AERCO Esteem Users Guide - Manual (Page 14)

11
Standby Mode
Standby Mode
StbY
After the boiler is turned on, the control panel
will display STANDBY mode as shown in the
figure above.
This is the standard mode for the Esteem.
The control automatically returns to this
mode after 20 minutes if no keys have been
pressed on the display.
The first character shows (on left side of dis-
play) the current status of the boiler depend-
ing on the condition of both the boiler and
the burner. The last 3 characters indicate
the current boiler supply temperature.
If the burner is blocked due to a “soft” lock-
out, the display alternates between a 9 fol-
lowed by the boiler outlet temperature and
a “b” with a two digit error code
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 supply
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 (202 F) .Burner will
remain OFF until outlet temperature drops
below 200 F
Return temperature too high (202 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
Short circuit measured across optional DHW
temperature sensor terminals
Open circuit measured across optiona DHW
temperature sensor terminals.
Open circuit measured across the flue
temperature sensor.
Flue temperature greater than 240 F less than
250 F. Burner off for 150 seconds
Wait for the blower to start
8 b
29 b
33 b
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 each cycle for a max. 20 cycles.
30 b
35 b
Short circuit measured across flue temperature
sensor terminals. Burner OFF until corrected.
35 b
40 b
52 b
65 b
2
Chapter 5 BOILER CONTROL DISPLAY
GF-125U