10
Complete Installation
Pre-Start Check
■
Is unit properly located, level, secure, and serviceable?
■
Is the wiring neat, correct, and to the wiring diagram?
■
Is the unit properly grounded and protected (fused)?
■
Is the thermostat correctly wired, level, and in a good
location?
■
Are all access panels in place and secure?
Check Airflow
The Control Board
The control board regulates airflow selection and features LED
indicators that display operating mode, humidity control, and
airflow CFM. The red LED flashes once for each 100 CFM. For
example, if the operating CFM is 1200, the CFM LED will flash 12
times, then pause before repeating the 12-flash pattern.
Thermostat signals for emergency heat (EM), auxiliary heat (W1),
reversing valve (O), compressor (Y1), and blower (G) are all
indicated by lit LED’s on this board.
This model is designed for use with heat pumps as well as air
conditioning systems. The control board needs to sense a signal
on the “O” thermostat wire in order to use cooling delay timing.
For a straight air conditioning system, connect the “O” wire to the
24 volt “R” wire.
1. Disconnect all power supplies.
2. Locate the control board in the blower control box.
3. Set the HEAT and COOL taps by moving the board jumpers
to the A, B, C, or D positions (see Motor Board Taps and
Dehumidify Resistor) based on the information found in the
Application Table.
NOTE: If using a humidistat, the dehumidify resistor located
on the bottom right of the control board must be removed to
enable it. See Control Board Taps and Dehumidify Resistor.
The HUM terminal on the board must be connected to the
Normally Closed contact of the humidistat so that the board
senses an open circuit on high humidity. If a humidistat is
used, the dehumidify LED (see D1 below) will light when the
humidistat opens and the motor runs at reduced airflow.
Control Board Taps and Dehumidify Resistor.
4. If desired, adjust ADJUST tap from NORM: (+) will increase
airflow by 10% or (-) will decrease airflow by 12%
5. Reconnect all power supplies.
Application Table
The versatility of the variable speed motor enables the electric
furnace to tailor its performance to the different modes of
operation encountered in heating and cooling. All variable speed
electric furnaces are capable of operation at more than one
nominal airflow rate.The operation of a variable speed electric
furnace blower at different airflow rates is determined by the
control board taps and the thermostat. See the Application Table.
Before beginning the setup, become familiar with the information
found in the Application Table. The data in the application table is
categorized by model size and mode of operation. Use the
information provided to determine the CFM taps needed for
cooling and heating.
WARNING
Electrical Shock Hazard
Disconnect all power supplies before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
1. Dehumidify LED
2. Dehumidify resistor
DEHUMIDIFY
CUT TO ENABLE
COOL
HEAT
ADJUST
NORM
A
B
C
D
A
B
C
D
(+)
(–)
TEST
D1
1
2
Содержание WEFV08S-1A
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