46
Start-Up Procedures
STANDBY, no demand for heat
Fan prepurge (10 seconds) or post purge cycle
Ignition sequence
Burner ON for space heating (CH)
Burner ON for domestic water heating (DHW)
Pre-check for air flow prior to prepurge cycle
Burner OFF due to reaching temperature
set point
Post pump cycle for domestic hot water
(30 seconds)
Post pump cycle for primary space heating
(1 minute)
Burner blocked:
Supply temperature too high (203 F) .Burner will
remain OFF until outlet temperature drops
below 200 F
Return temperature too high (203 F). Burner
will remain OFF until temperature drops
below 200 F
Return temperature is measured higher than
supply temperature. Burner will remain OFF
until corrected.
Supply temperature increased too quickly.
Burner will remain OFF for a 10 minute period.
Burner will recycle, increasing waiting period 1
minute for a max. 15 minutes
Factory supplied LWCO pressure device or
external limit (terminals 15 & 16) is OPEN.
Burner off for 150 seconds, auto reset.
0
1
180
180
180
180
180
180
180
180
180
180
2
3
4
5
6
7
8
9
18
b
19
b
24
b
25
b
26
b
2
Display
Boiler function
No blower signal
Blower signal present, Burner will remain OFF
until condition terminates
Temperature rise between the supply and return
is more than 72 F. Burner will remain OFF for
150 seconds. Burner will recycle increasing
wating period 1 minute for a max. 20 cycle.
Short circuit measured across flue temperature
sensor terminals. Burner OFF until corrected.
Open circuit measured across the flue
temperature sensors.
Flue temperature greater than 241 F less than
250 F. Burner off for 150 seconds
Wait for the blower to start
8
b
2
2
9
b
30
b
35
b
40
b
52
b
65
b
Standby Mode Display
