Crown Boiler FWZ Series, Installation Instructions Manual

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1) TEMP - ACTIVE - Indicates that the control is powered and that the temperature function is active.
2) TEMP - HI TEMP - Illuminates when the boiler water temperature reaches the high limit setting. It will remain lit until the
water temperature falls 10°. The control prevents burner operation while this LED is on. See Differential explanation on page
28.
3) LWCO - ACTIVE - Indicates that the low water cut-off (LWCO) function of the control is active.
4) LWCO - LOW WATER - Indicates that the boiler is in a low water condition. The control will prevent burner operation
during this condition. If the LOW WATER light is blinking, the control has been programmed to provide lock- out protection
in the event a low water condition is detected (see Manual Reset Low Water Cut-Off on page 30). Pressing the TEST/
SETTINGS button will reset the control.
D. LED Legend and TEST/SETTINGS Button
(Figure 12.3)
TABLE 12.2 DEFAULT SETTINGS
Dial
Setting
Feature Options Description
Default
Setting
1
Thermal Pre-Purge
Off
on
Purge Inactive
Purge Active
Off
2
Fahrenheit or Celsius
F
c
Degrees Fahrenheit
Degrees Celsius
F
3
LWCO Manual or Auto -
matic Reset
A
b
Automatic Reset
Manual Reset
A
4
Circulator Options
A
b
c
Circulator operation on TT call only
Circulator operation on ZC/ZR call only
Circulator operation on call from either
A
5
Circulator Hold Off
on
Off
Circulator Hold Off - Active
Circulator Hold Off - Inactive
on
6
Not available on this
control
7
Not available on this
control
8
Well Type
A
b
Hydrolevel Electro-Well (supplied with boiler)
Standard Immersion Well
A
9
High Limit
Differential
10
20
30
10° Differential
20° Differential
30° Differential
10
def
Restore Factory
Defaults
y
n
Restore Defaults
Do Not Restore Defaults
n
WARNING
If the Hydrostat is found to be in a low water condition:
• Have the system checked by a qualified HVAC service technician before attempting to
restore operation.
• Do not add water to the boiler until it has fully cooled.