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ON/OFF SWITCH
1/2˝ NPT INLET
INLET
PRESSURE TAP
1/2˝ NPT OUTLET
Fig. 13 - - Two- -Stage Gas Valve (208/230 VAC Models)
ON/OFF SWITCH
INLET
PRESSURE TAP
Fig. 14 - - Single- -Stage Gas Valve (460 VAC Models)
If larger adjustments are required, change main burner orifices
following the recommendations of national and local codes.
NOTE:
All other appliances that use the same meter must be
turned off when gas flow is measured at the meter.
Proceed as follows:
1. Turn off gas supply to unit.
2. Remove pipe plug on manifold (See Fig. 11) and connect
manometer. Turn on gas supply to unit.
3. Record number of seconds for gas meter test dial to make
one revolution.
4. Divide number of seconds in Step 3 into 3600 (number of
seconds in one hr).
5. Multiply result of Step 4 by the number of cubic feet (cu ft)
shown for one revolution of test dial to obtain cubic feet (cu
ft) of gas flow per hour.
6. Multiply result of Step 5 by Btu heating value of gas to
obtain total measured input in Btuh. Compare this value
with heating input shown in Table 6 or 7 (Consult the local
gas supplier if the heating value of gas is not known).
EXAMPLE: Assume that the size of test dial is 1 cu ft, one
revolution takes 32 sec and the heating value of the gas is 1050
3
Btu/ft
. Proceed as follows:
1. 32 sec to complete one revolution.
REGULATOR COVER SCREW
PLASTIC ADJUST SCREW
REGULATOR SPRING
HIGH STAGE GAS
PRESSURE REGULATOR
ADJUSTMENT
LOW STAGE
GAS PRESSURE
REGULATOR ADJUSTMENT
MANIFOLD
PRESSURE TAP
A04167
REGULATOR
COVER SCREW
PLASTIC
ADJUSTMENT
SCREW
REGULATOR SPRING
(PROPANE - WHITE)
(
NATURAL - SILVER)
GAS PRESSURE
REGULATOR
ADJUSTMENT
MANIFOLD
PRESSURE TAP
A07751
2. 3600 32 = 112.5.
3
3. 112.5 x 1 =112.5 ft
of gas flow/hr.
4. 112.5 x 1050 = 118,125 Btuh input.
If the desired gas input is 115,000 Btuh, only a minor change in the
manifold pressure is required.
Observe manifold pressure(s) and proceed as follows to adjust gas
input(s):
1. Remove regulator cover screw(s) over plastic adjustment
screw(s) on gas valve (Fig. 13 For 208/230 VAC models,
Fig. 14 For 460 VAC models).
2. For 208/230 VAC models only: Turn the high stage plastic
adjustment screw clockwise to increase gas input and coun-
terclockwise to decrease input (see Fig. 13). For 460 VAC
models only: Turn the plastic adjustment screw clockwise to
increase gas input and counterclockwise to decrease input
(see Fig. 14). Manifold pressure must be between 3.2 and
3.8 IN. W.C. For high stage on 208/230 VAC models and
for single stage on 460 VAC models.
3. For 208/230 VAC models only: Replace high stage regulat-
or cover screw on gas valve (see Fig. 13). For 460 VAC
models only: Replace regulator cover screw on gas valve
(See Fig. 14).
4. For 208/230 VAC models only: turn the low stage plastic
adjustment screw clockwise to increase gas input and coun-
terclockwise to decrease input (see Fig. 13). Low stage
manifold pressure must be between 1.4 and 2.0 IN. W.C.
NOTE:
For 208/230 VAC models only, low stage manifold
pressure must be adjusted after high stage manifold pressure is
already adjusted.
5. For 208/230 VAC models only: Replace low stage regulator
cover screw(s) on gas valve (see Fig. 13).
6. Turn off gas supply to unit. Remove manometer from pres-
sure tap and replace pipe plug on manifold (see Fig. 11).
Turn on gas and check for leaks
WARNING
!
FIRE AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury or death and/or property damage.
Unsafe operation of the unit may result if manifold pressure
is outside this range.
Measure Manifold Pressure (Propane Units)
Refer to propane kit installation instructions for properly checking
gas input.
NOTE: For installations below 2,000 ft (610 m), refer to the unit
rating plate for proper propane conversion kit. For installations
above 2,000 ft (610 m), contact your distributor for proper propane
conversion kit.
Check Burner Flame
With control access panel (see Fig. 22) removed, observe the unit
heating operation. Watch the burner flames to see if they are light
blue and soft in appearance, and that the flames are approximately
the same for each burner. Propane will have blue flame (See Fig.
12). Refer to the Maintenance section for information on burner
removal.
18
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