2-9
STARTUP AND COMMISSIONING
HC SERIES BOILERS
HC 13-50, HC 23-84, HC 29-106, HC 33-124, HC 20-125, HC 33-160
SEQUENCE OF OPERATION
The boiler will operate in a similar way for both a space heating and a domestic
hot water call for heat. When the boiler is powered up the controller enters a self
diagnostic mode and displays 2 in the Service Display.
The Sequence of Operation is as follows:
1.
The boiler receives a call for heat from closing terminals X4.6 and X4.7 (24
volts). The boiler can also receive a call from Domestic Hot Water heating
from the closing terminals, X4.9 and X4.10 (24 volts) (12KΩ sensor or
aquastat)
2.
The boiler does a safety check and energizes the fan for a pre-purge
(Service Display = 3)
3.
Once the 5 second pre-purge is compete, the boiler enters a 5 second trial
for ignition (Service Display = 4). If the boiler fails to ignite, the boiler will
compete a 5 second inter-purge then another 5 second trial for ignition. This
is repeated 4 times before a hard lock out occurs. The Reset button
must be pressed to reset the controller and allow for another attempt.
4.
Once the burner is lit and flame has been proven the boiler operates as it is
programmed (Service Display = 5 for Space Heating or 6 for Domestic Hot
Water)
5.
If the boiler reaches its target temperature and there is still a call for heat or
hot water. (Service Display = 1)
6.
After the call for heat is satisfied, the boiler pump will operate for an
adjustable amount of time (Service Display = 0)
7.
If the burner is on to maintain the heat exchanger temperature for DHW
Comfort mode or for Freeze Protection mode (Service Display = 7)
8.
If the burner is on for Frost Protection (Service Display = 9)
MAIN
DISPLAY
SERVICE
DISPLAY
DESCRIPTION
(blank)
-
The boiler is OFF. Press the On/Off button to turn
on the boiler
(blank)
(blank)
No Call for Heat - Standby
XXX
0
Boiler pump running – pump post purge
XXX
1
Boiler water temperature reached target – boiler pump is
energized, call for heat still present
XXX
2
Self-test – When power is applied to the boiler the
controller enters a self diagnostic mode for 5 seconds
XXX
3
Fan Pre-purge , Inter-purge and Post-purge
XXX
4
Trial for Ignition and Flame Proving
XXX
5
Heating – Space Heating
XXX
6
Heating – DHW
XXX
7
Burner on for Comfort mode or Freeze Protection mode
Table 8: Operating Display and Service Display Codes.
2.7
NOTE
The boiler is equipped with
a Frost Protection feature.
This feature will operate
the boiler pump and the
burner to help protect the
boiler from freezing. If the
boiler is in a hard lock-out
condition the burner will not
operate, however the boiler
pump will operate. IBC is
not responsible for damages
to the boiler, and/or related
components, nor property
damages that may result from
freezing conditions.
