Trane WC*150B***G Series User Manual

WC-IOM-7 • Packaged Heat Pump 53
Troubleshooting
Te s t 3
System Mode and Fan Selection
The combined resistance of the Mode selection switch and the Fan selection
switch can be measured between terminals 2 and 4 on the Zone Sensor. The
possible switch combinations are listed on the following page with their
corresponding resistance values.
Te s t 4
LED Indicator Test, (SYS ON, HEAT, COOL & SERVICE)
Method 1
Testing the LED using a meter with diode test function. Test both forward and
reverse bias. Forward bias should measure a voltage drop of 1.5 to 2.5 volts,
depending on your meter. Reverse bias will show an Over Load, or open circuit
indication if LED is functional.
Method 2
Testing the LED with an analog Ohmmeter. Connect Ohmmeter across LED in one
direction, then reverse the leads for the opposite direction. The LED should have
at least 100 times more resistance in reverse direction, as compared with the
forward direction. If high resistance in both directions, LED is open. If low in both
directions, LED is shorted.
Method 3
To test LED’s with ZSM connected to unit, test voltages at LED terminals on ZSM.
A measurement of 32 VDC, across an unlit LED, means the LED has failed.
Note: Measurements should be made from LED common (ZSM terminal 6 to
respective LED terminal). Refer to the Zone Sensor Module (ZSM) Terminal
Identification table at the beginning of this section.
Programmable & Digital Zone Sensor Test
Testing serial communication voltage
1. Verify 24 VAC is present between terminals J6-14 & J6-11.
2. Disconnect wires from J6-11 and J6-12. Measure the voltage between J6-11
and J6-12, should be about 32 VDC.
3. Reconnect wires to terminals J6-11 and J6-12. Measure voltage again
between J6-11 and J6-12, voltage should flash high and low every 0.5
seconds. The voltage on the low end will measure about 19 VDC, while the
voltage on the high end will measure from approximately 24 to 38 VDC.

Trane WC*150B***G Series Specifications

General

Brand	Trane
Model	WC*150B***G Series
Category	Heat Pump
Language	English

Summary

Model Number Description

Product Type and Airflow Configuration

Defines product types (WC, WF) and airflow configurations (D, H).

Cooling Capacity and Development Sequence

Details nominal cooling capacity (MBH) and major development sequence.

Electrical Characteristics and Factory Options

Specifies electrical characteristics (voltage) and factory-installed options.

Design and Service Digits

Explains minor design sequence and service digits.

General Information

Unit Identification: Nameplates and Description

Information on unit nameplates, compressor nameplates, and unit description.

Control Systems: ReliaTel, RTCI, RLCI, RTOM

Overview of various control modules and interfaces like ReliaTel.

System Input Devices and Functions

Details on input devices like fan failure and clogged filter switches.

Pressure Controls and Power Exhaust

Explanation of low/high pressure controls and power exhaust operation.

Zone Sensors and Temperature Averaging

Description of various zone sensors and temperature averaging methods.

Specialized Sensors: High Temp & Frost Control

Information on high temperature and frost control sensors.

Smoke Detectors and Unit Inspection

Details on smoke detectors and initial unit inspection upon arrival.

Storage and Unit Clearances

Guidelines for unit storage and required operating/service clearances.

Unit Dimensions

Installation Clearances for Units

Visual representation of installation clearances for single/multiple units.

Dimensional Data for 12.5/15 Ton Units

Detailed dimensions, including electrical connections, for 12.5 and 15 ton units.

Dimensional Data for 20 Ton Units

Detailed dimensions, including electrical connections, for 20 ton units.

Horizontal Duct Dimensional Data

Dimensions related to horizontal duct connections and drain.

Rigging and Weight Information

Safety warnings and data for rigging and unit weights.

Installation

Foundation and Ductwork Requirements

Guidelines for unit foundation, footings, and ductwork connection.

General Installation Requirements

Checklist for commercial unit installation including shipping and site verification.

Electrical and Wiring Requirements

Main electrical, electric heat, and low voltage wiring needs.

Condensate Drain and Filter Installation

Procedures for condensate drain trap and filter installation.

Power and Control Wiring Procedures

Details on main unit power wiring and optional base electrical options.

Smoke Detector and Temperature Sensor Wiring

Wiring instructions for smoke detectors and temperature sensors.

Optional Control Wiring Diagrams

Field wiring diagrams for optional controls like zone sensors.

Space Temperature Averaging

Methods for space temperature averaging using remote sensors.

Voltage Imbalance and Electrical Phasing

Procedures for addressing voltage imbalance and electrical phasing.

Crankcase Heaters and ReliaTel Controls

Information on crankcase heaters and ReliaTel control initialization.

Pre-Start

Test Modes for Component Operation

Overview of different test modes (Step, Resistance, Auto) for unit components.

Verifying Proper Air Flow

Procedures to verify and adjust indoor fan airflow using the service test.

Return Air Smoke Detector Functionality

Ensuring proper function of the return air smoke detector with airflow requirements.

Start Up

Economizer and Compressor Start-Up

Step-by-step start-up procedures for economizer and compressors.

Scroll Compressor Checks

Verifying scroll compressor rotation, phasing, and oil levels.

Heating System Start-Up

Procedures for starting up the heating stages.

Final System Setup and Checks

Final checks and programming before leaving the unit after startup.

Maintenance

Fan Belt Adjustment and Tensioning

Procedures for adjusting and maintaining fan belt tension using a gauge.

Monthly Maintenance Checks

Routine monthly maintenance tasks including checks of various components.

Filter and Smoke Detector Maintenance

Procedures for filter inspection and smoke detector maintenance.

Cooling and Heating Season Maintenance

Maintenance tasks specific to cooling and heating seasons.

Coil Cleaning Procedures

Detailed steps for cleaning evaporator and condenser coils.

Troubleshooting

ReliaTel Control Diagnostics

Using RTRM for unit diagnostics and system status information.

Hazardous Service Procedures Warning

Critical safety warnings for electrical and mechanical troubleshooting.

System Status Checkout and Failure Indicators

Checking system status via LEDs and identifying failure causes.

Troubleshooting Specific Failures

Steps for diagnosing cooling, service, and simultaneous failures.

Resetting Lockouts and Sensor Tests

Procedures for resetting lockouts and testing zone sensors.

Zone Temperature Sensor (ZTS) and Set Point Tests

Testing ZTS thermistors and set point potentiometers.

LED Indicator and Mode/Fan Selection Tests

Testing LED indicators and mode/fan selection switches.

Economizer Control (ECA) LED Status

Interpreting ECA LED indicators for troubleshooting economizer issues.

Wiring Diagrams

Overview of Available Wiring Diagrams

List of wiring diagrams for various unit components and controls.

Warranty

Heat Pump Warranty (Less Than 20 Tons)

Warranty terms for specific heat pump models (less than 20 tons).

Commercial Use Warranty Terms

Warranty terms and liability for commercial equipment use.