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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 instructions could result in personal injury and/or property damage!
General Safety Information
This appliance is not intended for use by persons
(including children) with reduced physical, sensory
or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision
or instruction concerning use of the appliance by the
person responsible for their safety. Children should
be supervised to ensure they do not play with this
appliance. 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.
Packaged Rooftop Ventilator
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.
Packaged Rooftop Ventilator
Document 475597
Model XRV
1
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Summary of Contents for Accurex XRV-10
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Page 1: General Safety Information
Document 475597 Model XRV Packaged Rooftop Ventilator 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 instructions could result in personal injury and/or property damage! General Safety Information This appliance is not intended for use by persons... -
Page 2: Table Of Contents
Table of Contents General Safety Information ..... . 1 Receiving, Handling, Storage ....3 Product Overview . -
Page 3: Receiving, Handling, Storage
Receiving Outdoor This product may have been subject to road salt during transit. If so, immediately wash off all visible white The unit should be placed on a level surface to prevent reside from all exterior surfaces. Upon receiving the water from leaking into the unit. -
Page 4: Product Overview
Model Cooling Capacity outdoors. Each unit has multiple options for cooling 3 to 7 tons XRV-10 and/or heating. The unit is designed to replace air that 5 to 15 tons is exhausted from the building and also heat and cool, XRV-25 as needed. -
Page 5: Subassemblies
Subassemblies Blower Air-Source Heat Pump Either one, two, or three plenum-type fans. All units are Units having an air-source heat pump will include either equipped with a plenum fan for Supply Air and a second one or two compressors, an indoor and outdoor coil, may be selected for Exhaust (Relief) Air. - Page 6 Subassemblies Low Sound Condenser Fans Outdoor Air Filters Condenser Coils (optional) Weatherhood Filters (metal mesh) Outdoor Air Damper Packaged DX Compressors Recirculating (optional) Damper Furnace Vest Plate Furnace Control Center Plenum-Type Coils (optional) Supply Air Blower (optional) Main Control Indirect Gas-Fired Furnace Center (optional) Packaged Rooftop Ventilator...
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Page 7: Installation
Installation Typical Unit Weights and Dimensions Housing size 10 Housing size 25 and 45 Housing size 75 Housing size 110 Component Access Optional Inverter Compressor VFD Optional Compressor/Electrical Optional Gas Furnace/Optional Electric Heater Electrical Supply Blower Coil Filters Exhaust Blower/Optional Electric Preheat Powered Exhaust Blower Section * When a powered exhaust fan is selected, door 8 will be to the immediate right of door 7. - Page 8 Intake Nominal Outdoor Supply Return Exhaust Model tonnage Height (H) Width (W) Section weight (lbs) Intake Discharge Intake Discharge (tons) Bottom XRV-10 58.1 44.0 /111.5 7&9 22.3 1,225 or End XRV-25 5-15 59.3 52.5 98.6 /149.5 22.1 30.1 3,150 Bottom,...
- Page 9 Vestibule Mounted Outdoor Indoor Side Other Section (not shown) with IG Mounted Mounted Furnace XRV-10 XRV-25 XRV-45 XRV-75 XRV-110 All dimensions are shown in inches. *No condensing section or piping vestibule, or unit has top condensing section. Packaged Rooftop Ventilator...
- Page 10 Installation Additional Clearances for Handling Concerns for Packaged DX Units Packaged DX or Air-Source Heat Pump Packaged DX units require additional clearance Units with PDX or ASHP have a system that is because they must have unrestricted air movement pressurized with refrigerant. If damage occurs, the around the condenser coil and condenser fans.
- Page 11 Installation Lifting Rail Mounting and Layout • The units may be installed on rails provided and WARNING installed by others. Ensure that rails are designed to Spreader bars are required to prevent damage to the handle the weight of the unit and provide proper load cabinet, failure to do so can result in damage that is distribution on building supports.
- Page 12 Installation Optional Piping Vestibule Roof Curb Mounting If the unit was ordered with the vestibule, the NA (Non- Roof curb details, including duct locations and Access side) clearance dimension must be measured dimensions, are to be found in the roof curb assembly from the vestibule.
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Page 13: Recommended Electrical And Gas Supply Entry Locations
Recommended Electrical and Gas Supply Entry Locations Manufacturer recommends that electrical service and Optional Gas Piping gas supply be brought into the cabinet through the Units with indirect gas-fired furnaces require field- end wall, as shown below. There are three penetrations supplied and installed gas supply piping. -
Page 14: Piping Installation
Refer to Drain Trap XRV-10 housing in which the hot water coil will be section. directly downstream of the supply fan. The coil section... -
Page 15: Electrical Information
Electrical Information Determine the Size of Electric Heater WARNING Wiring The roof lining contains high voltage wiring. To prevent An optional electric heater may require a separate electrocution, do not puncture the interior or exterior power supply. The power connection should be made panels of the roof. -
Page 16: Control Center Components
Control Center Components Main Control Center Components Image represents a typical housing 25 or 45 installation. Components and locations will vary on housing sizes 10, 75 and 110. Electrical Cabinet 1. Power distribution block; high voltage supply is terminated here Electrical Cabinet 2. -
Page 17: Component Operation
Component Operation Optional Component Operation Phase Monitor Exhaust Fan VFD Sequence The unit control circuitry includes a phase monitor that Optional Building Static Pressure Sensor: The constantly checks for phase reversal, phase imbalance, exhaust fan is modulated based upon the signal from loss of phase or a power brownout. - Page 18 Optional Component Operation Electronically Commutated (EC) Airflow Monitor Condenser Fans with Inverter Scroll or IMPORTANT Digital Scroll Compressors For the outdoor airflow monitoring device to perform The EC condenser fan(s) will modulate up and down as intended, field calibration is required. Calibration of to maintain the optimal liquid line pressure using built the airflow monitoring device requires an independent in control sequences within the factory controller.
- Page 19 Optional Component Operation VFD Compressor Needlepoint Bipolar Ionization (NPBI®) If the VFD compressor option is included, the Needlepoint bipolar ionizers are mounted on the fan compressor VFD is mounted in the end of the inlet cone(s) and provide air disinfection. The ionizers condensing section.
- Page 20 This page is intentionally left blank for printing purposes. Packaged Rooftop Ventilator...
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Page 21: Factory-Installed Refrigeration Systems
Factory-Installed Refrigeration System Components Packaged DX Cooling with Three Way Hot Gas Reheat and Hot Gas Bypass 1. Compressor 6. Condenser Fans 2. High Limit Pressure Switch 7. Condensing Coil The switch opens when refrigerant pressure 9. Liquid Line Filter Drier increases above the set point in the discharge line. - Page 22 Factory-Installed Refrigeration System Components Air-Source Heat Pump with Three Way Hot Gas Reheat Outdoor Air ow Supply Air ow Outdoor Air ow Supply Air ow Packaged Rooftop Ventilator...
- Page 23 Factory-Installed Refrigeration System Components 1. Compressor 2. High Limit Pressure Switch The switch opens when refrigerant pressure increases above the set point in the discharge line. A manual reset is then required. 3. Hot Gas Reheat Valve (optional) Units equipped with a reheat coil use a three- way valve with actuator to control the supply air discharge temperature of the unit during dehumidification mode.
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Page 24: Start-Up Components
Start-Up Components Supply/Exhaust Fan The fan should be checked for free rotation. If any The optional exhaust fan is a direct-drive plenum type. binding occurs, check for concealed damage and Fan speed is controlled by a VFD which, in turn, is foreign objects in the fan housing. - Page 25 Start-Up Components Communication Setup Airflow Monitoring For additional information on how to navigate through 1. Press the UP and DOWN keys at the same time for the airflow controller menus, refer to technical manuals 3 seconds from GreenTrol® Automation Inc. at www.greentrol. 2.
- Page 26 Start-Up Components Optional Dirty Filter Switch To adjust the switch, the unit must be running with all of the access doors in place, except for the compartment where the switch is located (exhaust intake compartment). The adjusting screw is located on the top of the switch.
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Page 27: Alarms
Troubleshooting – Alarms Several of the electronic controls in the unit monitor the system for faults and will go into alarm, shutting down the unit or a single function within the unit. Microprocessor Controller Check the screen on the microprocessor for an alarm condition. -
Page 28: Unit
Troubleshooting – Unit Symptom Possible Cause Corrective Action Blown fuse or open circuit breaker. Replace fuse or reset circuit breaker and check amps. Defective motor or capacitor. Replace. Blower fails Motor overloaded. Reset VFD and check amps. to operate Check for On/Off switches. Check for correct supply Electrical. -
Page 29: Refrigeration Circuit
Troubleshooting – Refrigeration Circuit TROUBLESHOOTING NOTE IMPORTANT Do not release refrigerant to the atmosphere! If required service procedures include the adding or Before any components are changed on the removing of refrigerant, the service technician must refrigeration system, the cause of the failure must be comply with all federal, state and local laws. - Page 30 Troubleshooting – Refrigeration Circuit Symptom Possible Cause Corrective Action Refrigerant overcharge. Check pressures, charge by subcooling. Compressor Condenser fan motor defective. Check fan motor. starts but cuts out Condenser coil inlet obstructed or dirty. Check coil and clearances. Clean coil if necessary. on high Check high side equalized pressures, check expansion pressure...
- Page 31 Troubleshooting – Refrigeration Circuit Symptom Possible Cause Corrective Action Check subcooling, check for leak. Repair leak and add Insufficient refrigerant charge. refrigerant. Defective or improperly adjusted Check superheating and adjust thermal expansion valve. expansion valve. discharge pressure Low suction pressure. See “low suction pressure”.
- Page 32 Troubleshooting – Refrigeration Circuit Symptom Possible Cause Corrective Action Check subcooling, check for leak. Repair leak and add Insufficient refrigerant charge. refrigerant. Defective or improperly adjusted Check superheating and adjust thermal expansion valve. expansion valve. discharge pressure Low suction pressure. See “low suction pressure”.
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Page 33: Routine Maintenance
Routine Maintenance Annually DANGER It is recommended that the annual inspection and Electric shock hazard. Can cause injury or death. maintenance occur at the start of the cooling season. Before attempting to perform any service or After completing the checklist, follow the unit start-up maintenance, turn the electrical power to the unit to checklist provided in the manual to ensure the OFF at disconnect switch(es). - Page 34 Routine Maintenance Maintenance Procedures: WARNING Lubrication - Check all moving components for REFER TO GENERAL SAFETY INFORMATION proper lubrication. Apply lubricant where required. Do not operate this unit without the filters and Any components showing excessive wear should be birdscreen installed. They prevent the entry of foreign replaced to maintain the integrity of the unit and ensure objects such as leaves, birds, etc.
- Page 35 Outdoor Air Supply Final Pre-Wheel Model Weatherhood Exhaust Filters Filters Outdoor (Aluminum Mesh) (Pre-coil) XRV-10 (1) 16x20x1 (1) 12x24 + (1) 24x24 XRV-25 (4) 20x20x2 (4) 20x20 (5, 7, 10 tons) XRV-25 (4) 20x20x2 (2) 20x20 + (2) 20x24 (12.5, 15 tons)
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Page 36: Venting Connection Locations
Reference - Venting Connection Locations 200-300MBH 100-150MBH COMPRESSOR / CONTROL CENTER COMPRESSOR / CONTROL CENTER ACCESS ACCESS COMBUSTION AIR INLET COMBUSTION AIR INLET EXHAUST OUTLET EXHAUST OUTLET IG FURNACE IG FURNACE ACCESS ACCESS 300-400MBH 500MBH COMPRESSOR CONTROL CENTER COMPRESSOR CONTROL CENTER ACCESS ACCESS ACCESS... - Page 37 Reference - Venting Connection Locations Cont. (Model XRV-110) NO indoor venting options available EXHAUST OUTLET COMBUSTION AIR INLET EXHAUST OUTLET COMBUSTION AIR INLET IG Venting Location Inlet Dimensions Outlet Dimensions Furnace Model Size Edge Length Height Length Height (MBH) Thickness 6 13.8 17.2 20.5 50 NA NA NA NA NA 21.5...
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Page 38: Rated Airflow
Reference - Rated Airflow Model Airflow (SCFM) Model Airflow (SCFM) XRV-10-3I 1100 XRV-45-17.5(I,J) 4100 XRV-10-4I 1450 XRV-45-17.5A 5500 XRV-10-5I 1700 XRV-45-20(I,J) 4700 XRV-10-6I 1600 XRV-45-20A 6400 XRV-10-7I 1700 XRV-45-25(I,J) 5100 XRV-25-5I 3075 XRV-45-25A 7200 XRV-25-5A 3400 XRV-45-30(I,J) 5700 XRV-25-7(I,J) 2300... - Page 39 This page is intentionally left blank for printing purposes.
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Page 40: Our Commitment
As a result of our commitment to continuous improvement, Accurex reserves the right to change specifications without notice. Product warranties can be found online at accurex.com, either on the specific product page or in the Warranty section of the website at Accurex.com/Resources/Warranty.
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