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NOTE
The unit is equipped with
a frost protection feature.
This feature operates the
unit's built-in pump and the
burner to help protect the unit
from freezing. If the unit is
in a hard lock-out condition
the burner will not operate,
but the unit's built-in pump
will operate. We are not
responsible for damages
to the unit, and/or related
components, nor property
damages that may result from
freezing conditions.
USER'S INFORMATION MANUAL
HEATING BOILERS 99 - 120
SEQUENCE OF OPERATION
The Heating boiler operates in a similar way for both a space heating and a
domestic hot water call for heat . When the unit is powered up the controller
enters a self diagnostic mode and displays the controller software version in the
main display . .
The sequence of operation is as follows:
The unit receives a call for heat from a dry contact closure on terminals
1 .
X13 .1 and X13 .2 (24 volts section) . The unit can also receive a call for
domestic hot water heating from a 10KΩ sensor or aquastat wired to
terminals X13 .4 and X13 .5 (24 volts section) .
The unit performs a safety check and energizes the fan for a pre-purge
2 .
(Service Display = 3) .
Once the 5-second pre-purge is compete, the unit enters a 5-second trial for
3 .
ignition (Service Display = 4) . If the unit fails to ignite, the unit will complete
another 5-second pre-purge then 5-second trial for ignition . This is repeated
4 times before a hard lock-out occurs . The Return button must be pressed to
reset the controller and begin another trial for ignition .
Once the burner is lit
4 .
is programmed (Display
water) .
If the unit exceeds its target temperature and there is still a call for heat or
5 .
hot water the burner will turn off integral pump runs. (Service Display = 1)
After a call for heat is satisfied, the unit's pump will operate for an adjustable
6 .
amount of time (Service Display = 0) .
If the burner is on for frost protection (Service Display = 9) .
7 .
MAIN
LIT
DISPLAY
DISPLAY
(blank)
-
(blank)
(blank)
XXX
0
XXX
1
XXX
2
XXX
3
XXX
4
XXX
+
XXX
+
XXX
7
XXX
9
Table 2: Operating Display and Service Display Codes.
and flame has been proven the unit operates as it
=
for space heating or
DESCRIPTION
The unit is OFF . Press the space above the dot for 2
.
seconds to turn on the unit
No Call for Heat - Standby
Unit pump running – pump post purge
Unit water temperature exceeds target – unit pump is
energized, call still present
Self-test – When power is applied to the unit the
controller enters a self diagnostic mode for 5 seconds
Fan Pre-purge , and Post-purge
Trial for Ignition and Flame Proving
Heating – Space Heating
Heating – DHW
Burner on for Comfort mode
Freeze Protection mode
for
for domestic hot
9
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