for compliance with local codes.
NOTICE: DO NOT use a corrugated flexible gas line to
supply the heater. it will not deliver enough gas (at
nominal diameter) to supply heater.
Table 1
Model
200
333
400
Instructions For Checking the Gas
Pressure Through the Combination
Gas Control Valve
tion, adjustment, alteration, service, or maintenance of
the Combination Gas Control Valve can lead to fire or
explosion, causing loss of life, personal injury, or property
damage.
These instructions are for the use of qualified service tech-
nicians only!
Do not attempt this procedure unless you have been
trained and certified in the care and repair of gas-fired
appliances!
Do not attempt this procedure if you find the following
instructions confusing!
This appliance is equipped with an unconventional gas con-
trol valve that is factory set with a manifold pressure of –.2"
wc. Installation or service must be performed by a qualified
service technician or the gas supplier. If this control valve is
replaced, it must be replaced with an identical control.
The combination gas valve incorporates dual shut-off
valves and a negative-pressure regulator. For proper opera-
tion, the regulated pressure at the outlet manifold of the
valve must be 0.2" wc below the reference pressure at the
blower mixer inlet, and the gas valve 'VENT' tap must be
connected to the mixer inlet as shown in Figure 1 (right).
Do not attempt to adjust the gas input by adjusting the reg-
or O
.
ulator setting. The regulator is factory set to maintain prop-
2
2
er combustion and must not be altered.
2
Recommended Pipe Size
For Propane (LPG)
0-25'
26-50'
51-100' 101-200' 201-300'
(0-7.6M) (7.6-15M) (15-31M) (31-62M) (62-92M)
3/4"
3/4"
1"
3/4"
1"
1"
1"
1"
1-1/4"
Risk of fire and explosion. Improper installa-
1"
1-1/4"
1-1/4"
1-1/4"
1-1/4"
1-1/2"
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