valent VXE-352 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 VXE-352 Specifications

General

Brand	valent
Model	VXE-352
Category	Air Handlers
Language	English

Summary

General Safety Information

Safety Warnings and Precautions

Key safety warnings and precautions for installation and maintenance.

Installation

Unit Weights and Dimensions

Service Clearances

Required clearances for service and operation based on unit size and configuration.

Installation Clearances and Handling

Clearances for DX/ASHP units, vestibule installation, and field power access.

Lifting and Roof Curb Mounting

Procedures for lifting the unit and mounting it on a roof curb.

Optional Vestibules and Ductwork

Electrical and Gas Supply Entry

Electrical and Gas Entry Locations

Recommended locations for electrical and gas supply entry and alternative options.

Piping Installation

Piping and Condensate Management

Electrical Information

Electrical Installation Details

Information on sizing power lines, wiring, connections, and disconnects.

Control Center Components

Control Center and Furnace Components

Component Operation

Component Operations

Specific Component Operations

Advanced Component Operations

Factory-Installed Refrigeration System Components

Packaged DX System Components

Diagram and list of components for Packaged DX cooling with hot gas reheat/bypass.

Air-Source Heat Pump System

Diagram of Air-Source Heat Pump system with hot gas reheat.

Air-Source Heat Pump Components

List and description of components for Air-Source Heat Pump systems.

Unit Start-Up Procedures

Pre-Start-Up Safety and Checklist

Critical safety warnings and the pre-start-up checklist for unit initialization.

Detailed Start-Up Checklist and Procedure

Comprehensive pre-start-up checks, electrical, compressor, furnace, and start-up procedures.

Start-Up Checklists

General Unit Performance Checks

Checklists for motor amp draw, fan RPM, fans, and compressor parameters.

DX Unit Performance Parameters

Checklist for DX unit compressor and system parameters during start-up.

ASHP Unit Performance Parameters

Checklist for ASHP unit compressor and system parameters during start-up.

Start-Up Components

Fan and Sensor Start-Up Checks

Airflow Monitoring Setup and Calibration

Optional Energy Wheel

Energy Wheel Start-Up and Operation

Energy Wheel Troubleshooting

Unit Troubleshooting

Common Unit Operational Problems

Refrigeration Circuit Troubleshooting

Refrigeration System Start-Up Issues

Troubleshooting steps for compressor start-up failures and low-pressure issues.

Refrigeration System Faults

Troubleshooting guide for high pressure cut-outs, thermal overload, and noisy compressors.

Refrigeration System Pressure and Load Issues

Diagnosing high/low pressure issues, evaporator load problems, and compressor unloading.

Refrigeration System Performance Issues

Troubleshooting capacity issues, frosted lines, and evaporating coil frosting.

Routine Maintenance

Maintenance Schedules

Recommended maintenance frequencies for monthly, semiannual, and annual tasks.

Detailed Maintenance Procedures

Step-by-step procedures for lubricating, checking dampers, cleaning coils, and filters.

Venting Connection Locations