Introduction; General; Product Description; Capabilities And Features - Trane TR-OHS RCU Series Installation, Operation And Maintenance Manual

Introduction

General

Trane manufactures two versions of the Remote
Condensing Unit (RCU): one for outdoor installation (RCU-
O) and one for indoor installation (RCU-I). This manual
documents both types of RCU for Trane. Recognized as a
world leader, Trane provides precision cooling systems
with the highest quality craftsmanship using the finest
materials available in the industry. The unit will provide
years of trouble-free service if installed and maintained in
accordance with this manual. Damage to the unit from
improper installation, operation or maintenance is not
covered by the warranty.
This manual contains information for installation,
operation, maintenance, troubleshooting and repair.
Spare parts are available from Trane to insure continuous
operation. Using substitute parts or bypassing electrical or
refrigeration components in order to continue operation is
not recommended and will void the warranty. Due to
technological advancements, components are subject to
change without notice.
RCU systems are designed to reject heat from refrigerant
based cooling equipment. Any use beyond this is deemed
to be not intended. Trane is not liable for any damage
resulting from improper use. The RCU-O system is
designed to be installed outdoors unless otherwise noted
on the equipment nameplate. The RCU-I is designed for
indoor installation only.

Product Description

RCUs are air-cooled, heat rejection condensing systems
with horizontal air discharge. The units are contained in a
light weight, corrosion resistant aluminum cabinet
designed for mounting to a horizontal surface (RCU-O) or
suspension from a ceiling (RCU-I). The cabinet houses the
compressor, condensing unit coil, fan assembly, sight
glass and receiver (optional). The electrical controls in the
RCU-O and RCU-I are in an integrally mounted electric box
enclosure which is isolated from the rest of the equipment.
The electric box on the RCU-O is weatherproof. There are
several cabinet sizes based on the capacity of the unit.
Refer to the installation drawing supplied with the unit for
the layout and dimensions of the cabinet.
The cooling capacity in Btu/h will depend on the unit size
which can range from 12,000 to 120,000 Btu/h. The
condensing system is a closed-loop circuit in which
refrigerant is continuously circulated by a pressure
differential created by the compressor. The compressor is
designed to increase refrigerant pressure to a level
sufficiently high for it to be cooled and condensed into
liquid by the effect of ambient air being drawn over the
condensing unit coil.
Both RCUs use fan cycling for low ambient head pressure
control down to 0 °F. Flooded head pressure control is
used for low ambient temperatures down to -30°F.
6
RCU systems are designed to operate with either R407C
refrigerant. Refer to the unit nameplate to identify the
model number and which refrigerant is used with the unit.
Note: RCU systems are strictly for non-residential
applications.
Operation of the RCU is controlled by a 24 Vac input signal
from a system controller provided with the refrigeration
equipment.

Capabilities and Features

• All Aluminum Cabinet Construction.
• Aluminum Fin Copper Tube Coil Construction.
• Vibration Isolation of Compressor.
• Fan Motor Equipped with Permanently Lubricated
Motor Bearings.
• Removable Lid Allows Access to All Components
(RCU-O only).
• Compact Profile with Internal Control Enclosure.
Application Ranges
RCU systems are designed for operation within the
following ranges:
Outdoor Temperature Range:
Fixed Fan Cycling Control........................ 0 to 95°F.
Flooded Head Pressure Control.............. -30 to 95°F.
Operating Voltage:
Vac Input per unit nameplate +/- 10%.
Max. Piping Length; Evaporator to RCU:
100 ft equivalent length.
(50 equivalent ft if equipped with hot gas bypass.)
Max. Vertical Level Drop; Refrigeration Equipment to RCU:
15 ft (when RCU is below the evaporator).
Storage Conditions:............................... -30 to 105°F.
Note: Damage or malfunction to the unit due to storage
or operation outside of these ranges will void the
warranty.
SS-SVX004C-EN