WLCG/WLHG
High-Wall Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
26
P/N 240008111, Rev. G [06/18/10]
Unit-Mounted Controller Operation
(continued)
Room air sampling
If the room air sampling feature has been
enabled in configuration (see Figure 28,
Page 22.), then after the fan has been off for
the selected time, it will cycle on for a 60
second cycle.
The unit will circulate room air for 60
•
seconds to remove any temperature
stratification by the unit so the micropro-
cessor can determine an accurate room
temperature.
After the 60 second fan cycle time has
•
elapsed, and if the setpoint temperature
remains satisfied, the fan will cycle off.
COOL mode
For cooling operation first turn the unit on via
the ON/OFF button.
Select Cool mode via the MODE but-
•
ton.
The room temperature and set point
•
temperature will be displayed.
The setpoint temperature can be changed
•
with each successive press of the Up or
Down arrow buttons or by holding the
button in. Holding the button in will
change the temperature rapidly.
Place the setpoint temperature below the
room temperature.
The compressor will start and cooling will
•
continue for a minimum of two minutes
and as long as the setpoint remains below
room temperature.
Once the room temperature is satisfied for
•
at least 60 seconds and the two-minute
minimum run time has elapsed the com-
pressor will cycle off.
The fan will operate as described in Fan
•
operation, page 25.
NOTICE
Once the compressor is switched off,
or after a power outage, there is a three-
minute delay before the compressor will
re-start.
Optional
ELECTRIC HEAT
operation
(Non heat pump condenser units only and WLCG)
For operation with electric heat the control
must first be configured properly — heat
source ON, heat pump OFF. See (Figure 28,
Page 22).
For electric heat operation, first turn the unit
on via the ON/OFF button.
Select Heat mode via the MODE but-
•
ton.
The room temperature and setpoint tem-
•
perature will be displayed.
Press either the Up or Down arrow but-
•
tons to change the setpoint temperature.
The setpoint temperature will change by
•
one degree with each successive press of
the Up or Down arrow buttons. Holding
the button in will change the temperature
rapidly.
Place the setpoint temperature above room
temperature.
The electric heat will energize and heat-
•
ing will continue as long as the setpoint
remains above room temperature.
When the room temperature has been sat-
•
isfied for at least 60 seconds and the two
minute minimum on time has expired, the
electric heat will switch off.
The fan will operate as described in Fan
•
operation, page 25.
Optional
HEAT PUMP WITH
ELECTRIC HEAT
(Two-stage heating)
For heat pump operation with electric heat
the control must first be configured properly
