WLCG/WLHG
High-Wall Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008111, Rev. G [06/18/10]
29
Wall Thermostat Operation
NOTICE
When power is first applied to the con-
trol or after a power outage there is a
three minute delay before the compres-
sor or electric heat will energize. This is
to protect the unit from short cycling due
to loss of power.
NOTICE
The controller must be configured with
Remote Thermostat ON
to operate us-
ing a wall thermostat. See (Figure 28,
Page 22) for details. (Remote Thermo-
stat OFF means the unit will be operated
by the unit-mounted controller.)
In remote thermostat mode,
the unit-
mounted keypad will have limited
capability
.
Some of the buttons will not be op-
•
erable — only the FAN and TIME
buttons will function.
The ability to clear the FILTER
•
CHECK warning will also be avail-
able by pressing the MODE and
FAN buttons simultaneously.
THERMOSTAT selection
EMI thermostats
EMI offers several wall thermostats that are
compatible with the EMI Series ductless split
system air handlers.
See the latest price list for a list of available
•
thermostats.
It is important to choose a thermostat that
•
will match the equipment selected.
For single-stage cooling or heating, choose
•
a single-stage heat/cool thermostat.
If an outdoor heat pump unit and an
•
indoor unit with electric heat have been
selected, then chose a two-stage heating,
single-stage cooling thermostat.
Field-supplied thermostats
When selecting a thermostat other than one
offered by EMI, it is important to choose a
24V thermostat that matches your applica-
tion.
EMI equipment is compatible with most
mercury bulb, digital or power-stealing ther-
mostats.
Cooling only
Select a thermostat that is compatible with a
cooling system.
The thermostat should have “R”, “Y” and “G”
terminals and may also have a “C” terminal.
Cooling only with electric heat
Select a thermostat that is compatible with a
cooling/electric heat system.
The thermostat should have “R”, “Y”, “W” and
“G” terminals. The thermostat may also have
a “C” terminal.
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 adequate.
