© 2003 American Standard Inc. All rights reserved.
Installation
RTHC
Condenser Water Regulating Valve Option
Order Number:
RTHC-SVN02C-EN
Date: June 2003
Pueblo Built Units Only
Introduction
To satisfy system oil protection safeties and to maximize energy efficiency, adequate
condenser water control on the RTHC units is necessary. The required system
differential (condensing pressure minus evaporator pressure) is 25 psid for all RTHC
units. This differential must be maintained at all load conditions and must be achieved,
following a start-up, within 2 minutes.
On start-up, the system differential must be at least 8 psid within 20 seconds, which
generally equates to the condenser leaving water temperature being equal to or
greater than the evaporator leaving water temperature. The system also must achieve
a leaving condenser water temperature 25 F higher than the evaporator leaving water
temperature within 2 minutes from start-up and maintain thereafter.
To maintain proper oil flow to the compressor, strict condensing water control is
necessary. One method of achieving this control is through the installation of an
optional water regulating valve.
NOTICE:
Warnings and Cautions appear at appropriate sections
throughout this literature. Read these carefully.
WARNING:
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION:
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It may also be used to
alert against unsafe practices.
CAUTION:
Indicates a situation that may result in equipment or property-
damage only accidents.
