EMI WLHA - Manual (Page 24)

www.enviromaster.com WLCA/WLHA High Wall Evaporator 24
sEqUEnCE of opErAtion – WALL moUntEd tHErmostAt modE
place the system switch in Heat mode.
Adjust the set-point temperature above
the room temperature. The compres-
sor and fan motors will start and heating
will begin. Depending on the thermostat
selected, electric heat will also energize
when the deviation between room tem-
perature and set point temperature is high
enough to call for second stage heating.
(See the thermostat owner’s manual for
this feature) Place the set-point tempera-
ture below the room temperature. The
outdoor condenser and electric heat will
stop while the indoor fan will remain on for
an additional sixty seconds.
other features
Short Cycle Protection (ASCT):
The electronic control incorporates an
anti-short cycle timer (ASCT) feature de-
signed to protect the compressor from
short cycling. The ASCT is activated im-
mediately following the off cycle of the
outdoor unit. Once the room temperature
is satisfied and the outdoor unit switches
off, the ASCT will not allow the outdoor to
restart unit a three-minute time period has
elapsed.
This feature will prevent the compres-
sor and heat source from rapid re-starts.
Once switched off, including following a
power outage, the compressor or heat
source shall not re-start for a minimum of
three minutes.
Staggered Start Protection:
Designed for systems with electric heat,
in heat pump and dry modes the stag-
gered start feature will prevent the com-
pressor and electric heater from starting
simultaneously. There is a thirty-second
delay between the start of the compres-
sor and start of the electric heater while in
Dry mode and Heat pump mode.
Minimum Run Time:
Once started, the minimum on time pre-
vents either the compressor or heat
source from cycling off prematurely. The
minimum ON time for both the compressor
and electric heat is two minutes. Minimum
on time is available only while the control
is configured for Unit mounted keypad op-
eration. Minimum on times are disables
while in Remote thermostat mode.
LCD Back Light:
The LCD display can be illuminated using
the LCD back light feature. The selectable
settings are “Off”, “On”, and “Intermittent”
and can be set in the Configuration mode.
By selecting “Off” the backlight will remain
off at all times. By selecting “On” the back-
light will remain on at all times including
while in the Off mode interface. If “Inter-
mittent” is selected, the backlight will re-
main for 10 seconds after the push of any
button while the control is in the On mode
or after the push of the “ON/OFF” button
while in the Off mode interface.
Drain Pan Sensor:
The drain pan sensors monitor the con-
densate level in each of the units drain
pans. Should the water in either pan
reach a critical level, the monitor will auto-
matically signal the main control unit. The
controls microprocessor will in turn switch
off the condensing unit for a minimum of
three minutes and until the fault condi-
tion has been cleared, to prevent further
condensate production. A fault code “E02”
will then flash on the controls LCD display
and will automatically reset once the fault
condition is cleared.
Annunciation:
The unit is equipped with an annunciation
feature where by the control will beep pro-
viding the user with audio feedback confirm-
ing that the microprocessor has received its
commands. The annunciation feature must
be activated in the Configuration mode. The
selections are “Off” and “On”. If “Off” is se-
lected, annunciation will remain off. If “On”
is selected then annunciation will beep with
the push of any button in the On mode or
with the push of the “ON/OFF” button while
in the Off mode interface.