Table of Contents
Advertisement
speed to maintain the temperature rise within the range
shown on the unit nameplate. See Table 19 for allowable
heating speeds. Increase the blower speed to decrease
the temperature. Decrease the blower speed to increase
the temperature rise. Failure to adjust the temperature rise
may cause erratic limit operation.
Fan Control
Ignition Control 103217-03
The fan on time of 45 seconds is not adjustable. The heat
fan off delay (amount of time that the blower operates after
the heat demand has been satisfied) may be adjusted by
changing the jumper position across the five pins on the
integrated control. The unit is shipped with a factory fan
off delay setting of 90 seconds. The fan off delay affects
comfort and is adjustable to satisfy individual applications.
Adjust the fan off delay to achieve a supply air temperature
between 90° and 110° F at the moment that the blower
is de-energized. Longer off delay settings provide lower
return air temperatures; shorter settings provide higher
return air temperatures. See Figure 68.
Ignition Control 107163-01
The heat fan-on time of 30 seconds is not adjustable The
heat fan-off delay (amount of time that the blower operates
after the heat demand has been satisfied) may be adjusted
by changing the two position dip switch on the integerated
control, to one of four slections. Blower off delay is factory
set at 90 seconds. For other blower off delay settings,
please refer to Table 18.
60
90*
120
180
* Factory setting
Table 18. Blower Delay Select
NO JUMPER
To adjust fan-off timing, reposition jumper across pins to
achieve desired setting.
60 Second
90 Second
off Time
off Time
Figure 68. Heat Fan Off Time in Seconds
507768-05G / 31-5000655
SW2-1
SW2-2
OFF
ON
OFF
OFF
ON
OFF
ON
ON
120 Second
180 Second
off Time
off Time
Constant Torque Motor
These units are equipped with a constant torque ECM
motor. It has a DC motor coupled to an electronic control
module both contained in the same motor housing. The
motor is programmed to provide constant torque at each of
the five selectable speeds. The motor has five speed taps.
Each tap requires 24 volts to energize.
Thermostat Heat Anticipation
Set the heat anticipator setting (if adjustable) according to
the amp draw listed on the wiring diagram that is attached
to the unit.
Electrical
1.
Check all wiring for loose connections.
2.
Check for the correct voltage at the furnace (with
furnace operating). Correct voltage is 120 VAC ± 10%
3.
Check amp–draw on the blower motor with the blower
access panel in place.
Motor Nameplate____________Actual____________
Blower Speeds
Follow the steps below to change the blower speeds.
1. Turn off electrical power to furnace.
2.
Remove blower access panel.
3.
Disconnect existing speed tap at control board speed
terminal.
NOTE: Termination of any unused motor leads must
be insulated.
4.
Place unused blower speed tap on integrated control
"PARK" terminal or insulate.
5.
Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data beginning on the next page.
See Table 19 for allowable heating speeds.
6.
Connect selected speed tap at control board speed
terminal.
7.
Re-secure blower access panel.
8.
Turn on electrical power to furnace.
9.
Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal
soft lockout control. The feature serves as an automatic
reset device for integrated control lockout caused by
ignition failure. This type of lockout is usually due to low
gas line pressure. After one hour of continuous thermostat
demand for heat, a soft lockout will break and remake
thermostat demand to the furnace and automatically reset
the integrated control to begin the ignition sequence.
Issue 2223
Page 49 of 56
Advertisement
Table of Contents
