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B4 Volume Water Heater
2.
Make sure the heater's power switch is in the
"ON" position. After placing the manual pilot
gas valve in the open position and resetting all
safety devices, (high limit, pressure switch, low-
water cutoff, etc.) pilot(s) can be lit following the
procedure located on the heater rating plate.
3.
Once the pilot(s) is lit and has been established
for five minutes, the flame failure response time
should be checked as follows:
System 9 - (Intermittent ignition): With this
system pilots are automatically lit when the operating
controls call for heat. If the pilot flame fails for any
reason, the main valve is shut off within one second
and the pilot spark ignition is initiated until the pilot
flame has been reestablished. On propane systems, unit
locks out for safety. This sequence should be checked
by turning off the manual pilot gas valve, and, at the
same time, monitoring the audible sparking at the pilot
burner and signal interruption to the main valve.
Propane gas is heavier than air and sinks to
the ground. Exercise extreme care in lighting
the heater when so equipped.
System 16 - (Electronically supervised standing
pilot system): Extinguish the pilot flame by placing
the manual pilot valve in the closed position, and at
the same time, begin recording the time it takes for the
output signal from the electronic ignition control to
be interrupted. The signal interruption can be detected
either with a test light or a voltmeter. The response
time should never exceed one second.
4.
With the pilots lit, initial activation of the main
burners can be achieved by slowly opening
the main manual valve. The result should be a
smooth lighting of the main burners.
Hi-Limit Checkout:
After running the heater for a long enough
period, bring the water temperature within the range of
the hi-limit and slowly back off the high limit setting
until the heater shuts off. The main burners should
reignite when the hi-limit is reset and turned back up
to its original setting. The heater should now run until
it shuts off automatically on operating aquastat.
3.3 To Start Up System:
3.3.1 Start Up Heater
Be certain system pump is running, then proceed
as follows:
1.
Turn off main electrical switch.
2.
Turn off all manual gas valves and wait five
minutes (see Figure 16).
3.
Set operating control to lowest setting.
4.
Slowly turn manual gas valve to "ON".
Caution
Pilot Valve
ON
ON
OFF
Main Gas Valve
Figure 16. Gas Manual Valves.
5.
Reset all safety valve switches (manual reset high
limit and low water cut off).
6.
Open manual pilot valve. Turn on main electrical
switch.
7.
Set temperature controller to desired temperature.
Pilot will light automatically to ignite main
burners whenever the aquastat calls for heat.
For standing pilot system, press on pilot relay
knob, see Figure 17, light pilot and keep relay knob
depressed for one minute then release. Once the pilot
is lit, the power is supplied through the aquastat to the
main gas valve.
3.3.2 To set the temperature and high-
limit controls:
When using a tank aquastat:
Set the tank aquastat to the desired tank
temperature. Set the heater temperature control 20°F
higher than tank aquastat. Set the manual reset high
limit 50°F higher than tank aquastat. Example: If
desired temperature is 140°F, set the tank aquastat at
140°F, set the heater temperature control at 160°F, and
set the manual reset high limit at 190°F. If the heater
is equipped with a pump time delay, the three-position
switch on the side of the heater can be put into the
"Auto Pump" position, so that the pump will only run
when the tank aquastat calls for heat. Then, when the
call for heat is satisfied, the heater will turn off, but
the pump will run for the set amount of delay time
(adjustable between 0.1 and 10 minutes).
Page 15
ON POSITION
ON
OFF
OFF
Main Gas Valve
Pilot Valve
OFF POSITION
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