EMI WLHG09 - Wall Thermostat Operation

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 rst applied to the con-
trol or aer a power outage there is a
three minute delay before the compres-
sor or electric heat will energize. is is
to protect the unit from short cycling due
to loss of power.
NOTICE
e controller must be congured with
Remote Thermostat ON to operate us-
ing a wall thermostat. See (Figure 28,
Page 22) for details. (Remote ermo-
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 buons will not be op-•
erable  only the FAN and TIME
buons will function.
The ability to clear the FILTER •
CHECK warning will also be avail-
able by pressing the MODE and
FAN buons simultaneously.
THERMOSTAT selection
EMI thermostats
EMI oers 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
oered 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.
e 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.
e thermostat should have “R”, “Y”, “W” and
“G” terminals. e 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.
e thermostat should have “R”, “Y”, “O”, “W
(or W2)” and “G” terminals. e 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.