Commercial 12.5 to 50 Ton 60 Hz Commercial 22.9 to 41.7 Ton 50 Hz CV or VAV Rooftop Air Conditioners with ReliaTel™ Controls
Model Number
"Y" and later Design Sequence
TC*, TE*, YC*330A, 360A, 420A, 480A, 600A (60 Hz/3 phase)
TC*, TE*, YC*275A, 305A, 350A, 400A, 500A (50 Hz/3 phase)
This booklet describes the proper installation, start-up, operation, and maintenance procedures
for TC_, TE_, and YC_27.5 to 50 Ton CV (Constant Volume) and VAV (Variable Air Volume)
applications. Refer to the table of contents for a listing specific topics. Refer to the "System
Troubleshooting" section at the end of this manual for troubleshooting information.
By carefully reviewing the information within this manual and following the instructions, the risk
of improper operation and/or component damage will be minimized.
It is important that periodic maintenance be performed to help assure trouble free operation. A
maintenance schedule is provided at the end of this manual. Should equipment failure occur,
contact a qualified service organization with qualified, experienced HVAC technicians to properly
diagnose and repair this equipment.
Table of Contents
Literature Change History
Overview of Manual
Model Number Description
60 Hz Description
50 Hz Description
General Information
Commonly Used Acronyms/Abbreviations
About the Unit
Precautionary Measures
First Aid Measures
Unit Inspection
Storage
Pre-Installation
General Unit Requirements
Downflow Models Only:
All Units:.
Electrical Requirements
Field Installed Control Wiring
Gas Heat Requirements
Unit Dimensions and Weights
Recommended Clearances
Roof Curb and Ductwork
Horizontal Ductwork
Unit Rigging and Placement.
Installation General Requirements
Condensate Drain Connection
O/A Sensor & Tubing Installation
Installation Electrical
Disconnect Switch External Handle
Factory Mounted Option)
Main Power Wiring
Thru-the-Base Electrical
(Optional Accessory)
Electrical Wire Sizing and Protection Device Equations
Low Voltage Wiring
Control Power Transformer
Field Installed AC Control Wiring
Field Installed DC Control Wiring
Remote Panels and Sensors
Constant Volume Control Options
Variable Air Volume Control Options
Installation Piping
Connecting the Gas Supply Line to the Furnace Gas Train
Start-Up
Unit Control Modules
System Operation
Microelectronic Control Features
Variable Air Volume Applications
Constant Volume or Variable Air Volume Applications
Preparing the Unit for Operation
Electrical Phasing
Voltage Supply and Voltage Imbalance
Starting the Unit
Test Modes
Verifying Proper Fan Rotation
Verifying Proper Air Flow (CFM)
Exhaust Fan Operation
Economizer Damper Adjustment
Economizer (O/A) Dampers
Manual Fresh Air Damper
Starting the Compressor
Starting 27.5 - 35 Ton units
Starting 40 to 50 Ton units
Compressor Oil
Scroll Compressor Operational Noises
At Low Ambient Start-Up
During Normal Operation
Compressor Crankcase Heaters
Charging by Subcooling
Measuring Subcooling
Gas Heat Units
Electric Heat Units
Final Unit Checkout
For Constant Volume Units;
For Variable Air Volume Units;
Sequence of Operation
Mechanical Cooling Sequence Of Operation
Units without an Economizer
Economizer operation based on Dry Bulb
Economizer operation based on Reference Enthalpy
Economizer Operation based on Comparative Enthalpy
Gas Heat Sequence Of Operation
Electric Heat Sequence Of Operation
Maintenance
Fan Belt Adjustment
Monthly Maintenance
Filters
Cooling Season
Heating Season
Coil Cleaning
Refrigerant Coils
Diagnostics
System Status/Diagnostics
Terminal locations
Diagnostics (CV units only)
Diagnostics (VAV only)
Resetting Cooling and Ignition Lockouts
Zone Temperature Sensor (ZSM) Service Indicator
RTRM Zone Sensor Module (ZSM) Test
Test 1
Test 2
Test 3
Test 4
Programmable & Digital Zone Sensor Test
Rooftop Refrigerator Module (RTRM)
Test 1
Test 2
ReliaTel Air Module (RTAM) Test
Test 1
Test 2
Test 3
Test 5
VFD Programming Parameters
Unit Wiring Diagram Numbers
Warranty and Liability Clause
COMMERCIAL EQUIPMENT RATED 20 TONS AND LARGER AND RELATED ACCESSORIES
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