INSTALLATION GUIDE
Page 4
EFM / ELB Series Installation Guide
START UP
Once all connections are completed, the unit should be
started up and a check of the completed system should
be performed. Before performing any system test make
sure that all grilles, registers and dampers are open and
set to the correct positions. Also make certain that an air
filter is installed in the return air prior to the Air Handler.
A performance test should be completed in accordance
with the outdoor equipment
manufacturer’s instructions.
Airflow test should be conducted in the heating and
cooling modes to ensure satisfactory operation.
MAINTENANCE
The system air filter(s) should be inspected, cleaned or
replaced at least monthly. If the filter is mounted internal
to unit, make sure that electrical power is disconnected
before removing the access panels. Make certain that
the access panels are replaced and secured properly
before placing the unit back in operation. This product is
designed for dependable service; however, periodic
maintenance should be scheduled to be conducted by
trained professional service personnel. This service
should be conducted at least annually, and should
include testing and inspection of electrical and
refrigerant components. The heat transfer surface
should be cleaned. The blower motor is permanently
lubricated for normal operating conditions.
SEQUENCE OF OPERATION
Cooling (cooling only or heat pump with reversing
valve energized in heat mode):
When the thermostat
calls for cooling, the blower relay is energized. The N.O.
contacts will close after a time delay,
and
the indoor
blower will operate. The circuit between R and Y is
complete
which
caus
es
the contactor on the outdoor
equipment to close
,
and start the compressor and the
outdoor fan motor.
Cooling (heat pump with reversing valve energized
in cooling mode):
When the thermostat calls for
cooling, the circuit between R and G and R and O is
complete. Circuit R and O energizes the reversing
valve to the cooling position, Circuit R and G energizes
the
blower relay. The N.O. contacts will close after a
time delay,
and
the indoor blower will operate. The
circuit between R and Y is complete
, which
caus
es
the
contactor on the outdoor equipment to close and start the
compressor and the outdoor fan motor.
Heating (electric heat only):
When the thermostat calls
for heat the circuit between R and W is complete,
and
the heat sequencer is energized. A time delay will
occur
which allows
the heating element(s) and the
indoor blower motor
to
come on.
Heating (heat pump reversing valve energized in
heat mode):
When the thermostat calls for heat, the
circuits between R and B, R and Y
,
and R and G are
complete. Circuit R and B energize the reversing valve
switching it to the heat position. Circuit R and Y
energized the outdoor unit contactor starting the
compressor and outdoor fan. Circuit R and G energizes
the blower relay starting the blower motor.
If the indoor room temperature should continue to fall,
circuit R and W2 is by the second-stage heat bulb on the
thermostat. Circuit R-W2 energizes the heat sequencer.
The completed circuit will energize the supplemental
electric heat.
Blower Time Delay:
This unit is equipped with timed on
and a timed off relay. This relay delays the start and
delays the stopping of the indoor fan motor to maximize
the efficiency of the unit.
Defrost:
When the unit starts the defrost cycle
s
upplemental heat during defrost can be provided by
connecting B on the blower coil to the defrost relay
on the outdoor heat pump. This will complete the
circuit between R and B in the blower coil
,
through a set
of contacts in the defrost relay in the outdoor unit.
This circuit, when it is connected, will help prevent cold
air from being discharged from the indoor unit during
the defrost mode.
WARNING:
Do not store or use any
corrosives or combustibles in the vicinity of this
unit. All panels must be in place and properly
secured before operating this equipment.
All electrical power servicing this unit must be
disconnected prior to removal of any panels.
Service of this unit must be accomplished by
qualified trained professional personnel only.
