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1 Service (continued)
21
Outdoor air shutdown differential
The outdoor air shutdown differential parameter is the number
of degrees below parameter F5 the outdoor air temperature
must go before the unit will respond to a SH demand. The
temperature range of this parameter is 0°F (0°C) to 90°F (50°C).
The default value is 10°F (5°C).
Shift reset curve
The shift reset curve parameter shifts the actual setpoint above
or below the calculated setpoint the number of degrees in this
parameter. The temperature range of this parameter is -27°F
(-15°C) to 27°F (15°). The default value is 0°F (0°C). This
feature will be active if this parameter is set to anything other
than 0°F (0°C).
Boost temperature
If a SH demand lasts longer than the programmed time delay
setting (F9) and there have been no DHW demands, the control
will increase the SH setpoint by the amount in this parameter.
If the SH demand continues through another time period, the
setpoint will be increased again. This will continue until either
the SH demand ends, a maximum of 20 increases has occurred,
or the SH user setpoint has been reached. Once the SH demand
has been satisfied the setpoint will revert back to its calculated
setting. The temperature range of this parameter is 0°F (0°C) to
45°F (25°C). The default value is 0°F (0°C). This feature will be
active if this parameter is set to anything other than 0°F (0°C).
Boost time
The boost time parameter sets the amount of time that must
elapse with a SH demand before the water temperature setpoint
will be increased. The time range for this parameter is 1 minute
to 250 minutes. The default value is 20 minutes.
Anti-cycling
Anti-cycle time
Once a demand has been satisfied, a set amount of time must
elapse before the control will respond to a new demand. The
control will block the new heat demand and anti-cycling will
be shown in the display until the time has elapsed or the water
temperature drops below the Anti-cycle Override Differential
parameter. The time range for this parameter is 0 minutes to 40
minutes. The default value is 1 minute.
Anti-cycle override differential
The control will bypass the anti-cycling time if the inlet water
temperature drops too quickly. The control will use the water
temperature at the time it shut off as the starting point. If
the temperature drops below the temperature parameter the
control will abort anti-cycling and allow the unit to fire. The
temperature range of this parameter is 0°F (0°C) to 54°F (30°C).
The default value is 10°F (5°C).
Minimum On/Off delay Stages 1, 3
Whenever Stage 1 or Stage 3 (if used) starts or stops, a timer is
started. This timer must expire before that stage can turn off or
back on. The range of this parameter is 0 to 255 seconds. The
default value is 60 seconds.
Next on delay
Whenever Stage 1 or Stage 3 (if used) turns on, a timer must
expire before another Stage 1 or 3 can turn on, whether in the
same heater, or in another heater in a Cascade. The range of
this parameter is 0 to 255 seconds. The default value is 60
seconds.
Copper-fin II/IIE Boiler and Water Heater Service Manual