EMI S1C, WLHA manual Cooling operation, Electric heat operation

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Sequence of Operation – Wall mounted thermostat mode

Heat Pump with Electric Heat: Select a thermostat that is compatible with a single stage cooling, two-stage heat, heat pump system. The thermostat should have “R”, “Y”, “O”, “W (or W2)” and “G” terminals. The 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 ad- equate.

Fan Operation

The indoor unit utilizes a two-speed mo- tor. The FAN button will allow the selection of the desired fan speed setting (High or Low). The wall thermostat will control the call for fan operation (On or Off) through the low volt terminals “R” and “G”.

After the room thermostat has been sat- isfied and the call for fan has been re- moved, the indoor fan to remain on for an additional 60 seconds. This increases efficiency by pulling the remaining energy from the unit.

Some thermostats are equipped with an “AUTO/ON” fan switch. When this switch is placed in the “ON” position the indoor fan will run continuous. When the switch is in the “AUTO” position the indoor fan will cycle with the call for heating or cooling.

Cooling operation:

The wall thermostat will control the call for cooling operation (On or Off) through the low volt terminals “R” and “Y”. After con- necting the thermostat to the unit, place the system switch in Cool mode. Adjust the set-point temperature below the room temperature. The compressor and fan motors will start and cooling will begin. Next, place the set-point temperature above the room temperature. The outdoor condenser will stop. The fan will operate as described in Fan Operation.

Note: Once the cooling has cycled off or following a power outage, the com- pressor will not start for at least three minutes (See Short Cycle Protection).

Electric heat operation:

For remote thermostat operation with electric heat the control must first be configured properly (Remote – ON, Heat source – “ON”). See: Configuration Inter- face mode.

The wall thermostat will control the call for electric heat operation (On or Off) through the low volt terminals “R” and “W”. After connecting the thermostat to unit, place the system switch in Heat mode. Adjust the set-point temperature above the room temperature. The electric heat will ener- gize along with the indoor fan motor. Heat- ing will continue so long as the set-point remains above room temperature. Next, place the set-point temperature below room temperature. The Electric heater will switch off and the indoor fan will remain on for an additional sixty seconds.

Note: Once the heating has cycled off or following a power outage, the heat- ing will not resume for at least three minutes (See Short Cycle Protection).

Optional Heat pump with Electric heat (2-stage heating):

For remote thermostat operation for two stage heating including a heat pump condenser and indoor electric heat, the control must first be configured properly (Remote – ON, Heat source – “ON”). See: Configuration Interface mode.

The wall thermostat will control the call for electric heat operation (On or Off) through the low volt terminals “R” and “W” for compressor (heat pump) heating through terminals “R” and “Y”. After connecting the two stage heating thermostat to the unit,

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Contents Installation, operation and maintenance Manual To the Installer Safety Instructions Anti-Short Cycle Compressor Pro- tection Day programmable with copy featureProduct Description Controls and ComponentsOptional Equipment Cabinet FeaturesInstaller Supplied Items WLCA/WLHA Controls and ComponentsWLCA/WLHA High Wall unit Mounting WLCA/WLHA Mounting preparationLocate Electrical Wiring WLCA/WLHA High Wall Evaporator Installation InstructionsElectrical Wiring Site Preparation Make sure power is offUnits With or without heat High Volt Electrical WiringLow Volt Interconnect wiring Wiring must be at least 18 awgChoosing a Remote Wall Mounted Straight CoolHeat pump connection Remote thermostat Two-stage Heating Piping Do’s and Don’ts Refrigerant PipingWLH24 Piston/Orifice Installation InstructionManifold Setup For Evacuation Charge to proper weight, charge WLCA/WLHA High Wall Evaporator User interface Buttons Quick Guide Configuration ModeControl User Interface instructions User interface Buttons Louver operation Mode of operationOn/Off Fan OperationOptional Heat pump with Electric heat 2-stage heating Sequence of Operation Unit Mounted key pad modeCool Mode Heat ModeSet Time Mode Dry ModeFilter Check Day Programming modePre-programmed run mode Manual runMin, 10 min, and 15 min Room Air Sampling Configuration ModeChoosing a Thermostat Sleep timerSequence of Operation Wall mounted thermostat mode Electric heat operation Cooling operationDrain Pan Sensor Other FeaturesShort Cycle Protection Asct LCD Back LightID coil sensor fault E03 Memory BackupRoom air sensor fault E01 Condensate fault E02WLCA/WLHA Preperation for Start-Up Optional Hand Held Controller programmingInitial Start-up Test Unit Performance Data Test Unit Performance Data sheetMaintenance Maintenance and Troubleshooting procedureEMI Air handlers with Unit Mount Infrared Controls TroubleshootingPower supply check Troubleshooting procedureOptional Heat pump With Electric Heat Low volt controlsCooling Only Units Electric HeatUnits with Condensation Pumps Display on the indoor unit is blank What should I do? Frequently asked questionsTroubleshooting procedure Mounting Tubing Model Depth Height Length WLCA/WLHA Physical DimensionsMedium Cabinet 18/24 WLCA/WLHA High Wall Evaporator SpecificationsWLCA/WLHA Electrical Specifications Small Cabinet 09/12Cooling Systems with S2CA Side discharge WLCA/WLHA System OptionsCooling Systems with Wall Units Heat pumps System Options with Wall UnitsSystem Options with T3CA TOP discharge System Options with T2CA TOP dischargeALL Product Limited Warranty Condensers EMI’s High Efficiency Product LineEvaporators High Wall Evaporator

WLHA, S1C specifications

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