General Information; Overview Of Manual; Model Number Description - Trane RRU120 D B Series Installation, Operation And Maintenance Manual

General Information

WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power cannot be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.

Overview of Manual

Note: One copy of this document ships inside the control
panel of each unit and is customer property. It must
be retained by the unit's maintenance personnel.
This booklet describes proper installation, operation, and
maintenance procedures for air cooled systems. 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.

Model Number Description

All products are identified by a multiple character model
number that precisely identifies a particular type of unit.
An explanation of the alphanumeric identification code is
provided below. Its use will enable the owner/operator,
installing contractors, and service engineers to define the
operation, specific components, and other options for any
specific unit.
When ordering replacement parts or requesting service,
be sure to refer to the specific model number and serial
number printed on the unit nameplate.
Unit Nameplate
A Mylar unit nameplate is located on the unit's corner
support next to the control box. It includes the unit model
RRU-SVX01F-EN
number, serial number, electrical characteristics,
refrigerant charge, as well as other pertinent unit data.
Compressor Nameplate
The nameplate for the compressors are located on the side
of the compressor.
Unit Description
Before shipment, each unit is leak tested, dehydrated,
charged with refrigerant and compressor oil, and run
tested for proper control operation.
The condenser coils are aluminum fin, mechanically
bonded to copper tubing.
Direct-drive, vertical discharge condenser fans are
provided with built-in thermal overload protection.
The Rooftop Unit Main Control Module (RRUCM) and
ReliaTel™ Control Module (RTRM) are microelectronic
control systems. The acronyms RRUCM and RTRM are
used extensively throughout this document when
referring to the control system network.
The RRUCM is mounted in the Direct Fired Burner Control
Panel and the RTRM is mounted in the Main Control Panel.
The RRUCM and RTRM receive information from sensors
and customer binary contacts to satisfy the applicable
request for ventilation, cooling, dehumidification and
heating.
Supply Fan Failure Input
The fan failure switch (FFS) is connected to verify indoor
fan operation.
If air flow through the unit is not proven by the differential
pressure switch connect to the RRUCM within 90 seconds
nominally, the RRUCM will shut off all mechanical
operations, lock the system out and send a diagnostic
alarm to the Remote Operator Display (ROD). The system
will remain locked out until a reset is initiated either
manually or through the RRUCM via the Alarm Reset
function on the ROD.
Compressor Disable (CPR1/2)
This input incorporates the low pressure control (LPC) of
each refrigeration circuit and can be activated by opening
a field supplied contact installed on the LTB.
If this circuit is open before the compressor is started, the
compressor will not be allowed to operate. Anytime this
circuit is opened for one continuous second during
compressor operation, the compressor for that circuit is
immediately turned "Off". The compressor will not be
allowed to restart for a minimum of three minutes should
the contacts close.
If four consecutive open conditions occur during the first
three minutes of operation, the compressor for that circuit
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