valent VX-212 User Manual

Document 483593
Model VX / VXE
Dedicated Outdoor Air Unit
Dedicated Outdoor Air Unit 1
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
General Safety Information
WARNING
The roof lining contains high voltage wiring. To
prevent electrocution, do not puncture the interior or
exterior panels of the roof.
DANGER
• Always disconnect power before working on or near
this equipment. Lock and tag the disconnect switch
or breaker to prevent accidental power up.
• If this unit is equipped with optional gas accessories,
turn off gas supply whenever power is disconnected.
CAUTION
This unit is equipped with a compressed refrigerant
system. If a leak in the system should occur,
immediately evacuate the area. An EPA Certified
Technician must be engaged to make repairs or
corrections. Refrigerant leaks may also cause bodily
harm.
CAUTION
When servicing the unit, the internal components may
be hot enough to cause pain or injury. Allow time for
cooling before servicing.
Only qualified personnel should install and maintain this
system. Personnel should have a clear understanding of
these instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards. Other
considerations may be required if high winds or seismic
activity are present. If more information is needed,
contact a licensed professional engineer before moving
forward.
1. Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC), the National
Fire Protection Agency (NFPA), where applicable.
Follow the Canadian Electrical Code (CEC) in
Canada.
2. All moving parts must be free to rotate without
striking or rubbing any stationary objects.
3. Unit must be securely and adequately grounded.
4. Do not spin wheel faster than maximum cataloged
fan RPM. Adjustments to fan speed significantly
affect motor load. If the fan RPM is changed, the
motor current should be checked to make sure it is
not exceeding the motor nameplate amps.
5. Verify that the power source is compatible with the
equipment.
6. Never open access doors to the unit while it is
running.

valent VX-212 Specifications

General

Brand	valent
Model	VX-212
Category	Air Handlers
Language	English

Summary

General Safety Information

Safety Guidelines and Warnings

Essential safety precautions, warnings, dangers, and cautions for installation and maintenance.

Installation

Installation Clearances

Specifies required clearances around the unit for proper installation and maintenance.

Packaged DX Unit Clearances

Lifting and Mounting Procedures

Instructions and considerations for safely lifting and mounting the unit on a roof curb.

Rail Mounting and Ductwork

Electrical and Gas Supply Entry

Recommended Entry Locations

Recommended locations for bringing electrical service and gas supply into the unit cabinet.

Electrical Information

Power Line and Heater Wiring Sizing

Guidance on sizing main power lines and optional electric heater wiring.

Electrical Connection and Wiring Practices

Instructions for making electrical connections, wiring low-voltage components, and field disconnects.

Control Center Components

Main Control Center Layout

Component Operation

Phase Monitor and VFD Operation

Explains the function of the phase monitor and VFD for blower speed control.

Sensor-Based Control Sequences

Exhaust Fan and Damper Control

Optional Component Operation

Air-Source Heat Pump Operation

Hot Gas Bypass and Reheat Operation

VFD Compressor and Envelope Control

Frost Control Options

Factory-Installed Refrigeration Systems

Packaged DX System Components

Air-Source Heat Pump System Components

Unit Start-Up Procedures

Pre-Start-Up Checklist

Comprehensive checklist of tasks to perform before energizing the unit for the first time.

Start-Up Procedure and Voltage Checks

Step-by-step instructions for starting up the unit and checking voltage.

Start-Up Components Inspection

Fan Inspection and Setup

Procedures for checking fans, including rotation direction and offset adjustment.

Airflow Monitor Calibration

Energy Wheel Start-Up

Troubleshooting Guides

Energy Wheel Troubleshooting

Unit Operational Faults

Troubleshooting guide for unit-level issues like blower failure, motor problems, and airflow.

Refrigeration Circuit Faults

Diagnosing and resolving issues related to the compressor, refrigerant, and pressure controls.

Routine Maintenance

Maintenance Schedule and Procedures

Guidelines on how often to perform maintenance and specific procedures for components.

Filter Maintenance and Specifications