valent VXE-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 VXE-212 Specifications

General

Brand	valent
Model	VXE-212
Category	Air Handlers
Language	English

Summary

General Safety Information

High Voltage Warning

High voltage warning about roof lining and electrocution risk.

Disconnect Power

Critical safety step to disconnect power before any work.

Installation

Service Clearances

Table specifying required service clearances for unit access and operation.

Lifting Procedures

Safe lifting procedures and precautions for the unit.

Roof Curb Mounting

Instructions for mounting the unit on a roof curb.

Electrical and Gas Supply Entry

Roof Drilling Warning

Critical warning against drilling into the unit's roof due to high voltage wiring.

Piping Installation

DX Coil Piping Guidelines

Guidelines for installing DX coils and associated piping for split systems.

Electrical Information

High Voltage Roof Warning

Warning about high voltage wiring in the roof lining.

Disconnect Switch Safety

Warning about locking disconnect switches for safety.

Pre-Power Connection Instructions

Important instruction to read manuals before connecting power.

Electrical Code Compliance

Requirement to follow electrical codes for all wiring.

High Voltage Danger

Danger warning about high voltage electrical input.

Optional Component Operation

ASHP Defrost Cycle Information

Important information regarding defrost cycles for ASHP units.

Optional Component Operation Details

Airflow Monitor Calibration

Importance of field calibration for the airflow monitoring device.

Frost Control Options

Explanation of frost control options to prevent wheel frosting.

VFD Compressor Location

Location and function of the VFD compressor.

Microprocessor Controller Overview

Overview of the microprocessor controller's capabilities and features.

Factory-Installed Refrigeration System Components

Packaged DX Cooling System Diagram

Schematic of the Packaged DX cooling system with hot gas reheat and bypass.

Air-Source Heat Pump System Diagram

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

Thermostatic Expansion Valve (TVX)

Operation of the thermostatic expansion valve (TVX).

Four Way Reversing Valve

Function of the four-way reversing valve.

EXV or TXV Operation

Operation of EXV or TXV for refrigerant flow control.

Start-Up Unit

Electric Shock Hazard Warning

Danger warning about electric shock hazards during start-up.

Factory Test and Initial Checks

Warning about factory testing and initial checks for correct operation.

Pre-Start-Up Energization

Pre-start-up procedure for energizing the unit for 24 hours.

Comprehensive Start-Up Checklist

Checklist to be completed for proper unit start-up.

Start-Up Unit Procedures

Pre-Start-Up Checklist Items

Checklist items to perform before unit start-up.

Electrical Pre-Start Checks

Electrical checks to perform during pre-start-up.

Compressor Pre-Start Checks

Pre-start-up checks related to compressors.

Unit Start-Up Procedure

Step-by-step procedure for unit start-up.

Voltage Imbalance Calculation

Explanation and formula for calculating voltage imbalance.

Start-Up Checklist - General

Motor Amp Draw Recording

Table to record amperage draw for various motors.

Compressor Operating Conditions

Table to record compressor operating conditions.

Start-Up Checklist - Packaged DX

Compressor Electrical Data

Table for recording compressor electrical data.

Superheat Specs (VX/VXE-112, -212, -311)

Superheat specifications for specific models.

Subcooling Specs (VX/VXE-112, -212, -311)

Subcooling specifications for specific models.

Superheat Specs (VX/VXE-352)

Superheat specifications for VX/VXE-352 models.

Subcooling Specs (VX/VXE-352)

Subcooling specifications for VX/VXE-352 models.

Discharge Pressure Range

Expected discharge pressure range.

Suction Line Pressure Range

Expected suction line pressure range.

Start-Up Checklist - Air-Source Heat Pump

Compressor Electrical Data (ASHP)

Table for recording compressor electrical data.

Cooling Mode Superheat/Subcooling

Superheat and subcooling ranges for cooling mode.

ASHP Discharge Pressure Range

Expected discharge pressure range.

ASHP Suction Line Pressure Range

Expected suction line pressure range.

Heating Mode Superheat/Subcooling

Superheat and subcooling ranges for heating mode.

Start-Up Components - Airflow Monitoring

Airflow Monitor Field Calibration

Steps for field calibrating the airflow monitoring device.

Optional Energy Wheel Operation

Optional Frost Control Operation

How the microprocessor controls frost prevention.

Optional Energy Wheel Maintenance

Energy Wheel Maintenance Safety

Safety warning for maintenance on the energy wheel.

Optional Energy Wheel Troubleshooting

Troubleshooting: Wheel Not Turning

Troubleshooting step for when the energy wheel does not turn.

Troubleshooting: Intermittent Wheel Operation

Troubleshooting step for intermittent energy wheel operation.

Troubleshooting - Alarms

Microprocessor Controller Alarms

Alarms and indicators for the microprocessor controller.

Phase Monitor Indicators

LED indicators and fault conditions for the phase monitor.

VFD Alarm Displays

Alarm conditions and displays for Variable Frequency Drives.

Digital Scroll Compressor Controller Alarms

Information on the digital scroll compressor controller and its alarms.

Digital Scroll Fault Codes

Chart of fault codes for the digital scroll compressor controller.

Troubleshooting - Unit

Troubleshooting: Blower Failure

Troubleshooting steps for blower failure to operate.

Troubleshooting: Motor Starter Issues

Troubleshooting for motor starter issues.

Troubleshooting: Motor Over Amps

Troubleshooting for motor over-amperage conditions.

Troubleshooting: Low Airflow

Troubleshooting steps for low airflow conditions.

Troubleshooting: High Airflow

Troubleshooting steps for high airflow conditions.

Troubleshooting: Noise or Vibration

Troubleshooting steps for excessive noise or vibration.

Troubleshooting – Refrigeration Circuit

Troubleshooting: Compressor Not Starting

Troubleshooting for compressor failure to start.

Troubleshooting: Compressor Cuts Out (High Pressure)

Troubleshooting for compressor cutout due to high pressure.

Troubleshooting: Evaporator Coil Load

Troubleshooting for excessive evaporator coil load.

Troubleshooting: Low Discharge Pressure

Troubleshooting for low discharge pressure.

Troubleshooting: Compressor Cuts Out (Low Pressure)

Troubleshooting for compressor cutting out due to low pressure.

Troubleshooting: High Pressure Switch Cutout

Troubleshooting for high pressure switch cutout.

Troubleshooting: Unloaded Digital Scroll Compressor

Troubleshooting for unloaded digital scroll compressors.

Troubleshooting: Compressor Short Cycling

Troubleshooting: Low Pressure Switch Cutout

Troubleshooting for low pressure switch cutout.

Troubleshooting: Compressor Thermal Overload

Troubleshooting for compressor thermal overload cutout.

Troubleshooting: High Suction Pressure

Troubleshooting for high suction pressure.

Troubleshooting: Compressor Oil Loss

Troubleshooting: Compressor Hums, Won't Start

Troubleshooting for compressor humming but not starting.

Troubleshooting: High Discharge Pressure

Troubleshooting for high discharge pressure.

Troubleshooting: Insufficient Capacity

Troubleshooting: Compressor Noise/Vibration

Troubleshooting for noisy or vibrating compressors.

Troubleshooting: Low Suction Pressure

Troubleshooting for low suction pressure.

Troubleshooting: Frosted/Wet Liquid Line

Troubleshooting: Suction Line Frosting

Troubleshooting: Evaporating Coil Frost

Routine Maintenance Details

Coil Cleaning for Fragile Fins

Biological Hazard Warning

Warning about biological hazards and need for qualified personnel.

Unison Air Handler Start-Up Form

Start-Up Report Summary

Unison Air Handler Start-Up Form - Cabinet and Power

Control Cabinet Inspection Checklist

Power Inspection Checklist

Verification of power supply and voltage readings.

Unison Air Handler Start-Up Form - Compressor Readings

Compressor Performance Data

Detailed compressor performance data recording.

Unison Air Handler Start-Up Form - Operating Parameters

Compressor Operating Data by Mode

Comprehensive operational data for compressors in different modes.

Reference Operating Parameter Ranges

Unison Air Handler Start-Up Form - DDC Controller

DDC Controller Verification

Verification of DDC controller wiring, inputs, outputs, and configuration.

Unison Air Handler Start-Up Form - DDC Operation Testing

DDC Mode of Operation Testing

Testing of DDC controller modes like Heating, Cooling, Economizer.

Unison Air Handler Start-Up Form - DDC Parameters

DDC Parameter Settings

Table for documenting DDC parameter settings.