Friedrich 000 BTU'S, 9 service manual Thermostat Connections

Page 14

Remote Thermostat and Low Voltage Control

Connections (Continued)

Thermostat Connections

C

=

Common Ground

W

=

Call for Heating

Y

=

Call for Cooling

R

=

24V Power from Unit

GL

=

Call for Fan (Low Speed)

GH

=

Call for Fan (High Speed)

B

=

Reversing Valve Energized in heating mode

*If only one G terminal is present on thermostat, connect to GL for low fan or to GH for high fan operation.

NOTE: It is the installer’s responsibility to ensure that all control wiring connections are made in accordance with the Freidrich installation instructions. Improper connec- tion of the thermostat control wiring and/or tampering with the unit’s internal wiring can void the equipment warranty. Questions concerning proper connections to the unit should be directed to the factory: 210-357-4400.

Thermostat Configuration

An improperly configured t-stat can be the cause of improper operation. Ensure to correctly configure the t-stat (see owner’s manual).

Desk Control Terminals

The Friedrich VERT-I-PAK has built-in provisions for connection to an external switch to control power to the unit. The switch can be a central desk control system or even a normally open door switch.

For desk control operation, connect one side of the switch to the D1 terminal and the other to the D2 terminal (See figure 9). Whenever the switch closes, the unit operation will stop.

Maximum Wire Length for Desk Control Switch

Wire Size

Maximum Length

 

#24

400 ft.

 

#22

600 ft.

Note: The desk

#20

900 ft.

 

 

control system and

#18

1500 ft.

switches must be

#16

2000 ft.

field supplied.

Auxiliary Fan Control

The Smart Center also has the ability to control a 24VAC relay to activate an auxiliary, or transfer, fan. The outputs are listed as F1 and F2 on the control board.

To connect the relay, simply wire one side of the relay to F1 and the other side to F2. Anytime that the fan runs, the terminals will send a 24VAC signal to the relay. The relay must be 24 VAC, 50mA or less.

Note: The relay and auxiliary fans must be field supplied.

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Contents Single Package Vertical Air Conditioning System Technical Support Contact Information Table of Contents Important Safety Information Your safety and the safety of others are very importantRefrigeration System Hazards Introduction Property Damage HazardsSerial Number Identification Guide Chassis Specifications Electric Heat DataExtended Cooling Performance VEA Extended Cooling PerformanceVEA/VHA09-24 VEA Extended Cooling Performance Electrical Requirements Electric Shock HazardRemote Thermostat and Low Voltage Control Connections RT5 Two speed fan RT4 One speed fanThermostat Connections Electronic Control Board Features Quiet Start/StopElectronic Control Configuration Test Mode Electronic control error codes diagnostics and test modeDiagnostics Power On and Off Features on the Electronic Control Cool mode control features for cool with electric heat units Compressor operation depends on t-stat settings Component description / A-Series specifications VERT-I-PAK Single Packaged Vertical AIR ConditionersExternal Static Pressure Indoor Airflow Data Capacitor Check with Capacitor Analyzer Components TestingCapacitors Capacitor ConnectionsDrain PAN Valve Components TestingHeater Elements and Limit SWITCHES’ Specifications Refrigeration Assembly Refrigeration Sequence of OperationService CUT/SEVER HazardEquipment Must be Capable Sealed Refrigeration System RepairsEquipment Required Risk of Electric ShockFreeze Hazard Method Of Charging / RepairsBurn Hazard Undercharged Refrigerant Systems Overcharged Refrigerant SystemsRestricted Refrigerant System Check Valve Hermetic Components CheckMetering Device Capillary Tube SystemsReversing Valve DESCRIPTION/OPERATION Testing the Coil Checking the Reversing ValveFire Hazard Procedure For Changing Reversing ValveTouch Test in Heating/Cooling Cycle Explosion HazardCompressor Checks Checking Compressor Efficiency Single Phase Resistance TestGround Test High Temperatures Compressor ReplacementRecommended procedure for compressor replacement Rotary Compressor Special Troubleshooting and Service Blower Wheel / Housing / Condenser FAN / Shroud Routine MaintenanceCoils and Base PAN Excessive Weight Hazard AIR FilterFront Cover Routine MaintenanceSleeve / Drain Condensate Disposal SystemElectrical Troubleshooting Chart Cooling 9K BTU, 12K BTU, & 18K BTUElectrical Troubleshooting Chart Cooling 24K BTU Circuit Breakers areElectrical Troubleshooting Chart Heat Pump Heat Pump ModeTroubleshooting Chart Cooling Troubleshooting Chart HeatingVEA 09/12/18 with 2.5 KW, 3.4 KW or 5KW Electric HeatVHA 09/12/18 with 2.5 KW, 3.4 KW or 5KW Cool with Electric Heat Heat Pump with Electric Heat Cool with Electric Heat Heat Pump with Electric Heat Outdoor Coil Return Air Indoor Coil Drain PAN AccessoriesWall Plenum Friedrich Air Conditioning Company Technical Support Contact Information Friedrich AIR Conditioning CO