Table of Contents
Advertisement
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
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.
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
Advertisement
Table of Contents
Related Manuals for Accurex XRV-25-5I Series
Summary of Contents for Accurex XRV-25-5I Series
-
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 Only qualified personnel should install and maintain this... -
Page 2: Table Of Contents
Table of Contents General Safety Information ....1 Factory-Installed Refrigeration System Receiving, Handling, Storage ....3 Components . -
Page 3: Receiving, Handling, Storage
The unit should be placed on a level surface to prevent Receiving water from leaking into the unit. The unit should be This product may have been subject to road salt during elevated so that it is above water and snow levels. transit. -
Page 4: Product Overview
Product Overview A horizontally configured High Percentage Outdoor Air unit designed for installation either indoors or outdoors. Each unit has multiple options for cooling and/or heating. The unit is designed to replace air that is exhausted from the building and also heat and cool, as needed. -
Page 5: Subassemblies
Subassemblies Blower Filters - Two-inch thick metal mesh filters in the outdoor Either one or two plenum-type fans. All units are weatherhood intake, 2-inch thick pleated paper MERV 8 equipped with a plenum fan for Supply Air and a second (standard) or MERV 13 filters in the air stream. -
Page 6: Installation
Installation Typical Unit Weights and Dimensions Component Access Optional Inverter Compressor Optional Compressor/Electrical Optional Gas Furnace/Optional Electric Heater Electrical Supply Blower Coil Filters Nominal Condensing Nominal Height Width Length Intake Outdoor Supply Return Exhaust Unit tonnage Section weight Size Intake Discharge Intake Discharge... -
Page 7: Additional Clearances For Packaged Dx
Installation Additional Clearances for Lifting Packaged DX Units 1. Before lifting, be sure that all shipping materials have been removed from unit. Packaged DX units require additional clearance because they must have unrestricted air movement 2. To assist in determining rigging requirements, around the condenser coil and condenser fans. -
Page 8: Roof Curb Mounting
Installation Optional Piping Vestibule Roof Curb Mounting Roof curb details, including duct locations and If the unit was ordered with the vestibule, the NA (Non- Access side) clearance dimension must be measured dimensions, are to be found in the roof curb assembly instructions. -
Page 9: Rail Mounting And Layout
Installation Alternate Supply Entry Locations Each installation is unique and as a result, alternate Rail Mounting and Layout entry locations may be field-located. Before using any • The units may be installed on rails provided and alternate entry location, verify the suitability of the installed by others. -
Page 10: Piping Installation Optional Coil Piping
Piping Installation Optional Coil Piping Direct Expansion (DX) Coils (Split DX) 1. Piping should be in accordance with accepted Factory-installed cooling and heating components are industry standards. Pipework should be supported mounted in the coil section of the unit. Note the coil independently of the coils. -
Page 11: 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 12: Control Center Components Main Control Center
Control Center Components Main Control Center Components Image represents a typical XRV installation. Components and locations will vary on housing size and configuration. High Voltage Side 1. Power distribution block; high voltage supply is terminated here HIGH VOLTAGE SIDE Accessible via control center door 2. -
Page 13: Component Operation Phase Monitor
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 14: Ec Condenser Fans
Optional Component Operation Electronically Commutated (EC) IMPORTANT Condenser Fans with Standard Scroll or For the airflow monitoring device to perform as Digital Scroll Compressors intended, field calibration is required. Calibration of The EC condenser fan will the airflow monitoring device requires an independent modulate up and down to measurement of airflow and should be performed maintain the highest liquid... -
Page 15: Dirty Filter Sensor
Optional Component Operation Dirty Filter Sensor Hot Gas Bypass Valve (standard scroll) Dirty filter sensors monitor pressure drop across the On units equipped with hot gas bypass, hot gas outdoor air filters, exhaust air filters, or both. If the from the compressor is injected into the liquid line of pressure drop across the filters exceeds the set point, the evaporator coil after the thermostatic expansion the sensor will close a set of contacts in the unit control... -
Page 16: Factory-Installed Refrigeration System Components
Factory-Installed Refrigeration System Components Packaged DX Cooling with Three Way Hot Gas Reheat and Hot Gas Bypass 1. Compressor 13. Evaporative Coil 2. High Limit Pressure Switch 14. Low Limit Pressure Switch The switch opens when refrigerant pressure The switch is installed on the suction line and increases above the set point in the discharge line. -
Page 17: Start-Up Unit
Start-Up Unit DANGER WARNING Electric shock hazard. Can cause injury or death. Prior to starting up the unit, power must be energized Before attempting to perform any service or for 24 hours without a call for cool to allow the maintenance, turn the electrical power to unit to OFF compressor crankcase heaters time to boil off any at disconnect switch(es). -
Page 18: Pre-Start-Up Checklist
Start-Up Unit Pre-Start-Up Checklist IG Furnace If there is an indirect gas-fired furnace in this unit, Remove any foreign objects that are located in the refer to the manual provided with this unit for Pre- unit. Start-Up information. Check all fasteners, set-screws, and locking collars Gas piping is complete and gas lines are purged. -
Page 19: Start-Up Checklist
Start-Up Checklist Line Voltage. Check at unit disconnect. L1-L2 Volts L2-L3 Volts L1-L3 Volts Motor Amp Draw Supply Motor 1 Amps Amps Amps Amps Supply Motor 2 Amps Amps Amps Amps Exhaust Motor 1 Amps Amps Amps Amps Exhaust Motor 2 Amps Amps Amps Amps... -
Page 20: 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 21: Airflow Monitor
Start-Up Components Airflow Monitor e. Use the arrow buttons to get the supply override. For additional information on how to navigate through the airflow controller menus, refer to technical manuals 8. Measure the supply airflow rate of the unit using an GF-2200A from GreenTrol®... -
Page 22: Discharge Air Temperature Sensor
Troubleshooting – Alarms Several of the electronic controls in the unit monitor the Optional Digital Scroll Compressor system for faults and will go into alarm, shutting down Controller the unit or a single function within the unit. Present only if packaged DX with digital scroll option is Microprocessor Controller selected. -
Page 23: 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 24: 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 25 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 Condenser coil inlet obstructed or dirty. Check coil and clearances. Clean coil if necessary. cuts out on high Check high side equalized pressures, check thermal...
- Page 26 Troubleshooting – Refrigeration Circuit Symptom Possible Cause Corrective Action Check for high entering wet bulb temperature, check for Excessive load on evaporator coil. excessive air flow. Compressor is unloaded. Check digital scroll controller signal and solenoid valve. (digital scroll) Check the thermal expansion valve, ensure bulb is insulated.
-
Page 27: Refrigeration Circuit
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 28: 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- maintenance, turn the electrical power to the unit to up checklist provided in the manual to ensure the OFF at disconnect switch(es). -
Page 29: Maintenance Procedures Lubrication
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 30: 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 31: Rated Airflow
Reference - Rated Airflow AHRI Rating Conditions Model Airflow (SCFM) XRV-25-5I-* 2325 XRV-25-5D-* 2325 XRV-25-5S-* 2325 XRV-25-7.5I-* 2300 XRV-25-7.5D-* 2300 XRV-25-7.5S-* 2300 XRV-25-10I-* 2700 XRV-25-10D-* 2900 XRV-25-10S-* 2900 XRV-25-12.5I-* 3400 XRV-25-12.5D-* 3550 XRV-25-12.5S-* 3550 XRV-25-15I-* 3775 XRV-25-15D-* 3775 XRV-25-15S-* 3775 XRV-45-15I-* 4100 XRV-45-15D-*... -
Page 32: Maintenance Log
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.