Option Switch Settings - White Rodgers 21V51U-843 Installation Instructions Manual

OPTION SWITCH SETTINGS

FURNACE MANUFACTURER
DIP Switch Selection for OEM Applications
S2
1 2
OFF OFF Trane
Thermo Pride/
OFF ON
Goodman
ON OFF Lennox
ON ON York
IMPORTANT: Switch selection must match furnace manu-
facturer for proper motor operation.
Set DIP switches S2-1 and S2-2 to match the equipment using
the table above. NOTE: DIP switch S2-3 is not used.
THERMOSTAT TYPE AND HEAT-FAN-OFF-DELAY
DIP Switches
Switch Settings
S7-1 S7-2
Thermostat
Off Off
Type and W2
On Off
Delay S7-1,
Off On
S7-2
On On
S7-3 S7-4
Heat Fan Off Off Off
Delay
Off On
S7-3, S7-4
On Off
On On
*Factory Settings
Multi-stage Thermostat Set-up,
Factory Default
DIP switches S7-1 and S7-2 (see table above) are set to the
"Off" position from the factory for use with a multi-stage ther-
mostat. This allows the thermostat to control staging between
low and high fire.
Single Stage Thermostat Set-up,
Module Controls Staging
DIP switches, S7-1 and S7-2 (see table above) configure for a
single stage thermostat. Options include a 10 minute delay on
second stage, 20 minute delay on second stage or an Auto set-
ting allowing the module to calculate the time delay for second
stage based on average demand. The "Average Calculated
Duty Cycle" table shows how the module calculates staging
based on demand.
4
OEM
OFF ON
1
2
3
S2
Options
Time
Off*
OFF ON
10 Minutes
1
Auto
20 Minutes
2
Time
3
90 Secs*
4
120 Secs
S7
150 Secs
180 Secs
Average
Calculated
Duty Cycle or is less
% Equals than
0 38
38 50
50 62
62 75
75 88
88 100
Heat Fan Off Delay Timing
DIP switches S7-3 and S7-4 (see table above) configure the
number of seconds the blower will run after the call for heat
ends. Factory default is 90 seconds.
HEAT PUMP AND DE-HUMIDIFICATION
DIP Switches
Switch
Settings
S5-1
Heat Pump
Off
S5-1
On
S5-2
De-humidifier
Off
S5-2
On
*Factory Settings
Heat Pump Systems
DIP switch S5-1 (see table above) is set to "On" from the factory
for use with conventional (non-Heat Pump systems). For heat
pump systems move the S5-1 DIP switch to the "Off" position.
This will continuously output an O signal to the motor whenever
there is Y signal and run the circulator blower at a constant speed
when the pump is operating.
De-Humidification Connection
DIP switch S5-2 (see table above) is set to "On" from the factory
for systems that do not have a dehumidification terminal con-
nection from the thermostat. For systems using a thermostat
that provides a De-Humidification option move DIP switch S5-2
to "Off".
Low to High
Stage Delay Demand
12 minutes Light
10 minutes Light to Average
7 minutes Average
5 minutes Average to Heavy
3 minutes Heavy Light
1 minute Heavy
Options
OFF ON
Installed
1
Not Installed*
2
S5
Installed
Not Installed*