valent VXE-112 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-112 Specifications

General

Brand	valent
Model	VXE-112
Category	Air Handlers
Language	English

Summary

General Safety Information

Electrical Information

Control Center Components

Component Operation

Factory-Installed Refrigeration System Components

Packaged DX Cooling with Three Way Hot Gas Reheat and Hot Gas Bypass

Air-Source Heat Pump with Three Way Hot Gas Reheat

Start-Up Unit

DANGER

Electric shock hazard. Turn power OFF before service or maintenance.

Pre-Start-Up Checklist

Check all fasteners, fans, dampers, wiring, and components.

WARNING

Start-Up Procedure

Collect data while unit is running; ensure checklist is complete.

Voltage Imbalance

Start-Up Checklist - General

Motor Amp Draw

Fan RPM

Start-Up Checklist - Packaged Direct Expansion (DQX)

Superheat

Record superheat values for various VX/VXE models.

Subcooling

Record subcooling values for various VX/VXE models.

Moisture Indicating Sight Glass

Start-Up Checklist - Air-Source Heat Pump (ASHP)

Cooling

Heating

Start-Up Components

Airflow Monitoring

Optional Dirty Filter Switch

Fan Wheel Rotation Direction

Field Calibration

Vibration

Optional Energy Wheel

Start-Up

Maintenance

Adjust the Air Seals

Optional Energy Wheel – Troubleshooting

Troubleshooting – Alarms

Troubleshooting – Unit

Blower fails to operate

Excessive noise or vibration

Check fasteners, bearings, mounting, and duct support.

Troubleshooting – Refrigeration Circuit

Compressor will not run or does not start

Check power, contactor, fuses, voltage, motor, and wiring.

Compressor starts but cuts out on high pressure switch

Check pressures, fan motor, coil, switches, and lines.

High suction pressure

Check load, valve bulb, and superheat.

Not enough capacity or lack of performance

Check coil cleanliness, refrigerant, airflow, restrictions, and load.

Compressor starts but cuts out on low pressure

Check thermostat, wiring, refrigerant charge, and airflow.

Compressor noisy or vibrating

Check tubing vibration, scroll rotation, and compressor mounting.

High discharge pressure

Check fan motor, condenser coil, refrigerant charge, and load.

Liquid line is frosted or wet

Check for restriction in the liquid line.

Routine Maintenance

Coil Maintenance

Maintenance Procedures:

Internal Filter Maintenance

External Filter Maintenance

Reference - Venting Connection Locations

Reference - Venting Connection Locations Cont. (Models VX/VXE-352)

Reference - Rated Airflow

Unison Air Handler Start-Up Form

Exterior Air Handler Inspection

Checks for shipping damage, caulking, access doors, and ductwork.

Split Air Handler Inspection

Checks exterior joints, section alignment, bolts, foam gasket, and wiring.

Control Cabinet Inspection

Inspect terminal display, wiring connections, sensors, and schematics.

Dampers

Check damper response to control commands and smooth operation.

Blowers and Blower Motors

Check fasteners, alignment, rotation, belt tension, and overloads.

VFD Parameters

Record all parameters modified from VFD default settings.

Indirect Fired Gas Furnace

Record furnace details and perform component inspection.

IDF Furnace Performance Readings

Record gas pressure, CO2, temperature, and air temp rise readings.

Electric Heater

Perform electrical and operational inspections, record output values.

Integral AC System

Record condenser fan amp draw and compressor readings.

Compressors Active

Record operating data for heating/cooling modes, reheat, and water valve.

Heat Pump

Record operating data for heat pump circuits in cooling and heating.

Water Coil

Inspect water valve, system air, glycol; record temperatures and pressures.

Energy Recovery Wheel

Inspect cassette, rotor, seals, motor; check system start-up.

DDC Controller

Verify wiring, inputs, outputs, sensors, and controller configuration.

DDC Mode of Operation Testing

Confirm heating, cooling, economizer, defrost, dehumidification, reheat, and fan modes.

DDC Parameters

Record default and active parameter settings; note any changes.

Interior Air Handler Inspection

Checks for damage, debris, damper seals, and fasteners.

Power Inspection

Verify line phasing and voltage levels against nameplate.