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General| Brand | valent |
|---|---|
| Model | VX-352 |
| Category | Air Handlers |
| Language | English |
High voltage wiring in roof lining. Do not puncture panels to prevent electrocution.
Compressed refrigerant system. Evacuate area if leak occurs. EPA Certified Technician required for repairs.
Inspect units once per month while in storage. Keep a record of inspection and maintenance.
Provides a diagram and table detailing required clearances around the unit for servicing.
Use protective equipment due to refrigerant hazards. Remove all shipping materials before lifting.
Ensure shipping materials removed, use lifting lugs, spreader bars, test-lift, and never lift by weatherhood or in wind.
Details installation of factory-supplied roof curbs, ensuring levelness and proper duct alignment.
Details recommended entry points for electrical and gas supply into the unit cabinet.
Specifies requirements for field-supplied gas piping, connection size, and maximum pressure.
Connect main power and heater lines to disconnects, torque to recommendations.
Covers operation of exhaust fan, OA/RA dampers, and exhaust fan only power.
Important notes on defrost cycle, water drip, and snow accumulation.
Requires field calibration. Displays airflow in CFM or LPS. Has analog and digital outputs.
VFD controls compressor speed and monitors operating envelope.
Optional feature to prevent/control energy recovery wheel frosting using timed exhaust, electric preheat, or modulating wheel.
Optimizes performance with supplemental heating/cooling. Can interface with BMS.
Diagram and component list for DX cooling system with reheat and bypass.
Diagram and component list for ASHP system with reheat.
Comprehensive checklist covering electrical, compressors, gas, water, and general inspections.
Steps for unit start-up, including jumpering controls and checking rotation.
Explains how to determine and the importance of limiting voltage imbalance (max 2%).
Table for recording amperage for supply, exhaust, and condenser fans.
Identifies causes of excessive vibration and recommends corrective actions.
Details navigation and field calibration for the airflow controller.
Air seals must be adjusted for proper performance at start-up.
Procedure for adjusting air seals using a feeler gauge for proper contact.
Explains economizer, stop wheel, modulate wheel, and frost control sequences.
Disconnect power before maintenance. Inspect wheel for cleanliness and drive components.
Details microprocessor controller alarms and phase monitor indicators.
If in alarm, Alarm button blinks red. Refer to IOM for fault codes.
Displays alarm conditions; requires hard restart for reset.
Has three LEDs: power, alarm, and compressor status.
Lists fault codes, descriptions, and required actions (lockout, capacity reduction).
Check fuses, breakers, motor, overload, and wiring.
Check supply power, voltage, static pressure, and control wiring.
Check voltage, wiring, horsepower, windings, damper position, and static pressure.
Check fan rotation, filters, duct leaks, and obstructions.
Check fan speed and filter status.
Check fasteners, bearings, wheel seating, motor base, and duct support.
Check refrigerant charge, fan motor, coil cleanliness, discharge line, and high pressure switch.
Check evaporator load, compressor status, bulb insulation, superheat, and room load.
Do not release refrigerant. Comply with environmental laws. EPA certified technician required.
Allow compressor to cool, check for open circuits, subcooling, wiring, start relay, and windings.
Check condenser fan, coil cleanliness, refrigerant charge, non-condensables, and airflow.
Check disconnect, contactor, fuses, voltage, motor protector, compressor, and wiring.
Check start relay, motor windings, voltage, connections, and compressor mechanical damage.
Check airflow, filters, leaks, evaporator condition, filter-drier, bypass setting, expansion valve, and moisture.
Check thermostat, wiring, refrigerant charge, and airflow.
Check tubing vibration, scroll compressor rotation, compressor mounting, and for damage.
Check refrigerant pressure, restriction in line, or defective switch.
Check refrigerant charge, expansion valve, suction pressure, and condenser controls.
Check controls, air distribution, airflow, unit selection, refrigerant leak, and short cycling.
Check refrigerant charge, flood back, flush cycle, and subcooling.
Check coil cleanliness, airflow, non-condensables, line restrictions, controls, and load.
Check valve operation, bypass valve status, load, and airflow.
Detailed steps for lubrication, dampers, furnace, motors, wheels, and coils.
Biological hazard. Cleaning by qualified personnel.
Electric shock hazard. Ensure power is OFF before maintenance.
Use caution removing panels; components are heavy.
Guidelines for monthly, semiannual, and annual maintenance.
Verify line phasing, nameplate voltage, and supply voltage variations.
Check fasteners, bearings, belt tension, sheaves, shaft grounding, rotation, and overloads.
Records condenser fan amp draw and compressor readings for integral AC systems.
Records compressor readings and operating parameters for heat pump circuits.
Detailed recording of compressor parameters for heating/cooling modes.
System inspection and start-up checks for the energy recovery wheel.
Checks controller wiring, inputs, outputs, and I/O configuration.
Confirms air handler modes (heating, cooling, economizer, defrost, etc.) operate per sequence.
Records default and active parameter settings, and any changed parameters.
