EMI WLHA - Manual (Page 23)

www.enviromaster.com 23 WLCA/WLHA High Wall Evaporator
Heat Pump with Electric Heat:
Select a thermostat that is compatible
with a single stage cooling, two-stage
heat, heat pump system. The thermostat
should have “R”, “Y”, “O”, “W (or W2)”
and “G” terminals. The thermostat may
also have a “C” terminal. If the indoor unit
is not equipped with electric heat then a
single stage heat pump thermostat is ad-
equate.
Fan Operation
The indoor unit utilizes a two-speed mo-
tor. The FAN button will allow the selection
of the desired fan speed setting (High or
Low). The wall thermostat will control the
call for fan operation (On or Off) through
the low volt terminals “R” and “G”.
After the room thermostat has been sat-
isfied and the call for fan has been re-
moved, the indoor fan to remain on for
an additional 60 seconds. This increases
efficiency by pulling the remaining energy
from the unit.
Some thermostats are equipped with an
“AUTO/ON” fan switch. When this switch
is placed in the “ON” position the indoor
fan will run continuous. When the switch
is in the “AUTO” position the indoor fan will
cycle with the call for heating or cooling.
Cooling operation:
The wall thermostat will control the call for
cooling operation (On or Off) through the
low volt terminals “R” and “Y”. After con-
necting the thermostat to the unit, place
the system switch in Cool mode. Adjust
the set-point temperature below the room
temperature. The compressor and fan
motors will start and cooling will begin.
Next, place the set-point temperature
above the room temperature. The outdoor
condenser will stop. The fan will operate
as described in Fan Operation.
Note:
Once the cooling has cycled off
or following a power outage, the com-
pressor will not start for at least three
minutes (See Short Cycle Protection).
Electric heat operation:
For remote thermostat operation with
electric heat the control must first be
configured properly (Remote – ON, Heat
source – “ON”). See: Configuration Inter-
face mode.
The wall thermostat will control the call for
electric heat operation (On or Off) through
the low volt terminals “R” and “W”. After
connecting the thermostat to unit, place
the system switch in Heat mode. Adjust
the set-point temperature above the room
temperature. The electric heat will ener-
gize along with the indoor fan motor. Heat-
ing will continue so long as the set-point
remains above room temperature. Next,
place the set-point temperature below
room temperature. The Electric heater will
switch off and the indoor fan will remain
on for an additional sixty seconds.
Note:
Once the heating has cycled off
or following a power outage, the heat-
ing will not resume for at least three
minutes (See Short Cycle Protection).
Optional Heat Pump With Electric
Heat
(2-stage heating):
For remote thermostat operation for two
stage heating including a heat pump
condenser and indoor electric heat, the
control must first be configured properly
(Remote – ON, Heat source – “ON”). See:
Configuration Interface mode.
The wall thermostat will control the call for
electric heat operation (On or Off) through
the low
Volt terminals “R” and “W” for
compressor (heat pump) heating through
terminals “R” and “Y”. After connecting the
two stage heating thermostat to the unit,
sEqUEnCE of opErAtion – WALL moUntEd tHErmostAt modE