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Distance from Gas Meter or Last Stage Regulator
Model and
Gas Type
0-100'
0-31 m
100-200'
31-61m
200-300'
61-91m
200 natural
1¼"
3.2 cm
1¼"
3.2 cm
1¼"
3.2 cm
200 propane
1"
2.5 cm
1"
2.5 cm
1¼"
3.2 cm
300 natural
1¼"
3.2 cm
1½"
4.0 cm
1½"
4.0 cm
300 propane
1
2.5 cm
1¼"
3.2 cm
1¼"
3.2 cm
400 natural
1¼"
3.2 cm
1½"
4.0 cm
2"
5.0 cm
400 propane
1¼"
3.2 cm
1¼"
3.2 cm
1½"
4.0 cm
Notes:
1. These figures are based on 1/2" (0.12 kPa) water column pressure drop.
2. Check supply pressure and local code requirements before proceeding with work.
3. Pipe fittings must be considered when determining gas pipe sizing
.
Table 7. Gas Piping Size.
SECTION 3 Gas Supply and Piping
3.A Gas Supply and Piping
Gas piping should be supported by suitable
hangers or floor stands, not by the appliance.
This appliances’s gas train allows the user to
pipe the gas from either the right side or the left side
of the unit. As shipped, the right side of the gas train is
capped off, and there is a manual valve on the left side.
If desired, the manual valve on the left side of the gas
train may be moved to the right side, and the cap on
the right side may be moved to the left.
Review the following instructions before
proceeding with the installation.
1. Verify that the appliance is fitted for the proper
type of gas by checking the rating plate. All
models are equipped to operate at elevations up
to 10,000 feet (3050m). These appliances may
be adjusted to operate properly at altitudes above
2500 feet (see Section 6.5.2) and the input will be
reduced if the heating value of the gas supply is
below sea level values.
2. Verify the inlet gas supply pressure.
Min
Max
Natural Gas
3.5” W.C.
10.5” W.C.
Propane
8” W.C.
13” W.C.
3. Refer to
Table 7
, to size supply.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of
the gas controls.
7. All threaded joints should be coated with
piping compound resistant to action of liquefied
petroleum gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 0.5 psig (3.45 kpa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 0.5 psig (3.45 kpa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines.
WARNING
Do not use open flame to check for leaks.
An open flame could lead to explosion, which
could result in property damage, serious injury
or death.
AVERTISSEMENT
Ne recherchez pas les fuites avec une flamme
nue. Une flamme nue peut provoquer une
explosion qui peut causer des dommages
matériels, de sérieuses blessures corporelles
ou la mort.
NOTE
: This appliance and all other gas appliances
sharing the gas supply line must be firing at
maximum capacity to properly measure the inlet
supply pressure. The pressure can be measured at
the supply pressure port on the gas valve. Low gas
pressure could be an indication of an undersized
gas meter, undersized gas supply lines and/or an
obstructed gas supply line.
Mighty Therm
2
(200, 300, 400) Install & Operating
