Trane GECA-015 Installation Operation & Maintenance

Trane Axiom

™

Water-Source

Comfort System

Standard Efficiency

Console Model GECA

(50 Hz)

WSHP-PRC004-EN

February 2001

WSHP-PRC004-EN©American Standard Inc. 2001

Introduction

Another Solution by Trane

Trane has developed another system

solution to add to their exceptional

water-source product line. Introducing

the Trane Axiom

™

(Model GECA) water-

source comfort system.

The attractive sloped top design

provides both fundamental performance

requirements, exceptional quality, and

added features to enhance maintenance-

ability and sound attenuation.

The design offers:

•

Dual sloped plastic drain pan

•

Hot gas reheat

(option)

•

Electric heat

(option)

•

Internal mount loop pump kit

(option)

•

Motorized 25% outside-air

(option)

•

Disconnect switch

(option)

•

Field adjustable supply-air grille

•

Integrated controls

•

Quiet unit design

•

Panel free filter maintenance

•

High and low pressure switches as

standard

•

Compact size

3

WSHP-PRC004-EN

Introduction

Model Number Description

General Data

Features and Benefits

Performance Data

Fan

Sound

Control Wiring

Dimensional Data

Accessories

Mechanical Specifications

Contents

2

4

5

6

24

42

43

46

49

58

64

WSHP-PRC004-EN4

Model Number

Description

DIGITS 1-3: UNIT CONFIGURATION

GEC = General Efficiency Console

DIGIT 4: DEVELOPMENT SEQUENCE A

DIGITS 5-7: NOMINAL SIZE (MBH)

006 = 6.0 MBH

009 = 9.0 MBH

012 = 12.0 MBH

015 = 15.0 MBH

DIGIT 8: VOLTAGE (Volts/Hz/Phase)

6 = 220-240/50/1

DIGIT 9: HEAT EXCHANGER

1 = Copper Water Coil

2 = Cupro-nickel Water Coil

DIGIT 10: DESIGN SEQUENCE

A = First Design

DIGIT 11: REFRIGERATION CIRCUIT

0 = Heating and Cooling Circuit

2 = Heating and Cooling Circuit w/ Hot Gas

Reheat

A = Cooling ONLY Circuit

C = Cooling ONLY Circuit w/ Hot Gas Reheat

DIGIT 12: BLOWER CONFIGURATION

1 = Standard Blower

DIGIT 13: CUSTOMER CHANNEL

1 = Boiler / Tower Design

2 = Geothermal Design

5 = International Design

DIGIT 14: OPEN DIGIT

0 = Standard Design

DIGIT 15: SUPPLY-AIR ARRANGEMENT

0 = Standard Supply-Air Arrangement

DIGIT 16: RETURN-AIR ARRANGEMENT

0 = Standard Return-Air Arrangement

DIGIT 17: CONTROL TYPES

0 = Basic 24V Controls

D = Deluxe 24V Controls

C = Tracer ZN.510 Controls

A = TUC Stand-alone Controls

T = TUC/ICS Control

DIGIT 18: T’STAT/SENSOR LOCATION

0 = Wall Mounted Location

1 = Unit Mounted Location with Standard

Entry

2 = Unit Mounted Location with Keylock Entry

DIGIT 19: FAULT SENSORS

0 = No Fault Sensor

1 = Condensate Overflow Sensor

2 = Filter Maintenance Timer

3 = Condensate Overflow and Filter

Maintenance Timer

4 = Fan Status Sensor

5 = Dirty Filter Sensor

6 = Condensate Overflow and Fan Status

Sensor

7 = Condensate Overflow and Dirty Filter

Sensor

8 = Fan Status and Dirty Filter Status Sensor

9 = Fan Status, Dirty Filter Status and

Condensate Overflow Sensor

DIGIT 20: TEMPERATURE SENSOR

0 = No Additional Temperature Sensor

1 = Entering Water Sensor

2 = Return-Air/Mixed-Air Temperature Sensor

3 = Entering Water/Mixed-Air

Temperature Sensor

DIGIT 21: NIGHT SETBACK

0 = No Night Setback Relay

N = Night Setback Relay

DIGIT 22: ELECTRIC HEAT OPTION

0 = No Electric Heat

2 = Boilerless Control/Electric Heat (minimum)

3 = Boilerless Control/Electric Heat

(maximum)

DIGIT 23: UNIT MOUNTED DISCONNECT

0 = No Unit Mounted Disconnect

A = Power Cord/Receptacle Box Disconnect

B = Power Cord/Receptacle Box Disconnect

with Circuit Breaker

DIGIT 24: FILTER TYPE

0 = No Filter (Chassis ONLY)

1 = 1-inch [25.4 mm] Throwaway Filter

DIGIT 25: ACOUSTIC ARRANGEMENT

0 = Sound Attenuation Package

DIGIT 26: FACTORY CONFIGURATION

0 = Standard Factory Configuration (chassis,

cabinet, and subbase)

1 = Chassis ONLY

2 = Low Height Factory Configuration

(chassis, cabinet, and subbase)

3 = Extended Length Factory Configuration

(chassis, cabinet, and subbase)

DIGIT 27: PAINT COLOR

0 = No Paint Selection Available (chassis

ONLY)

1 = Deluxe Beige

2 = Cameo White

3 = Soft Dove

DIGIT 28: OUTSIDE AIR OPTION

0 = No Outside Air

1 = Outside Air Opening

2 = Motorized Outside Air Option (2-position)

DIGIT 29: PIPING ARRANGEMENT

L = Left Hand Piping Arrangement

R = Right Hand Piping Arrangement

2 = Left Hand Piping Arrangement with

Internal Mounted Loop Pump Kit

3 = Right Hand Piping with Internal Mounted

Loop Pump Kit

DIGITS 30-36: DOES NOT APPLY TO THE

CONSOLE PRODUCT

0000000 = Digits 30-36 Does NOT Apply to

the Horizontal/ Vertical Products

Water-Source Comfort System

GEC A 012 6 1 A 0 1 1 0 0 0 D 0 1 0 N 0 0 1 0 0 1 0 L 000000

1-3 4 5-7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30-36

5

WSHP-PRC004-EN

General Data

Table GD-1 – Physical Data (GECA 006-009)

Model: GECA 006-009 006 009

Unit Size Length of cabinet (in) [mm] 48 or 63 [1219 or 1600] 48 or 63 [1219 or 1600]

Height (in) [mm] 25 or 22 1/2 [635 or 571] 25 or 22 1/2 [635 or 571]

Width (in) [mm] 12 [305] 12 [305]

Compressor Type Rotary Rotary

R-22 Refrigerant (lbs) [kg] Heating and Cooling 1.19 [.54] 1.22 [.55]

Cooling Only 1.06 [.48] 1.16 [.53]

Hot Gas Reheat n/a 1.375 [.62]

Approximate Weight without Pallet (lbs) [kg] Unit 192 [87.1] 204 [92.5]

Chassis Only 144 [653] 156 [70.8]

Approximate Weight with Pallet (lbs) [kg] Unit 222 [100.7] 234 [106]

Chassis Only 174 [78.9] 186 [84.4]

Filter Size (standard height - 25" [635 mm]) 1 x 10 x 32 3/8 [25.4 x 254 x 822] 1 x 10 x 32 3/8 [25.4 x 254 x 822]

Filter Size (low height - 22 1/2" [571 mm]) 1 x 7 3/4 x 30 5/8 [25.4 x 197 x 779] 1 x 7 3/4 x 30 5/8 [25.4 x 197 x 779]

Blower Wheel Size (in) [mm] (2) 5 1/4 x 8 1/8 [133 x 206] (2) 5 1/4 x 8 1/8 [133 x 206]

Table GD-2 – Physical Data (GECA 012-015)

Model: GECA 012-015 012 015

Unit Size Length of cabinet (in) [mm] 48 or 63 [1219 or 1600] 48 or 63 [1219 or 1600]

Height (in) [mm] 25 or 22 1/2 [635 or 571] 25 or 22 1/2 [635 or 571]

Width (in) [mm] 12 [305] 12 [305]

Compressor Type Rotary Rotary

R-22 Refrigerant (lbs) [kg] Heating and Cooling 1.75 [.79] 2.44 [1.1]

Cooling Only 1.5 [.68] 1.88 [.85]

Hot Gas Reheat n/a n/a

Approximate Weight without Pallet (lbs) [kg] Unit 203 [92.1] 210 [92.3]

Chassis Only 155 [70.3] 162 [73.5]

Approximate Weight with Pallet (lbs) [kg] Unit 233 [106] 240 [99.8]

Chassis Only 185 [83.9] 192 [87.1]

Filter Size (standard height - 25" [635 mm]) 1 x 10 x 32 3/8 [25.4 x 254 x 822] 1 x 10 x 32 3/8 [25.4 x 254 x 822]

Filter Size (low height - 22 1/2" [571 mm]) 1 x 7 3/4 x 30 5/8 [25.4 x 197 x 779] 1 x 7 3/4 x 30 5/8 [25.4 x 197 x 779]

Blower Wheel Size (in) [mm] (2) 5 1/4 x 8 1/8 [133 x 206] (2) 5 1/4 x 8 1/8 [133 x 206]

WSHP-PRC004-EN6

Features and

Benefits

Figure FB-1 – Cabinet Construction

Figure FB-2 – Hook-Secure Fit

Design Advantages

The console configuration model GECA

product offers a range of capacities

1

/2 to

1

/4 ton.

This compact HVAC advantage supports

multiple application requirements in the

commercial conditioning industry. This

includes:

•

Hotel rooms

•

Offices

•

Condominiums

•

Assisted living facilities

•

Dormitories

Cabinet

The cabinet is constructed of heavy

gauge metal for maximum durability.

The cabinet finish is produced by a

corrosion resistant electrostatic powder

paint coating in the following

colors:

•

Deluxe beige

•

Cameo white

•

Soft dove

Building Block Design

The console configuration maintains a

tri-building block design. It includes

•

Cabinetry

•

Chassis

•

Subbase

These building blocks may be ordered in

several configurations. They include:

•

Standard configuration

(cabinet,

chassis, and subbase)

•

Low height configuration

(chassis,

cabinet, and short subbase)

•

Extended length for unit mounted loop

pump kit

(cabinet, chassis, and

subbase)

•

Chassis ONLY

The cabinet design includes a

hook-

secure fit

that allows complete access to

piping and electrical hookup for ease of

maintenance and serviceability. The

single cabinet assembly is securely

fastened into the wallsleeve.

(See Figure

FB-2 for hook-secure fit.)

7

WSHP-PRC004-EN

Features and

Benefits

Field Flexibility

Piping and electrical connections to the

console are made in either the left or

right hand end pocket. The unit

refrigeration platform and the unit

control box is maintained in the same

location whether left or right hand

piping, standard unit cabinetry, extended

unit cabinetry, or low height unit

cabinetry has been specified. This cloned

platform poses a common look and feel

to the installer, as well as aids in

troubleshooting during service or

maintenance checkups.

Differences

Right Hand Piping

Console units ordered with a right hand

piping connection have the end pocket

located on the right hand side of the unit.

This end pocket provides room for

connecting field supply, return, and

condensate piping to the unit. It also

provides space for the high and low

voltage connections.

See Figure FB-3 for

right hand piping.

Left Hand Piping

Console units ordered with a left hand

piping connection have the end pocket

located on the left hand side of the unit.

This end pocket provides room for the

field supply, return, and condensate

piping connection to the unit. Installation

for the high voltage connection is also

made in the left hand end pocket.

Installing the low voltage controls

(thermostat/sensor hookup) is ALWAYS

made on the right hand side of the unit.

The low voltage termination for

thermostat or sensor wires may be run

along the back side of the chassis to the

right hand side of the unit for

connection.

See Figure FB-4 for left hand

piping.

Note:

Units containing the unit mounted

control option will ship from the factory

prewired. No low voltage hookup is

required.

Figure FB-3 – Right Hand Piping

Figure FB-4 – Left Hand Piping

WSHP-PRC004-EN8

Features and

Benefits

Figure FB- 6 – Wall Sleeve

Wall Sleeve

The cabinets wall sleeve is attached to

the wall by (4) four, #10 field provided

screws. This rigid design allows for ease

of separation from the cabinet assembly

during service or installation situations.

The wall sleeve is painted the same color

as the cabinet for aesthetic purposes.

Drain Pan

The unit drain pan is composed of

plastic, corrosive resistive material. The

pan is positively sloped to comply with

ASHRAE 62 for (IAQ) indoor air quality

conformity.

Access to the drain pan is provided

through the front chassis access panel.

The drain pan is removable for cleaning.

Cabinet Insulation

The cabinet insulation design meets UL

181 requirements. The air stream surface

of the insulation is fabricated of a non-

biodegradable source.

The insulation in the wet section of the

cabinet complies with ASHRAE standard

62 to accommodate (IAQ) indoor air

quality standards.

Refrigeration Piping

The unit’s copper tubing is created from

a 99% pure copper formation that

conforms to the American Society of

Testing (ASTM) B743 for seamless, light-

annealed processing.

The unit’s copper refrigeration system is

manufactured to be free from

contaminants and conditions such as

drilling fragments, dirt, or oil. This

reduces the possibility of these

contaminants damaging the compressor

motor.

Schrader Connections

The connections for the low and high

side of the refrigeration system are

located in the chassis portion of the unit

at the front of the refrigeration assembly.

Access to the schrader connections are

made through the refrigeration service

access panel.

Air-to-Refrigerant Coil

The air-to-refrigerant heat exchanger is

constructed of staggered copper tubes

with die-formed corrugated lanced

aluminum fins. The fins are then

mechanically bonded to the tubes

through expansion.

The maximum working pressure of the

coil is 450 psig. It is designed for

maximum capacity with an additional

benefit of physical unit size reduction.

Coil specifications for the GECA unit is

listed below.

Compressor

The unit’s design includes a rotary

compressor motor in dedicated voltages

and tonnage sizes to aid in voltage

variations along with noise reduction of

the unit.

As an added benefit, Trane double

isolates the compressor and the

mounting plate assembly in the unit to

reduce sound vibration during

compressor operation.

Figure FB-7 – Plastic Drain Pan

Figure FB-8 – Rotary Compressor

Figure FB-9 – Schrader Connections

Table FB-1 – Coil Specifications

Unit Size Number of Rows Fins/inch

006 3 14

009 2 14

012 3 14

015 4 14

9

WSHP-PRC004-EN

Features and

Benefits

Coaxial Coil

The unit’s internal heat exchanging

water coil is engineered for maximum

heat transfer.

The copper or cupro-nickel seamless

tubing is a tube within a tube design.

The inner-tube contains a deep fluted

curve to enhance heat transfer and

minimize fouling and scaling. Coaxial

heat exchangers are more tolerant to

freeze rupture.

Compressor and Coaxial Coil Isolation

Vibration isolation for the compressor

and coaxial water coil is accomplished

by increasing the rigidity and stiffness at

the base for the compressor, and at the

back of the chassis for the coaxial water

coil. This platform includes double

isolation to the compressor and single

isolation to the coaxial water coil.

Water Connections

The water-in/water-out connections to

the coaxial water coil are located in the

right-hand or left hand end pocket

(option specific).

The water-in/water-out tubes are a

5

/8-inch [14.7 mm] OD sweat connection.

The connection is available in either a

left hand or right hand piping end

pocket.

Figure FB-10 – Coaxial Water Coil

Figure FB-11 – Water Connection

Expansion Valve

All Trane water-source systems include

an expansion valve flow metering

device.

This thermal expansion valve (TXV)

allows the unit to operate with an

entering fluid temperature from 25 F to

110 F [-3.9 C to 43.3 C], and entering air

temperatures from 40 F to 90 F [4.4 C to

32.2 C]. The valve precisely meters

refrigerant flow through the circuitry to

achieve desired heating or cooling.

Unlike cap-tube assemblies, the

expansion valve device allows the exact

amount of refrigerant required to meet

the coil load demands. This precise

metering by the TXV increases the

efficiency of the unit.

Reversing Valve

A system reversing valve (4-way valve)

is included with all heating/ cooling

units. This valve is piped to be energized

in the cooling mode. Once the valve is

energized for cooling, it will remain

energized until the control system is

turned to the OFF position, or a heating

cycle is initiated.

Units with the cooling only option will

not receive a reversing valve.

Figure FB-12 – Expansion Valve

Figure FB-13 – Reversing Valve

Blower Housing

The blower housing is constructed of

non-corrosive galvanized steel.

Serviceability to the housing is made

through the chassis air-side front panel.

The fan housing is mounted onto a

fanboard assembly which also includes

the fan wheel, and fan motor. This fan

board assembly may be easily removed

from the chassis by sliding the fan board

frontward in maintenance or service

situations.

Figure FB-14 – Fan Board Assembly

WSHP-PRC004-EN10

Features and

Benefits

Figure FB-15 – Blower Motor

Blower Motor

The supply-air (blower) motor is a multi-

speed motor with internal thermal

overload protection. The motor bearings

are permanently lubricated and sealed.

Standard motors are rated from 200

CFM at low speed (unit size 006) to 425

CFM at high speed (unit size 015).

All motors are factory wired for low and

high speed options. Switching for speed

control is located in the unit control

panel.

(See Figure FB-15 for blower

motor and Figure FB-16 for fan switching

control panel.)

See fan performance section for factory

ratings of low and high speed settings.

Air-Side Filter

The air-side filter incorporates a 1-inch

[25.4 mm] thick (nominal) disposable

fiberglass option. The filter includes an

average synthetic dust weight arrestance

of approximately 75%. This dust holding

capability includes a colorless, odorless

adhesive to retain dirt particles within

the filter media after fiber contact.

The filter is accessible through the

return-air portion of the unit subbase.

Panel removal is not necessary to

facilitate filter maintenance for the

standard height unit configuration.

Figure FB-16 – Fan Switch Control Panel

Figure FB-17 – Filter Media

Supply-Air Registers

Supply-air registers for the GECA

product are constructed of a plastic,

corrosive resistive material. The registers

include a snap-in deflection design to

simplify installation, as well as facilitate

the ability to apply a bi-directional

arrangement across the register.

Hinged Control Box

Controls for the console unit are housed

on the right-hand side of the chassis. The

box dwells above the refrigeration

section of the chassis.

Access to the controls are made by way

of a hinged control box. This hinged box

allows easy access for service and

installation of the controls portion of the

chassis.

Figure FB-18 – Bi-directional Registers

Figure FB-19 – Hinged Control Box

11

WSHP-PRC004-EN

Features and

Benefits

Sound Attenuation Package

The console equipment is designed to

achieve the lowest noise levels possible.

Extensive testing has identified the

major sound generating sources within

the console unit package. Every effort

has been made to minimize the sound

generation and transmission from the

compressor, heat exchangers, and fan

sources. Vibration transmission from the

compressor and heat exchangers have

been minimized by the use of isolation.

The use of heavy metal gauges in critical

areas enhance the unit acoustic

performance. A patented two-stage

compressor isolation system has been

specifically designed for the console unit.

Acoustic lining has been used to quiet

compressor noise.

The unit airside acoustic performance

has been engineered to obtain the

quietest acoustic performance through

the fan, and fan housing selection. The

fin tube (air-to-refrigerant) coil and fan

discharge arrangement includes an

additional acoustic lining in the fan

compartment to further reduce the

airside sound levels. (See sound

performance data .)

The sound package for the console unit

includes:

Table FB-2 – Sound Package

Standard Unit

Two stage compressor vibration isolation

Water-to-refrigerant heat exchanger vibration

isolation

12-gauge intermediate mounting plate for the

compressor

Lined compressor inclosure with 1/2-inch [12.7 mm]

cabinet insulation

Heavy gauge base assembly

Maximum sized return-air opening and filter sizing

See Figure FB-20 for console noise

control.

Figure FB-20 – Console Noise Control

WSHP-PRC004-EN12

Features and

Benefits

Adjustable

Temperature

Setting

(Factory set

to 55 F

[12.8 C])

Power

Connection

Water

Sensor

Figure FB-21 – Boilerless Controller

Boilerless Control and Electric Heat

(option)

The boilerless electric heat option is

composed of a nichrome open wire

heating element with an internal

temperature limit placed above the fan

housing and an electronic (boilerless)

controller located in the main control

box.

See Figure FB-21 for boilerless

controller.

The boilerless control option is

comprised of a single stage of electric

heat and is designed to invoice electric

heat in the event that entering-water

temperatures falls below 55 F [12.8 C].

On a call for heating, the electric heater is

energized, locking out the compressor.

Once the entering water temperature

rises, above 60 F [15.6 C], the boilerless

controller returns the unit to normal

compressor heating operation and locks

out the electric heater. This option is

ONLY available on heat pump units.

See

Figure FB-22 for boilerless control

electric heat schematic.

Table FB-3 – Heating Elements

Unit Size Voltage No. of Elements kW Heat Total Amps Digit 22

006-015 220-240 2 3.00 10.83 2 (Minimum)

4.00 14.44 3 (Maximum)

Figure FB-22 – Boilerless Control Electric Heat Schematic

Cooling Only Units with Electric Heat

(option)

Electric heat on a cooling only system

incorporates the same nichrome open

wire coil design as mentioned in the heat

pump version. Although, for units that

utilize a cooling ONLY-electric heat

design, the thermostat is wired directly

to the primary electric heat contactor for

heating, and the compressor contactor

for cooling. See Figure FB-23 for cooling

only with electric heat diagram and

Table FB-3 for heating element size and

quantity.

Figure FB-23 – Cooling Only With Electric Heat Schematic

13

WSHP-PRC004-EN

Features and

Benefits

Hot Gas Reheat (option)

For true atmospheric conditioning and

climate control, Trane provides accurate,

cost effective dehumidification control

through a hot gas reheat option. This

option is designed to accommodate the

size 009 console configuration.

With this reheat option, the return air

from the space is cooled by the air-to-

refrigerant coil, then reheated by the

reheat coil to control not only space

temperature, but to also reduce the

relative humidity of the space. The

amount of moisture removal of a specific

heat pump is determined by the unit’s

latent capacity rating.

When operating in the reheat mode, the

humidistat signals the reheat relay coil to

energize, allowing the high pressure

refrigerant gas to flow from the

compressor, through the reversing valve,

into the reheat valve, for passage

through the reheat coil.

See Figure FB-24

for the reheat conditioning schematic.

Figures FB-25 and FB-26 show the basic

heating and cooling cycle of the console

piped with the reheat option.

Common reheat applications include:

•

Conditioned-air delivered directly to

the space

•

Auditoriums, theaters, classrooms or

where a large latent load exist

•

Computer room space conditioning

•

Anywhere humidity control is a

problem

Figure FB-25 – Cooling Mode for Console Unit Piped With Hot Gas Reheat Option

Figure FB-26 – Heating Mode for Console Unit Piped With Hot Gas Reheat Option

Figure FB-24 – Reheat Conditioning Schematic

WSHP-PRC004-EN14

Basic 24V

Controls

Features and

Benefits

Basic 24V Electronic Controls

The basic 24V electro-mechanical unit

control provides component protection

devices for maximum system reliability.

Each device, is factory mounted, wired,

and tested in the unit. The control

package includes:

See Figure FB-27 for

the console basic 24V control box.

•

50 VA transformer

•

Compressor contactor

•

Compressor run capacitor

•

General alarm

(24 volt when a fault is

detected)

•

Low pressure switch

•

High pressure switch

•

Lockout relay

•

Reversing valve coil

(for heating and

cooling units only)

•

Two-speed fan motor

(unit mounted

fan speed switch)

•

18-pole terminal strip

(for low voltage

field wiring)

•

Optional: Condensate overflow

•

Optional: Unit mounted controls

•

Optional: Motorized two-position

damper

Figure FB-27 – Console Basic 24V Control Box

15

WSHP-PRC004-EN

Features and

Benefits

Basic 24V

Controls

Figure FB-28 – Low and High Pressure

Switches

Stand-alone System

The 24V electro-mechanical design may

be applied as a stand-alone control

system. The stand-alone design provides

accurate temperature control directly

through a unit mounted controller, or a

wall-mounted mercury bulb or electronic

thermostat. This system setup may be

utilized in a replacement design where a

single unit retrofit is needed. It may be

easily interfaced with a field provided

control system by way of the factory

installed 18-pole terminal strip.

This stand-alone control is frequently

utilized on lower volume jobs where a

building controller may not be

necessary, or where field installed direct

digital controls are specified. This type of

control design does require a constant

flow of water to the water source heat

pump. With a positive way to sense flow

to the unit, the units safety devices will

trigger the unit off.

The stand-alone system design provides

a low cost option of installation while still

allowing room control freedom for each

unit.

See Figure FB-29 for 24V stand-

alone system controls.

Safety Devices

All unit safety devices are provided to

prevent compressor damage.

Low Pressure Switch

The low pressure switch prevents

compressor operation under low charge,

excessive loss of charge situations, and

under low temperature operation. This

device is installed on the suction side of

the refrigeration circuit. It is set to

activate at refrigerant pressures of 20

psig to fit most applications.

High Pressure Switch

The high pressure switch prevents

compressor operation during high or

excessive discharge pressures. This

device is located on the discharge side of

the compressor. The pressure switch de-

energizes the compressor when

discharge pressure exceeds 395 psig.

See Figure FB-28 for pressure switches.

Lockout Relay

The lockout relay works with the low and

high pressure switch to prevent

compressor operation if the unit is under

low or high refrigerant circuit pressure,

or condensate overflow conditions. The

lockout relay may be reset at the

thermostat, or by cycling power to the

unit.

General alarm is accomplished through

the lockout relay and is used for driving

light emitting diodes (LEDs). This feature

may be used to drive field supplied

relays, but cannot be used to drive field

installed control inputs.

Figure FB-29 – 24V Stand-alone System Controls

WSHP-PRC004-EN16

Deluxe 24V

Controls

Features and

Benefits

Deluxe 24V Electronic Controls

The deluxe 24V electronic unit control

provides component protection devices

similar to the basic design, but contains

upgraded features to maximize system

performance to extend the system life.

Each device, is factory mounted, wired,

and tested in the unit. The deluxe micro-

processor based package includes:

See

Figure FB-30 for the console deluxe 24V

control box.

Additions to basic 24 volt control:

•

75 VA transformer

•

General alarm

(dry contact closure

when fault detected)

•

LED Diagnostics

•

Anti-short cycle compressor protection

•

Random start delay

•

Brown-out protection

•

Low pressure time delay

•

Compressor delay on start

•

Reversing valve coil

(for heating and

cooling units only)

•

Optional: Condensate overflow

•

Optional: Night setback

•

Optional: Hot gas reheat

(for dehumidification)

•

Optional: Electric heat

•

Optional: Compressor disable input

•

Optional: Unit mounted controls

•

Optional: Motorized two-position

damper

Figure FB-30 – Console Deluxe 24V Control Box

Figure FB-31 – Deluxe 24V Control Board

Microprocessor Design

The 24 volt deluxe design is a

microprocessor-based control board

conveniently located in the control box.

The board is unique to Trane water-

source products and is designed to

control the compressor as well as

provide outputs for unit status and fault

detection.

The Trane microprocessor board is

factory wired to a terminal strip to

provide all necessary terminals for field

connections.

See Figure FB-31 for the

deluxe 24V control board.

17

WSHP-PRC004-EN

Features and

Benefits

Deluxe 24V

Controls

Deluxe 24V features

include:

Random Start

The random start relay provides a time

delay start-up of the compressor when

cycling to the occupied mode. A new

start delay time between 3 and 10

seconds is applied each time power is

enabled to the unit.

Anti-short Cycle Timer

The anti-short cycle timer provides a

three minute time delay between

compressor stop and compressor

restart.

Brown-out Protection

The brown-out protection function

measures the input voltage to the

controller and halts the compressor

operation. Once a brown-out situation

has occurred, the anti-short cycle timer

will become energized. The general fault

contact will not be affected by this

condition. The voltage will continue to

be monitored until the voltage increases.

The compressor will be enabled at this

time if all start-up time delays have

expired, and all safeties have been

satisfied.

Compressor Disable

The compressor disable relay provides a

temporary disable in compressor

operation. The signal would be provided

from a water loop controller in the

system. It would disable the compressor

because of low water flow, peak limiting

or if the unit goes into an unoccupied

state. Once the compressor has been

disabled, the anti-short cycle time period

will begin. Once the compressor disable

signal is no longer present, and all

safeties are satisfied, the control will

allow the compressor to restart.

Generic Relay

The generic relay is provided for field

use. Night setback or pump restart are

two options that may be wired to the

available relay.

(Note: Night setback is

available as factory wired.)

An external

Class II 24VAC signal will energize the

relay coil on terminals R1 and R2.

Terminals C (common), NO (normally

open), and NC (normally closed) will be

provided for the relay contacts.

Safety Control

The deluxe microprocessor receives

separate input signals from the

refrigerant high pressure switch, low

suction pressure switch and condensate

overflow.

In a high pressure situation, the

compressor contactor is de-energized,

which suspends compressor operation.

The control will go into

soft lockout

mode initializing a three minute time

delay and a random start of 3 to 10

second time delays. Once these delays

have expired, the unit will be allowed to

run. If a high pressure situation occurs

within one hour of the first situation, the

control will be placed into a

manual

lockout

mode, halting compressor

operation, and initiating the general

alarm.

In a low temperature situation, the low

pressure switch will open after the

compressor starts. If the switch is open

for 45 seconds during compressor start,

the unit will go into

soft lockout

mode

initializing a three minute time delay and

a random start of 3 to 10 second time

delays. Once these delays have expired,

the unit will be allowed to run. If the low

pressure situation occurs again, and the

device is open for more than 45 seconds,

the control will be placed into a

manual

lockout

mode, halting compressor

operation, and initiating the general

alarm.

In a condensate overflow situation, the

control will go into

manual lockout

mode, halting compressor operation,

and initiating the general alarm.

The general alarm is initiated when the

controller goes into a

manual lockout

mode for either high pressure, low

pressure or condensate overflow

conditions. The alarm can be reset at the

thermostat or by cycling power to the

unit.

WSHP-PRC004-EN18

Deluxe 24V

Controls

Features and

Benefits

Microprocessor Board

The application drawing in Figure FB-32

references component device

connections to the microprocessor

board.

Three LED’s (light emitting diodes) are

provided for indicating the operating

mode of the controller. The LED’s are

intended

to aid in troubleshooting and unit

maintenance. The LED’s are labeled on

the circuit board with numbers as

referenced in Table FB-4.

Table FB-4 – Diagnostic LED’s

Color: Green Color: Red

LED1 LED2 LED3 Controller Mode

OFF OFF OFF Control OFF

ON OFF OFF Normal/Compressor OFF

ON OFF FLASH Anti-short cycle

ON OFF ON Normal/Compressor ON

FLASH ON OFF Brownout Condition

ON FLASH ON Soft Lockout (low pressure)

ON FLASH FLASH Soft Lockout (high pressure)

ON ON ON Manual Lockout (low pressure)

ON ON FLASH Manual Lockout (high pressure)

ON FLASH OFF Manual Lockout (condensate overflow)

ON ON OFF Compressor Disable

Figure FB-32 – Microprocessor Board

Unit Mounted Controls

Unit mounted controls are available with

both the basic 24 volt electronic control

package and the deluxe 24 volt

electronic control package. With the unit

mounted option, the low voltage wiring

for the unit is factory made.

Controls for the unit mounted package

include a cooler/warmer temperature

control dial, START/STOP manual power

switch, manual changeover from HEAT

to COOL, and fan speed control. See

Figure FB-33 for unit mounted 24 volt

controls.

Figure FB-33 – Unit Mounted 24 Volt Controls

19

WSHP-PRC004-EN

Features and

Benefits

Deluxe 24V

Controls

Small Building Control

The deluxe 24V electro-mechanical

design may be applied as a stand-alone

control system or as a multi-unit

installation system. With a stand-alone

design, units run independently of one

another with a mercury bulb or

electronic digital thermostat.

With a multiple unit installation, the units

may be daisy-chained directly to the

Trane Tracer loop controller (TLC),

pump(s), boiler, and tower for a

complete networked water-source

system. The TLC provides a night

setback output, and a pump request

input for system optimization.

See Figure FB-34 for 24 volt deluxe

control system.

Figure FB-34 – 24 Volt Deluxe Control System

WSHP-PRC004-EN20

Tracer ZN.510

Controls

Features and

Benefits

Tracer ZN.510 Controls

Tracer ZN.510 is a direct digital control

(DDC) system, specifically designed for

water-source units to provide control of

the entire unit, as well as outputs for unit

status and fault detection. Each device, is

factory installed and commissioned to

ensure the highest level of quality in unit

design. The Tracer ZN.510 control

package includes:

See Figure FB-35 for

the console Tracer ZN.510 control box.

Additions to 24V Deluxe Controller:

•

75 VA transformer

•

Heating/cooling status

•

Occupied/unoccupied mode

•

Fan and filter status

•

Reversing valve coil (

for heating and

cooling units only)

•

Two-speed fan motor (

unit mounted

fan speed switch)

•

18-pole terminal strip

(for low voltage

hook-up)

•

Optional: Condensate overflow

•

Optional: Motorized 2-position damper

Direct Digital Controls

In addition to being factory configured to

control the unit fan, compressor, and

reversing valve of the unit, the Tracer

ZN.510 controller is designed to

coordinate the water side of the water-

source system. If applied in a

peer-to-peer communication

environment, data between similar

controllers may be exchanged without

requiring a building automation system.

See Figure FB-36 for the Tracer ZN.510

board.

Figure FB-35 – Vertical Tracer ZN.510 Control Box

Figure FB-36 – Tracer ZN.510 Board

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