Raypak 240692 Installation And Operating Instructions Manual page 21

BOILER TURN-ON DELAY
In a multiple boiler system:
The Boiler Turn-On Delay sets the time delay before each additional boiler is turned on in
response to a call for heat. This delay starts when the preceding boiler is turned on.
The Boiler Turn-On Delay range is from 0 to 5 min.
Recommended Initial Setting for Boiler Turn-On Delay is 30 sec.
STAGE TURN-ON DELAY
The Stage Turn-On Delay sets the time delay before a new stage in a multistage boiler
configuration is turned on. This delay starts when the stage or boiler preceding the next
stage is turned on.
The Stage Turn-On Delay range is from 0 to 60 sec.
Recommended Initial Setting Stage for Turn-On Delay is 10 sec.
CONTROL BAND
The Control Band sets the maximum temperature above or below the Target Temperature
(which is determined by the embedded micro-controller) between which the system tem-
perature may deviate. This provides a control deadband that limits the boiler from short-
cycling.
The Control Band range is from 1°F to 10°F.
Recommended Initial Setting for Control Band is 3°F.
OUTDOOR CUTOFF DEADBAND
The Outdoor Cutoff Deadband sets the number of degrees below the Outdoor Cutoff where
the Outdoor Cutoff reset occurs.
The Outdoor Cutoff Deadband range is from 1°F to 10°F.
Recommended Initial Setting for Outdoor Cutoff Deadband is 3°F.
OUTDOOR CUTOFF TEMPERATURE
The Outdoor Cutoff sets the maximum outdoor temperature at which heat is desired. This
control sets the outdoor temperature above which the boiler bank is disabled. If the out-
door temperature increases beyond the Outdoor Cutoff setting, the Control ON LED turns
off and if there is no call for heat, the pump turn-off delay starts turning off the pump. If
the outdoor temperature falls below the Outdoor Cutoff minus the Outdoor Cutoff Deadband
the boiler bank will again be enabled.
The Outdoor Cutoff Temperature is from 32°F to 200°F.
Recommended Initial Setting for Outdoor Cutoff Temperature is 65°F.
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