American Standard YCD181 User Manual

1
YC-IOM-4G
18-EB60D11-7
Library Service Literature
Product Section Unitary
Product Rooftop Lt. Comm.
Model YC
Literature Type Installation/ Oper/ Maint
Sequence 4G
Date August 1998
File No. SV-UN-RT-YC-IOM-4G 8/98
Supersedes YC-IOM-4F
Since the manufacturer has a policy of continuous product improvement, it reserves the right to
change specifications and design without notice. The installation and servicing of the
equipment referred to in this booklet should be done by qualified, experienced technicians.
© American Standard Inc. 1998
Packaged Gas/Electric
8-1/2 thru 25 Ton
INSTALLATION
OPERATION
MAINTENANCE
Customer Property — Contains wiring, service,
and operation information. Please retain.
Models: (60 Hz) (50 Hz)
YC*102-301 YC*085-250
IMPORTANT NOTE: All phases of this installation must comply with the NATIONAL, STATE & LOCAL CODES. In
addition to local codes, the installation must conform with National Electric Code -ANSI/NFPA NO. 70 LATEST REVISION.
These units are equipped with an electronic unit control processor, (UCP) that provides service functions which are
significantly different from conventional units. Refer to the TEST MODES and START-UP PROCEDURES before
attempting to operate or perform maintenance on this unit.

American Standard YCD181 Specifications

General

Brand	American Standard
Model	YCD181
Category	Heat Pump
Language	English

Summary

Perform Unit Inspection

System Components and Modes

Smoke Detector and Test Procedures

Return Air Smoke Detector

Test Mode Operation

Explains how to operate the unit using the test mode for diagnostics.

Test Mode Operations

Step Test Mode

Describes initiating and advancing through test steps via shorting terminals.

Auto Test Mode

Explains automatic cycling through test steps using a jumper.

Resistance Test Mode

Details initiating test steps by applying specific resistance values.

Installation Location and Support

Location and Recommendations

Ductwork Installation Guidelines

Piping and Gas Installation

Condensate Drain Piping

Gas Piping Installation Standards

Covers installation standards, warnings, and codes for gas piping.

Gas Supply and Fan Adjustment

Gas Supply Line Pressures

Guidelines for gas pressure, regulators, and leak testing for safe operation.

Manifold Pressure Check

How to check and adjust unit gas valve manifold pressure.

Evaporator Fan Adjustment

Procedure for adjusting fan sheaves for proper airflow and RPM.

Electrical and Control Wiring

Power Wiring Guidelines

Low Voltage Control Wiring

Zone Sensor Wiring Details

Zone Temperature Sensor Terminals

Pre-Start Procedures and Safety

Electrical Phase Sequence Check

Procedure to check and correct compressor motor electrical phasing.

Pre-Start Quick Check List

Comprehensive checklist for unit installation and pre-operation verification.

Unit Initialization and Heating Start-Up

Power-up Initialization Process

Heating Mode Start-Up

Steps to start the unit for heating operation, including gas purge and settings.

Cooling Operation and Protection

Cooling Mode Start-Up

Procedure to start the unit in cooling mode and bypass time delays.

Operating Pressures Monitoring

Cooling Shut Down Procedure

Compressor Overload Protection Reset

Final Installation and Maintenance

Final Installation Checklist

Checklist for completing all installation requirements before operation.

Season Maintenance - Heating

Season Maintenance - Cooling