Checking & Adjustments - RBI FUTERA III Series HeatNet Installation & Operation Manual

FUTERA III INSTALLATION AND OPERATION INSTRUCTIONS
CHECKING & ADJUSTMENTS
Spark Gap
With the main and pilot gas manual valves in the closed
position energize the unit. Observe the trial for ignition to
confi rm that the spark is strong and continuous. If not check
and adjust the spark gap as shown in Figures 17 &18.
Figure 16 – Spark Gap
Pilot Adjustment
The pilot pressure has been factory set at 3" W.C. for natural
and LP gas and shouldn't need adjustment. To check the
pilot pressure close the manual main shut-off valve 2 and
the pilot gas shut-off valve, Figure 14. Remove the 1/8" pipe
plug from the pilot tee and connect a manometer having a
minimum range of 6 in, 152 mm WC to it. Open the pilot
gas shut-off valve. With the unit powered, generate a call
for heat. When the prepurge is complete the ignition/pilot
trial will begin. At this point put the Honeywell RM7800 test
switch in the test position. The control will hold in the ignition/
pilot sequence allowing you to check the pressure.
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 pressure and counterclockwise to
decrease it.
3. Replace the pressure regulator adjustment screw cap.
CAUTION: Never force the regulator adjustment screw
beyond the stop limits or damage to the regulator will
occur!
Required Gas Pressure
Provide gas supply pressure at inlet to boiler gas train as
follows:
Minimum (in W.C.)
Maximum (in W.C.)
Measure pressure when the boiler is fi ring at full rate. Low
gas pressure could indicate undersized gas line or
insuffi cient gas supply.
"Static and operating gas pressure required at the gas
valve inlet is between 2" W.C. and 14" W.C. for natural gas
and 2" W.C. and 14" W.C. propane. If the gas pressure is
above this limit, a lock-up style regulator suitable for dead
end service such as an Equimeter or Fisher must be
installed to prevent increase (creep) of gas pressure when
the units are not operating. This pressure regulator
(supplied by others) may be installed at the service
entrance to each unit or a "master" regulator sized to
handle multiple units may be utilized. Consult local gas
utility or regulator manufacturer for recommendations to
meet specifi c job site requirements."
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 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
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, consult factory.
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 boiler!
26
LP Nat
2 2
14 14
3 3
, 0.28 m of gas and divide