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Adjustment
+ 10%
NORMAL (Factory)
- 10% (approx.)
MOTOR TEST
Table 18. Cooling Mode Blower Speed Adjustment
Switches 12 and 13 - Cooling Mode Blower Speed
Ramping - Blower speed ramping may be used to enhance
dehumidification performance. The switches are factory
set at option A which has the greatest effect on blower
motor performance. Table 19 provides the cooling mode
blower speed ramping options that will result from different
switch settings. The cooling mode blower speed ramping
options are detailed below.
NOTE: The OFF portion of the selected ramp profile
only applies during heat pump operation in dual fuel
applications.
Ramping Option
A (Factory)
B
C
D
Table 19. Cooling Mode Blower Speed Ramping
Ramping Option "A" (Factory Selection)
•
Motor runs at 50% for 30 seconds.
•
Motor then runs at 82% for approximately 7-1/2
minutes.
•
If demand has not been satisfied after 7-1/2 minutes,
motor runs at 100% until demand is satisfied.
•
Once demand is met, motor runs at 50% for 30
seconds then ramps down to stop.
Ramping Option "B"
•
Motor runs at 82% for approximately 7-1/2 minutes.
If demand has not been satisfied after 7-1/2 minutes,
motor runs at 100% until demand is satisfied.
•
Once demand is met, motor ramps down to stop.
Page 44 of 73
Switch 10
Switch 11
On
Off
Off
Off
Off
On
On
On
Switch 12
Switch 13
Off
Off
On
Off
Off
On
On
On
Ramping Option "C"
•
Motor runs at 100% until demand is satisfied.
•
Once demand is met, motor runs at 100% for 45
seconds then ramps down to stop.
Ramping Option "D"
•
Motor runs at 100% until demand is satisfied.
•
Once demand is met, motor ramps down to stop.
Switches 14 through 19 - Heating Mode Blower Speed
- These switches are factory set at the OFF position
which provides 100% of normal speed during HIGH HEAT
demand, 70% of normal speed during MIDRANGE HEAT
demand and 40% of normal speed during LOW HEAT
demand. Switches 14, 15 and 16 are used to adjust the
LOW HEAT blower motor speed. Switches 17, 18 and 19
are used to adjust the HIGH HEAT blower motor speed.
Table 20 and Table 21 provide the heating mode blower
speeds that will result from different switch settings. See
Table 22 for allowable heating speeds.
Thermostat
Demand
Adjustments
Low Heat
(R to W1)
Table 20. Low Heat Blower Speeds
Thermostat
Demand
Adjustments
High Heat
(R to W1 &
W2)
Table 21. High Heat Blower Speeds
Issue 2241
DIP Switch Settings
Blower
Speed
14
15
+15%
On
Off
+7.5%
On
Off
Normal
Off
Off
-7.5%
On
On
-15%
On
On
DIP Switch Settings
Blower
Speed
17
18
+15%
On
Off
+7.5%
On
Off
Normal
Off
Off
-7.5%
On
On
-15%
On
On
16
On
Off
Off
Off
On
19
On
Off
Off
Off
On
507029-05
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