Page 60 of 83
SK2018 PCG(H)-V/P-AECM-001
D.13.
Drain Pump
Drain pump turns ON if the thermostat activates cut in during cooling or dehumidification cooling cycles. It
remains on for at least 5 minutes after the thermostat stops cut out. During mode change from cooling to non-
cooling mode, the water pump will turn on for a minimum of 5 minutes.
D.14.
Float Switch
Float-switch opens before unit is turned on
If the float switch (N/C) is opened before the unit is turned on, then MTV1 is turned off. The drain pump and indoor fan
will operate.
After float switch is closed, MTV1 is turned on.
Float switch is opened, when unit is turned on
If the float switch is opened continuously ≥ 5 seconds, then the drain pump will work and MTV1 will remain off.
After the float switch is closed, the drain pump will run for an additional 5 minutes. If the float switch is opened for 10
minutes continuously, then MTV1 will remain off. The indoor fan runs at set speed and the system reports an error.
Float switch is opened, when unit is turned off
If the float switch is opened, then the drain pump will work.
After the float switch is closed, the drain pump will run for an additional 5 minutes. If the float switch is opened for 10
minutes continuously, then the system reports an error.
D.15.
Electric Heater Safety Switch
Before the electrical heater is turned on, the EH safety switch must be closed and the fan motor RPM be more than
300RPM.
If this contact is opened for ≥ 1 second or the fan RPM is less than 300RPM, the heater will be turned off immediately
and report an error.
Once the contact is returned to the closed position ≥ 60 seconds, reset the error and the heater will start again.
When the EH safety switch is opened ≥ 3 times within 60 minutes, the heater is not allowed to start anymore.
Turn off the unit to reset the fault, provided that the switch has returned to the closed position.
D.16.
Low Temperature Protection of Indoor Coil in Winter
This is frost protection for when the unit is off to prevent water in the coil and room from freezing.
If Unit with SW2=0 (2-pipe system), is in Standby Mode
If Tr
≦
35.6ºF for 2 minutes
1.
MTV1 is turned ON
2.
AUX1 is closed
3.
DA2 is 10 VDC
4.
If Ti1 < 41ºF for 2 minutes EH (if present) is switched ON
5.
Indoor fan is turned on at low speed
CAUTION
If the system is turned off at the circuit breaker (or main power supply), the drain pump
will not work.
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