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General| Brand | valent |
|---|---|
| Model | VX Series |
| Category | Air Handlers |
| Language | English |
Qualified personnel should follow safety instructions and precautions for installation and maintenance.
Avoid electrocution by not puncturing roof panels, which contain high voltage wiring.
Always disconnect power before working on equipment; lock and tag disconnect switch.
Evacuate area if refrigerant leak occurs; EPA Certified Technician required for repairs.
Internal components may be hot; allow time for cooling before servicing.
Check product for damage and verify line items against delivery receipt.
Use lifting brackets and handle to avoid scratching or chipping the coating.
Store units indoors in a low humidity atmosphere or outdoors on a level surface.
Inspect units monthly, check for moisture/dirt, and rotate fan wheel.
Inspect unit assembly for working order before installation.
Units offer Packaged DX or Air-source heat pump (ASHP) cooling options.
Heating options include gas-fired furnace, electric heat, hot water coil, or air-source heat pump.
Unit supports Constant Air Volume (CAV) and Variable Air Volume (VAV) with recirculation options.
Models are listed per ANSI/UL 1995 and are ETL Certified.
Units have one or two plenum-type fans for supply and optional exhaust air.
Various optional coils include evaporator, condenser, indoor, outdoor, water, and reheat coils.
Packaged DX units have 1-4 compressors; ASHP units have 1-2 compressors.
Includes motorized intake, optional recirculating, return, and gravity-type exhaust dampers.
Discusses electric heater, filters, gas furnace, DX systems, ASHP, split DX, and vestibule.
Table and diagrams showing unit dimensions and weight for various models.
Table and diagram detailing required clearances for unit service and access.
Requires unrestricted air movement around condenser fans/coil; avoid placement under overhangs.
Use protective equipment due to refrigerant system; remove shipping materials before lifting.
Requires unrestricted air movement around outdoor coil/fans; avoid placement under overhangs.
Instructions for safe lifting using spreader bars and ensuring proper balance.
Details on installing factory-supplied or field-supplied roof curbs for unit mounting.
Clearance dimensions must be measured from the vestibule if ordered.
Instructions for installing units on rails provided by others.
Note on downblast discharge ductwork connection requirements.
Guidance on bringing electrical service and gas supply into the unit cabinet.
Requirements for field-supplied gas piping for indirect gas-fired furnaces.
Considerations for field-locating alternate entry locations.
Information for connecting gas supply line to optional gas furnace.
Details on factory-installed cooling/heating components and coil connection locations.
Installation guidelines for water coils, including support, connections, and freeze protection.
Installation of DX coils, including piping, connections, and components.
Importance of P trap for condensate drainage and freeze protection.
Optional switch for monitoring high condensate levels.
Guidance on selecting power supply and wiring for optional electric heaters.
Information on field-supplied electrical openings varying by unit size.
Instructions for connecting main power lines, electric heater lines, and grounding lug.
Requirements for a separate 115V power supply circuit for the convenience outlet.
Guidance on prewired components and field-wiring needs, including control circuit resistance.
Recommendation for service room and fuse selection for field-installed disconnects.
Diagram and list of components in the Electrical and Controls Cabinets.
Note on dual furnace installation and identical controls for parallel operation.
Unit control monitors phase reversal, imbalance, loss, or brownout and shuts down the unit.
Factory preset VFD controls blower speed for optimum performance; verify during test and balance.
Modulation of supply fan based on CO2, duct static, or building static pressure sensors.
Modulation of exhaust fan based on building static pressure or outdoor air damper position.
Modulation of OA/RA dampers based on CO2 levels or building static pressure.
Dedicated circuit for exhaust fan to run during power outage; not for high temp exhaust.
EC fan modulates speed to maintain highest liquid line pressure.
Conditions for operating in Cooling and Heating modes, including ambient temperature limits.
Field calibration required for airflow monitoring device performance.
Controls supply air discharge temperature during dehumidification using a three-way valve.
VFD compressor mounted in condensing section; envelope control safeties are critical.
VFD has oil return purge cycle; do not disable stator heat or oil return management.
Optional feature to prevent/control energy recovery wheel frosting via timed exhaust, electric preheat, or VFD.
Monitors energy wheel rotation; field-wiring for alarm notification.
Monitors filter pressure drop; requires field adjustments after ductwork completion.
Optimizes unit performance with supplemental heating/cooling; interfaces with BMS.
Provides recirculation damper for unoccupied mode control.
Diagram and list of components for DX cooling with hot gas reheat and bypass.
Diagram showing refrigerant circuit for ASHP with hot gas reheat.
Detailed list of components within the factory-installed refrigeration system.
Dangers and cautions for performing unit start-up, including electrical hazards and component handling.
Unit was factory tested; ensure proper operation by following start-up checklist.
Checklists for electrical, compressor, furnace, and water coil readiness before starting.
Steps for initial unit operation, including jumpering controls and checking fan/compressor rotation.
Explanation of voltage imbalance and formula for calculation to prevent motor failure.
Records line voltage, motor amp draw, fan RPM, and compressor/outdoor fan data.
Checklist for DX unit parameters including superheat, subcooling, pressures, and temps.
Checklist for ASHP parameters in cooling and heating modes, including superheat and subcooling.
Check fan for free rotation, consult manufacturer for changing operating conditions.
Information on plenum fans, including offset adjustment for efficient performance.
Check fan rotation by momentarily energizing; reverse leads if necessary.
Optional exhaust fan is direct-drive plenum type; speed controlled by VFD.
Causes and identification of excessive vibration during initial start-up.
Field-install sensor at least three duct diameters downstream of heat exchanger.
Instructions for navigating airflow controller menus and field calibration.
Steps to set up communication parameters (MODBUS, NETADDR, NETBAUD, PARITY) for airflow monitor.
Procedure to adjust the dirty filter switch while the unit is running.
Procedure to adjust the hot gas bypass valve for optimal performance.
Adjusting air seals for minimum leakage and proper energy transfer efficiency.
Inspect drive belt for smooth ride in pulley and proper alignment.
Procedure to adjust perimeter and diameter seals for optimal fit against the wheel.
Economizer lockout conditions and wheel stop/modulate sequences for cooling.
How microprocessor controller initiates preheat or modulating wheel for frost control.
General maintenance and inspection of the energy wheel for cleanliness and wear.
Inspect wheel for cleanliness, drive motor, belt, and pulley; clean if necessary.
Procedure for cleaning wheel segments using sprays or washes; avoid harsh chemicals.
Instructions for reinstalling wheel segments, ensuring correct face and retaining clips.
Inspect belts for wear or damage; contact manufacturer for replacement.
Contact manufacturer representative for bearing replacement instructions.
Symptom/cause/action table for energy wheel not turning or running intermittently.
How to interpret and reset microprocessor alarms and fault codes.
Indicates operational status and fault conditions via LED lights.
VFD display shows alarms; hard restart required for faults like voltage spikes.
Chart of fault codes for digital scroll compressor controller, including lockout conditions.
Troubleshooting steps for blower failure due to fuses, motors, or electrical issues.
Addresses starter chatter due to long control wiring or low voltage.
Diagnoses motor over-amping from incorrect voltage, low horsepower, or winding issues.
Troubleshoots low airflow due to fan direction, dirty filters, or static pressure.
Addresses high airflow from excessive fan speed or missing filters.
Identifies causes of noise/vibration from fan wheels, bearings, or ductwork.
Diagnoses issues preventing compressor start, including power, contactors, and low voltage.
Troubleshoots low pressure cutouts due to refrigerant charge or airflow restrictions.
Addresses low pressure switch cutout at specific PSIG values.
Diagnoses high pressure cutouts due to refrigerant charge, fan issues, or obstructions.
Troubleshoots thermal overload issues related to compressor overheating or wiring.
Addresses hums without starting due to start relay, winding damage, or low voltage.
Diagnoses compressor noise/vibration from tubing, rotation, or mounting.
Addresses high suction pressure due to evaporator load, unloaded compressor, or expansion valve.
Troubleshoots high discharge pressure from fan issues, refrigerant charge, or coil cleanliness.
Diagnoses low suction pressure from refrigerant leaks, dirty coils, or airflow restrictions.
Addresses low discharge pressure from refrigerant charge or expansion valve issues.
Troubleshoots short cycling from faulty controls or poor air distribution.
Diagnoses oil loss from refrigerant leaks or improper crankcase heater operation.
Addresses capacity issues from refrigerant charge, dirty coils, or excessive load.
Diagnoses liquid line frosting from restrictions or insufficient airflow.
Troubleshoots suction line frosting from airflow or expansion valve issues.
Normal on ASHP in heating mode; check valve function if not.
Recommended maintenance frequency: monthly, semiannually, and annually.
Includes cleaning external filters and replacing internal filters.
Includes checking motors, bearings, condensate drains, and coils.
Includes lubrication, damper checks, blower inspection, door seals, wiring, and cabinet cleaning.
Check moving components for proper lubrication and replace worn parts.
Ensure dampers open/close properly; check motorized dampers via actuator.
Maintain furnace per Indirect Gas-Fired Heat IOM.
Clean motor exterior, check lubrication, and refer to manufacturer's website for schedules.
Clean wheel/housing if imbalanced; check fasteners for tightness.
Clean coils annually or more frequently if dirty; use appropriate pressure for cleaning.
Check and replace 2-inch pleated paper filters as needed to ensure proper airflow.
Check and clean aluminum mesh filters in supply weatherhood regularly.
Table detailing filter types, sizes, and quantities for various unit models.
Diagrams and dimensions for IG furnace venting connections for smaller models.
Table of dimensions and flue connection sizes for VX/VXE-112 and VX/VXE-212 models.
Diagrams and dimensions for IG furnace venting connections for larger models.
Table of dimensions for IG venting, inlet, and outlet for VX/VXE-352 models.
Table listing rated airflow in SCFM for various VX models.
Table listing rated airflow in SCFM for various VXE models.
Provides contact details for technical support and Valent Air Management Systems.
Directs users to schematics and online literature for manuals and configuration questions.
Covers defects in materials/manufacture for 12/18 months; excludes labor and consumables.
Offers a limited 60-day labor warranty upon completion of qualified start-up.
Unison does not warranty third-party components; support limited to basic functionality verification.
