Trane GEV General Information, Unit Nameplate, Compressor Nameplate, Unit Description, Controls

General Information

Unit Nameplate

The unit nameplate is located on the outside of the control box access panel at the front of the unit. It includes the unit model number, serial number, electrical characteristics, refrigerant charge, and other pertinent unit data.

Compressor Nameplate

The nameplate for the compressors are located on the compressor shell.

Unit Description

Before shipment, each unit is leak test- ed, dehydrated, charged with refriger- ant and run tested for proper control operation.

Air-to-Refrigerant Coil

The air-to-refrigerant coil is aluminum fin, mechanically bonded to the cop- per tubing.

Water-to-Refrigerant Coil

The water-to-refrigerant coil is a cop- per or cupro-nickel (option) and steel tube (tube-within-a-tube)design, leak tested to assure there is no cross leak- age between the water tube (copper/ cupro-nickel) and refrigerant gas (steel tube).

Controls

The control system offered to con- trol the unit is a Basic 24 Volt control for the 1/2 through 5 ton sizes, a De- luxe 24 Volt control option for all unit sizes, a TracerTM ZN510, LonTalkTM certified control option for the 1/2 through 5 ton unit sizes, or a Tracer ZN524, LonTalk certified control op- tion for all unit sizes.

All power wiring to the equipment is made at the unit contactor for the 1/2 through 5 ton, and at the high voltage terminal block for the 6 through 25 ton. All low voltage wiring is made at the unit’s low voltage terminal board.

System Input Devices and Functions

A thermostat, zone sensor or building automation system is required to op- erate the water-source heat pump. The flexibility of having several mode ca-

pabilities depends upon the type of sensor and/or remote panel selected. Troubleshooting and connection dia- grams for the 24 Volt control systems may be located in the back of this man- ual. All digital control troubleshooting tips and connection diagrams are lo- cated in WSHP-IOP-2 (ZN510) or WSHP-PRB002-EN (ZN524).

Basic 24V Controls

Safety devices for equipment contain- ing the basic 24V control option in- clude a low pressure switch or suction line temperature sensor to prevent compressor operation during low tem- perature activity. The switch or sensor is set to activate at refrigerant pres- sures of 20 psig (1/2 to 5 ton units) or

7 psig (6 to 25 ton units) to fit most ap- plications.

A high pressure switch prevents com- pressor operation during high or ex- cessive discharge pressures exceeding 395 psig.

The lockout relay communicates the low or high pressure situation to the compressor to prevent operation. For units that contain a condensate over- flow switch option, a condensate over- flow situation will also be communicated to the compressor through the lockout relay if an over- flow condition exists. The relay may be reset at the thermostat, or by cy- cling power to the unit.

General alarm is accomplished through the lockout relay and is used in driving light emitting diodes (LEDs). This feature will drive dry contacts only, and cannot be used to drive field installed control inputs.

(option) Deluxe 24V Controls Units containing the Deluxe 24V con- trol design will incorporate a micro- processor-based control board. The Trane microprocessor board is factory wired to a terminal strip to provide all necessary terminals for field connec- tion. The deluxe board is equipped with a random start relay, anti-short cycle timer, brown out protection,

compressor disable, condensate over- flow, unit safety control, diagnostics and a generic relay (which may be available for field use). See page 56 for diagnostic information and thermostat connections.

(option) Tracer ZN510 or ZN524

Controls

The digital ZN510 and ZN524 control- ler is designed to support the 1/2 through 25 ton water-source heat pumps in either a standalone, peer-to- peer with a Tracer Loop Controller, or as a full building automation (open protocal) system. The 1/2 through 5 ton units that incorporate direct digital controls will typically come equipped with the ZN510 control board. The ex- ception to this would be if the equip- ment contained hot gas reheat, waterside economizer, or boilerless control with electric heat. The ZN524 digital control board is designed to in- terface and run these mechanical op- tions. All units over 5 tons would ship with the Tracer ZN524 control board.

For installation, operation and diag- nostics of the ZN510 and ZN524 WSHP-IOP-2 (ZN510) and/or WSHP- PRB002-EN (ZN524).

(option) Waterside Economizer Instructions for mechanical connec- tion of the waterside economizer to the water-source heat pump may be found in the dimensional section of this manual.

The waterside economizer is designed to begin economizing mode when wa- ter temperatures fall below the field adjustable temperature of 25, 35, 45, 55 or 65 F (for the Deluxe control op- tion), or below the programmed set- point (for the ZN524 control option).

When the temperature is less than the setpoint, fluid will flow into the econo- mizing coil, while simultaneously halt- ing mechanical operation of the compressor. Mechanical cooling will continue on a call for a second stage from the thermostat or system control.

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