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Part Number 550-142-300/0520
34
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Operation — spark-ignited pilot boilers9a
Follow all procedures given in this manual
and operating instructions when operating the
boiler. Failure to do so could result in severe
personal injury, death or substantial property
damage.
1. Standby: With no call for heat, the vent damper and circulator
are de-energized. No gas flows to pilot or main gas valve.
2.
Call for heat (thermostat circuit closes):
a. While attempting to satisfy the heat demand, the control
module monitors the boiler temperature changes via the
temperature sensor and determines whether or not the
available hot water will satisfy the demand, only running
the circulator. If additional heat is needed, the sequence
continues. When DHW (if used) calls for heat, sequence
above is bypassed.
b. Vent damper and circulator energized if pilot status ac-
ceptable. Vent damper drives open. When vent damper end
switch makes circuit, ignition control begins pilot ignition
attempt.
c. Ignition control checks for false flame signal: If ignition
control senses pilot signal when no pilot gas should be
present, control will lockout, requiring reset procedure as
given in
Figure 24.
3. Pilot ignition: Control module sparks the pilot and opens pilot
valve in main gas valve.
a. If pilot does light and control module senses flame
current, spark generator is turned off and main valve
opens.
b. Natural Gas - If pilot does not light within 15 seconds,
pilot valve is closed and spark generator is turned off. Control
module waits 5 minutes, then attempts to ignite pilot again.
This cycle will continue indefinitely if pilot ignition control
does not sense pilot flame.
c. Propane Gas - If pilot does not light within 15 seconds,
pilot valve is closed and spark generator is turned off. Control
module waits 1 minute then attempts to ignite pilot again.
After first failed ignition retry attempt, control module will
attempt to ignite pilot 2 more times with a 5 minute wait
period after the second try and a 60 minute wait period after
the third try. If the ignition control does not sense pilot flame
during these trials, it will lock out the boiler and require a
manual reset procedure to allow further attempts.
Manual Reset Procedure for Propane Gas Lockout ––
Unburned propane gas may have accumulated
in combustion chamber. Provide adequate
ventilation to completely remove any
accumulated LP gas from boiler and adjacent
area before attempting to reset and light boiler.
Failure to do so will cause severe personal
injury, death or substantial property damage.
Propane Gas Lockout manual reset – ONLY
after boiler area has been cleared of any
accumulated LP gas:
• Push and hold TEST button, see page 50, Item 11.
• While holding TEST button, rotate Economy Adjust knob
fully clockwise then fully counter clockwise.
• Release TEST button.
• Control module is reset.
This boiler is equipped with a control system that automatically adjusts a time delay period to turn on the boiler during a call
for heat. This is accomplished by circulating available hot water in the system while measuring water boiler water tempera-
ture changes. The control calculates a suitable delay based on temperature measurements and turns the boiler on only after it
determines that the demand for heat cannot be satisfied with the available hot water,
Due to the wide variety of controls used in boiler installations, this control is also equipped with an adjustment for the cal-
culated time delay period (ECONOMY ADJUST). In the MIN position, the time delay is zero and the IMPORTANT notice
below must be observed:
IMPORTANT
In accordance with Section 325 (f) (3) of the Energy Policy and Conservation Act, this boiler is equipped with a feature that
saves energy by reducing the boiler water temperature as the heating load decreases. This feature is equipped with an override
which is provided primarily to permit the use of an external energy management system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces the boiler water temperature as the heating load
decreases.
• This boiler is part of a modular or multiple boiler system having a total input of 300,000 BTU/hr or greater.
• This boiler is equipped with a tankless coil.
Department of Energy – Compliance
8
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