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10
Operation
(continued)
Select
to access the following parameters.
Fan Speed-Up Ramp
Maximum fan ramp rate when fan speed is increasing.
Fan Speed-Down Ramp
Maximum fan ramp rate when fan speed is decreasing.
Fan Gain Up
Fan gain when fan speed is increasing.
Fan Gain Down
Fan gain when fan speed is decreasing.
CH Slow Start Enable/Disable
Enables or disables the slow start limit function for Central Heat and Sequence
Master demand sources. Uses the CH Low Fire Hold Rate parameter as the starting
point for the slow start.
DHW Slow Start Enable/Disable
Enables or disables the slow start limit function for DHW demand source. Uses the
DHW Low Fire Hold Rate parameter as the starting point for the slow start.
Slow Start Degrees
If Slow Start is enabled and supply temperature is less than setpoint minus Slow
Start Degrees, then slow start rate limiting is effective. Slow start rate limiting has no
effect when supply temperature is greater than setpoint minus Slow Start Degrees.
Slow Start Ramp
When slow start rate limiting is in effect, the modulation rate will increase no more
than the amount per minute given by this parameter. Although provided as a per-
minute value, the Control will calculate and apply this as a stepped function using
step duration of 10 seconds.
Select
to access the following parameters.
Sequencer On/Off
Turns control internal sequencer on or off.
102
Parameter and Description
Parameter and Description
APEX
Installation, Operating, & Service Instructions
Factory Setting
15
Disabled
Disabled
20°F
(11°C)
200 % / min.
Factory Setting
On
Range / Choices
0
0 to 12,000 rpm
0
0 to 12,000 rpm
1 to 100
5
1 to 100
Enable
Disable
Enable
Disable
0 to 180°F
(0 to 82.2°C)
0 to 1,000 rpm
Range / Choices
On
Off
106308-05 - 3/23
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