Trane GECA Owner's manual

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 A012 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 1/2to
11/4ton.
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