- 32 -
troubleshooting Guidelines
(CoNt’D)
Symptom
Potential
Problem
Solution
The motor is
running but there is
not enough airflow
causing any of the
following:
Proper heating
temperature rise
or cooling/heat
pump CFM cannot
be achieved
oR
The indoor coil
is freezing in the
cooling mode
oR
The head pressure
switch is tripping in
the heating mode
(heat pumps)
oR
The electric strips
are tripping on
thermal overload
oR
The main limit
is tripping.
WARNING:
ALWAYS
DISCONNECT
MAIN HVAC
SYSTEM POWER
BEFORE DIS-
CONNECTING OR
RE-CONNECTING
ANY WIRES OR
CONNECTORS TO
THE EVERGREEN
MOTOR.
The motor is
running the
wrong direction.
Go to page 34 “The motor is operating in
the wrong direction”.
The wrong
motor was
selected.
This motor is designed to replace multiple
motors based on horse power and
system sizing. If the sizing of the motor is in
question, please see page 30 “Selecting
the Correct Replacement Motor”.
CAUtIoN: Do not install the larger motor
to solve an airflow problem. This could
cause many other worse problems
including rotation issues, noise and hub
failure. If the motor is properly sized, see
the next section on “Airflow Restrictions”.
There is
an airflow
restriction in the
HVAC system.
Airflow restrictions can be caused by any
one or more of the following:
• Dirty filters.
• Dirty blower wheel, secondary heat
exchanger and/or evaporator coil.
• Too many registers, grilles and/or
balancing dampers closed.
• Dirty, damaged, or poorly constructed
ductwork.
All of these issues can be solved by visual
inspection and cleaning. If this does not
solve the problem continue here.
Check the Total External Static Pressure
(TESP) only after the issues listed above
have been checked and corrected.
If the TESP is above .8, there is an issue
with the ductwork or filter sizing that must
be corrected.
After correcting one or more airflow
restrictions, it may be possible to lower the
speed selection.
®
I
Evergreen IM manual 01-13.indd 32
2/13/13 11:12 AM
