Part number 550-142-903/1016
65
d. IBC will begin purge cycle, then activate igniter.
Igniter will glow for approximately 35 seconds.
Near end of 35 seconds, 24 VDC will show at gas
valve for approximately 4 seconds and then return
to 0 VDC. Control will attempt ignition two more
times, increasing igniter time to 40 seconds for
these attempts. The control will then lockout,
flashing the POWER and FLAME lights.
e. To restart system, follow Operating instructions
on boiler (also Figure 76, page 67). (Control will
reset after power has been off for at least 45
seconds or automatically in 1 hour.
❏
Set Boiler Temp adjustment knob to system temperature re-
quirements. Adjust balancing valves and controls to provide
design temperature to system.
❏
Set Economy mode, to midpoint or as desired, see Depart-
ment of Energy notice below.
❏
For multiple zones, adjust flow so it is about the same in
each zone or as required.
❏
Cycle boiler with thermostat — Raise to highest setting and
verify boiler goes through normal start-up cycle. Lower to
lowest setting and verify boiler goes off.
❏
Cycle DHW Aquastat if used.
❏
Observe several operating cycles for proper operation.
❏
Set room thermostat to desired room temperature.
❏
Fill in Installation and service certificate (see back cover of
manual).
❏
Review all instructions shipped with this boiler with owner
or maintenance person. Return instructions to envelope and
give to owner or place in pocket inside front panel in boiler.
Department of Energy – Compliance
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 temperature 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 calculated 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 sys-
tem that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE FOLLOWING CONDITIONS IS TRUE:
s An external energy management system is installed that reduces the boiler water temperature as the heating load
decreases.
s This boiler is part of a modular or multiple boiler system having a total input of 300,000 BTU/hr or greater.
s This boiler is equipped with a tankless coil.
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
Start-up (continued)
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