EMI WLHA, S1C manual Other Features, Short Cycle Protection Asct, LCD Back Light, Drain Pan Sensor

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.

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