OAU-SVX004D-EN
13
General Information
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 (see Model Number chapter). 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
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 Outdoor Air Unit Main Unit Display and ReliaTel™
Control Module (RTRM) are microelectronic control
systems. The acronym RTRM is extensively throughout
this document when referring to the control system
network.
The Main Unit Display and the RTRM are mounted in the
Main Control Panel. The Main Unit Display and RTRM
receive information from sensors and customer binary
contacts to satisfy the applicable request for ventilation,
cooling, dehumidification and heating.
Indoor Fan Failure Input
The Indoor Fan Failure Switch (IFFS) is connected to verify
indoor fan operation.
When there is a call for the indoor fan to be energized, the
differential pressure switch, connected to the Main Unit
Display, must prove airflow within 30 seconds or the Main
Unit Display will shut off all mechanical operations, lock
the system out and send a diagnostic alarm to the Unit
Display. The system will remain locked out until a reset is
initiated through the MCM via the Alarm Reset Function on
the Unit Display.
Low Pressure Control ReliaTel Control
This input incorporates the compressor low pressure
control (CLP 1/2) of each refrigeration circuit and can be
activated by opening a field supplied contact installed on
the OAUTS.
If this circuit is open before the compressor is started, the
ReliaTel™ control will not allow the affected compressor to
operate. Anytime this circuit is opened for 1 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 3 minutes
should the contacts close.
If four consecutive open conditions occur during the first
three minutes of operation, the compressor for that circuit
will be locked out, and a manual reset will be required to
restart the compressor.
Refrigerant Circuits
For OAB units (3–9 ton) and OAD units (5–7 tons), one
refrigerant circuit shall incorporate a standard 4- -row coil.
For OAD, OAG, OAK, and OAN units (8–54 tons), two
independent refrigerant circuits shall incorporate an
interlaced 4-row coil. All circuits shall have thermal
expansion valves (TXVs), service pressure ports, and
refrigerant line filter driers, suction line accumulators, and
revering valve as standard. An area will be provided for
replacement liquid line driers. The first refrigerant circuit
is equipped with a digital scroll.
High Pressure Control ReliaTel Control
The compressor high pressure controls (CHP 1/2/3/4) are
wired in series between the compressor outputs on
RTRM1 (CHP 1/2) and RTRM2 (CHP 3/4) and the
compressor contactor coils. If one of the high pressure
control switches opens, the respective RTRM senses a lack
of current while calling for cooling and locks the
compressor out.
On dual circuit units, if the high pressure control opens,
the compressor on the affected circuit is locked out. A
manual reset for the affected circuit is required.
Содержание Horizon OABE/F
Страница 32: ...Unit Clearances Curb Dimensions and Dimensional Data 32 OAU SVX004D EN ...
Страница 37: ...Unit Weight and Rigging OAU SVX004D EN 37 ...
Страница 55: ...Installation OAU SVX004D EN 55 ...
Страница 78: ...Performance Data 78 OAU SVX004D EN ...
Страница 84: ...Appendix 84 OAU SVX004D EN Figure 79 BAYSENS036A installation instructions ...
Страница 85: ...Appendix OAU SVX004D EN 85 Figure 80 VELCON 0351 installation instructions ...
Страница 89: ...Appendix OAU SVX004D EN 89 ...
Страница 90: ......
Страница 91: ......