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3.
When there is a cooling demand, the indoor blower will
run on the cooling speed designated by the positions
of DIP switches 8 through 11.
Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
•
The furnace requires 120 volts ± 10% (Range: 108
volts to 132 volts).
•
The furnace operates at 60 Hz ± 5% (Range: 57 Hz
to 63 Hz).
•
The furnace integrated control requires both polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.
•
Generator should have a wave form distortion of less
than 5% THD (Total Harmonic Distortion).
These units are equipped with an integrated control. This
control manages ignition timing, combustion air inducer
speed, heating mode fan OFF delays and indoor blower
speeds based on selections made using the control DIP
switches and onboard links. The control includes an internal
feature that automatically resets the ignition control when it
has been locked out.
NOTE: All DIP switches are factory shipped in the "OFF"
position.
Heating Operation DIP Switch Settings
See Figure 56
Switch 1 - Thermostat Selection - This unit may be used
with either a single stage or two stage thermostat. The
thermostat selection is made using a DIP switch, which
must be properly positioned for the particular application.
The DIP switch is factory positioned for use with a two
stage thermostat. If a single stage thermostat is to be
used, the DIP switch must be repositioned. See Table 12.
Switch 2 - Operating Mode with Two Stage Thermostat
- If a two stage thermostat is used, the furnace can operate
in either variable capacity or conventional two stage mode.
When variable capacity mode is selected, the firing rate of
Operation
Variable Capacity Heat
(35% to 100%)
Three Stage Heat
(35%, 70%, 100%)
Two Stage Heat
(W1 70%, W2 100%)
Page 32 of 74
Thermostat
Two-Stage
Single-Stage
Two-Stage
Table 12. Thermostat Selection Switch Settings
the unit is varied to maximize comfort. Conventional two
stage mode is the factory default setting. See Table 12.
Switch 3 - Second Stage Heat On Delay - If a single
stage thermostat is used, the integrated control can be
used to energize second stage heat after either 7 minutes
or 12 minutes of first stage heat operation. See Table 12.
Switches 4 and 5 - Blower Off Delay - The blower On
delay of 30 seconds is not adjustable. The blower Off delay
(time that the blower operates after the heating demand
has been satisfied) can be adjusted by moving switches 4
and 5 on the integrated control. The unit is shipped from
the factory with a blower Off delay of 90 seconds. The
blower Off delay affects comfort and is adjustable to satisfy
individual applications. Adjust the blower Off delay to
achieve a supply air temperature between 90° and 110° F
at the exact moment that the blower is deenergized. Longer
Off delay settings provide lower supply air temperatures;
shorter settings provide higher supply air temperatures.
Table 11 provides the blower Off timings that will result
from different switch settings.
Blower Off Delay
(Seconds)
60
90 (factory)
120
180
Table 11. Blower Off Delay Switch Settings
Indoor Blower Operation DIP Switch Settings
Switches 6 and 7 - Continuous Indoor Fan Operation -
Blower Speed - The unit is shipped from the factory with
the DIP switches positioned for medium low (38%) speed
during continuous indoor blower operation. Continuous fan
setting is 38% of cool setting and is not adjustable.
Switches 8 and 9 - Cooling Mode Blower Speed - The
unit is shipped from the factory with the DIP switches
positioned for high speed (4) indoor blower motor operation
during the cooling mode. Table 13 provides the cooling
mode blower speeds that will result from different switch
settings.
Switch 1
OFF
ON
OFF
Issue 2346
Switch 4
Off
Off
On
On
Switch 2
ON
2nd stage delay
OFF = 7 minutes
OFF
ON = 12 minutes
3rd stage delay
10 minutes fixed
OFF
Switch 5
On
Off
Off
On
Switch 3
OFF
OFF
508364-01
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