SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS
Page 24
Pilot Adjustment
The pilot burner fl ame should envelope 3/8" to 1/2" of
the fl ame sensing probe, Figure 13. To adjust the pilot
the following steps must be taken:
1. Remove the pilot gas pressure regulator cap.
2. Turn the pressure regulator adjustment screw clock-
wise to increase the fl ame and counterclockwise to
decrease it.
3. Replace the pressure regulator adjustment screw
cap.
Figure 13 - Pilot Flame Adjustment
Gas Pressure Adjustment
CAUTION: The maximum inlet gas pressure listed
on the rating plate must not be exceeded or damage
to the boiler/water heater may occur voiding the
warranty!
The minimum supply pressure listed on the rating plate
is for input adjustment.
NATURAL GAS: Optimum results are obtained when the
boiler/water heater is operated with the manifold
pressure(s) set per Table 10. The manifold pressure
should not vary outside this range. The gas valve
pressure regulator has been preset at the factory. If
adjustment is necessary the following steps must be
followed:
1. Attach a
20 in
,
508 mm
W.C. manometer to the tap
on the manifold.
2. Remove the regulator adjustment screw cap from
the gas regulator. On systems that do not use a
separate gas regulator, remove the adjustment
screw cap from the gas valve body on the valve
closest to the gas supply piping.
3. Rotate the regulator adjustment screw clockwise to
increase the manifold pressure, counterclockwise to
decrease it.
4. Replace the regulator adjustment screw cap and
manifold pressure tap plug.
CAUTION: Never force the regulator adjustment
screw beyond the stop limits or damage to the
regulator will occur!
PROPANE GAS: Optimum results are obtained when
the boiler/water heater is operated with the manifold
pressure(s) set per Table 10. If the manifold pressure is
off by more than 5% adjust it according to steps 1
through 4 above.
Input Rate, Natural Gas
Gas appliances are rated based on sea level operation
with no adjustment required at elevations up to
2000 ft
.,
610 m
. At elevations above
2000 ft
,
610 m
input ratings
should be reduced by 4% for each additional
1000 ft
,
305 m
.
Check the input rate as follows:
1. Turn off all other gas appliances that use the same
gas meter as the boiler/water heater.
2. Call your gas supplier and ask for the heating value
of the gas.
3. Start the boiler/water heater and let it run for 15
minutes.
4. Using the gas meter and a stopwatch, clock the time
that it takes to burn
10 ft
3
,
0.28m
3
of gas and divide
this time by 10.
5. Insert the heating value and the time, in seconds,
into the formula below.
6. Input = (heating value, Btu/hr)(3600)/(time, seconds)
7. If the computed rate deviates by more than 5% from
the rated input value of the unit adjust the manifold
pressure accordingly. DO NOT adjust the manifold
pressure by more than 5%. If a proper rate cannot
be maintained without adjusting the manifold
pressure beyond the 5% limit, the main burner
orifi ces must be replaced. If the input rate is too low,
go to the next larger size of main burner orifi ces. If
the input rate is too high, go to the next smaller size.
CAUTION: Never increase the input to the boiler/
water heater above that for which it is rated. Doing
so can cause premature failure of the unit!