American Standard YCD121 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 YCD121 Specifications

General

Brand	American Standard
Model	YCD121
Category	Heat Pump
Language	English

Summary

Inspection

Unit Features

Self-test/Auto-configuration

System performs automatic tests to verify correct operation and configure itself upon power-up.

Cooling Minimum ON/OFF times

Enforces a minimum 3-minute ON/OFF time for compressor reliability to prevent short cycling.

Test Mode Procedures

Step Test Mode

Initiated by shorting test terminals, cycles through unit operational steps for diagnostics.

Auto Test Mode

Unit cycles through test steps automatically once upon jumper installation, each step lasting 30 seconds.

Resistance Test Mode

Initiated by applying resistance across test terminals, allowing selection of specific test steps for diagnostics.

Dimensional Data

Unit Dimensions

Provides detailed measurements of unit dimensions and critical points for installation planning.

Location and Recommendations

Location and Clearances

Specifies requirements for unit placement, airflow, and service access to ensure optimal performance.

Placing and Rigging

Instructions for safely lifting and positioning the unit using appropriate rigging techniques.

Attaching Downflow Ductwork to Roof Curb

Gas Piping Installation

Evaporator Fan Adjustment

Power Wiring

Start-Up

Pre-Start Quick Check List

A comprehensive checklist to verify all installation and safety requirements are met before initial operation.

Power-up Initialization

Starting the Unit in the Heating Mode

Starting The Unit In The Cooling Mode

Compressor Overload Protection

Final Installation Checklist