USER’S INFORMATION MANUAL
12
SFC COMBI BOILERS
3.
Once the 5 second pre-purge is compete, the unit enters a 5 second trial for
ignition (
Service Display = 4
). If the unit fails to ignite, the unit 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 Return button
must be
pressed to reset the controller and allow for another attempt.
4.
Once the burner is lit and fl ame has been proven the unit operates as it is
programmed (
Service Display
= for Space Heating or
for Domestic
Hot Water).
5.
If the unit reaches its target temperature and there is still a call for heat or hot
water. Burner will turn off (integral pump runs unless call is on-demand DHW
). (
Service Display = 1
).
6.
After the call for heat is satisfi ed, the 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
(
Service Display = 7
).
8.
If the burner is on for frost protection (
Service Display = 9
).
MAIN
DISPLAY
LIT
DISPLAY
DESCRIPTION
(blank)
-
The unit is OFF. Touch the space above the white
button to turn on the unit
.
(blank)
(blank)
No Call for Heat - Standby
XXX
0
Unit pump running – pump post purge
XXX
1
Unit’s water temperature reached target – -pump is
energized, call for heat still present
XXX
2
Self-test – When power is applied to the unit 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
+
Heating – Space Heating
XXX
+
Heating – DHW
XXX
7
Burner on for Comfort mode
XXX
9
Freeze Protection mode
Table 2: Operating Display and Service Display Codes.
NOTE
The correct 10KΩ temperature
sensor (or aquastat) must
beused to operate the indirect
unit properly. If the incorrect
sensor is used the domestic
hot water may overheat
causing serious injury or
death.
