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Accurex XRV-25, Инструкция по установке, эксплуатации и обслуживанию, Страница: 12 / 32

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Packaged Rooftop Ventilator

12

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

 2. Fuse holders
 3. Phase monitor
  4.  Compressor motor contactors
  5.  Condensing fan motor contactors
  6.  Wheel motor contactor
 7. Transformer
 8. Unit Disconnect

Low Voltage Side

 9. Microprocessor controller
 10. Monitoring points
 11. Low voltage terminal strip
 12. Relays
 13. Dirty filter switch
 14. Outdoor airflow monitor
 15. Exhaust airflow monitor
 16. Digital scroll controller

Optional Indirect Gas-Fired Furnace

Note: In some models, two furnaces are installed to provide greater output. When two furnaces are installed, they are 
in parallel and both will operate at the same time and the same output. Both furnaces will have identical controls.

 1. Single-stage valve
 2. Modulating valve
  3.  PCOE expansion board
 4. Ignition controller
 5. Transformer
 6. Combustion blower
 7. Burner manifold
 8. Collector box

For further information on the optional furnace and its control center, see the Indirect Gas-Fired Heat lOM shipped 
with the unit.

HIGH VOLTAGE SIDE

LOW VOLTAGE SIDE

4

1

2

3

5

6

7

2

4 5

2

13

14

15

16

12

11

10

9

4

4

8

Accessible via control center door

Accessible via compressor door

5

1

2

4

3

6

7

8

5

1

2

4

3

6

7

8

Dual furnaces shown. Available on housing 80 and 120 with furnace capacities 500 MBH or higher.

Содержание XRV-25

Страница 1: ...hen 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...

Страница 2: ...n VFD Sequence 13 OA and Recirc Air Damper Sequence 13 Exhaust Fan Only Power 13 Vapor Tight Lights 13 EC Condenser Fans 14 Airflow Monitor 14 Dirty Filter Sensor 15 Microprocessor Control 15 Unoccupied Recirculation Damper 15 Vapor Tight Lights 15 Hot Gas Bypass Valve 15 Hot Gas Reheat Valve 15 Table of Contents Factory Installed Refrigeration System Components 16 Start Up Unit Model and Serial N...

Страница 3: ...ve any accumulations of dirt water ice or snow and wipe dry before moving to indoor storage To avoid condensation allow cold parts to reach room temperature Leave coverings loose to permit air circulation and to allow for periodic inspection The unit should be stored at least 3 in 89 mm off the floor Clearance should be provided to permit air circulation and space for inspection Outdoor The unit sh...

Страница 4: ...illed water coil Units with packaged DX are shipped fully charged with refrigerant and are ready for operation upon arrival Heating There are three different optional heat sources that can be ordered for this unit Indirect gas fired furnace with one or two sets of heat exchangers Electric heat with infinitely variable SCR control Hot water coil Airflow Arrangement The unit is capable of Constant Air ...

Страница 5: ...enser Coils optional Outdoor Air Damper Coils optional Recirculating Damper Main Control Center Furnace Vest Plate and Furnace Control Center optional Outdoor Air Filters Weatherhood Filters metal mesh Plenum Type Exhaust Air Blower Filters Two inch thick metal mesh filters in the outdoor weatherhood intake 2 inch thick pleated paper MERV 8 standard or MERV 13 filters in the air stream Optional 4 in...

Страница 6: ...ce Optional Electric Heater 4 Electrical 5 Supply Blower 6 Coil 7 Filters Unit Size Nominal tonnage tons Height H Width W Length L Intake A Condensing Section B Nominal weight lbs Outdoor Intake Supply Discharge Return Intake Exhaust Discharge XRV 25 5 15 59 3 52 5 98 6 22 1 30 1 2 700 End Bottom or Side Bottom End or Side End or Side XRV 45 15 30 72 5 68 2 109 27 7 30 1 4 500 XRV 70 20 45 90 68 1...

Страница 7: ... Unit Weights Dimensions section of this manual 3 Unit must be lifted by all lifting lugs provided at top of unit 4 Spreader bars must span the unit to prevent damage to the cabinet by the lift cables 5 Always test lift the unit to check for proper balance and rigging before hoisting to desired location 6 Never lift unit by weatherhood 7 Never lift units in windy conditions 8 Preparation of curb a...

Страница 8: ...l Shim the curb as required to level Install gasketing on top surface of curb provided by others 3 Install Ductwork Installation of all ducts should be done in accordance with SMACNA and AMCA guidelines Duct adapters are provided to support ducts prior to setting the unit 4 Set the Unit Lift unit to a point directly above the curb and duct openings Guide unit while lowering to align with duct open...

Страница 9: ... There are three penetrations into the cabinet that are required one for high voltage supply wiring one for low voltage control wiring and one for either gas supply or high voltage supply wiring for an electric heater WARNING Never drill holes in the roof of the unit There is high voltage wiring located between the inner and outer roof panels Damage to the wiring could cause severe bodily harm or ...

Страница 10: ...reaking the weld between coil connection and header 2 Connect the water supply to the bottom connection on the air leaving side and the water return to the top connection on the air entering side Connecting the supply and or return in any other manner will result in very poor performance Be sure to replace factory installed grommets around coil connections if removed for piping Failure to replace ...

Страница 11: ...ter disconnect and must be compatible with the ratings on the nameplate supply power voltage phase and amperage Consult ANSI NFPA 70 and CSA C22 1 for proper conductor sizing Provide the Opening s for the Electrical Connections Electrical openings vary by unit size and arrangement and are field supplied Connect the Power Supplies Connect the main power lines and electric heater power lines to the d...

Страница 12: ...controller Optional Indirect Gas Fired Furnace Note In some models two furnaces are installed to provide greater output When two furnaces are installed they are in parallel and both will operate at the same time and the same output Both furnaces will have identical controls 1 Single stage valve 2 Modulating valve 3 PCOE expansion board 4 Ignition controller 5 Transformer 6 Combustion blower 7 Burn...

Страница 13: ...ain room air temp at a desired set point Optional 0 10 VDC by others to VFD Supply fan is modulated by a 0 10 VDC field provided by others Component Operation Exhaust Fan VFD Sequence Optional Building Static Pressure Sensor The exhaust fan is modulated based upon the signal from a building static pressure sensor The microprocessor will modulate the exhaust fan based upon a comparison of the buildi...

Страница 14: ... actual cubic feet per minute CFM or actual liters per second LPS on a 16 character LCD display Two configurable analog outputs for transmitting outdoor and or exhaust airflow rate outdoor air temperature or a proportional integral derivative PID control signal based on an outdoor airflow set point A configurable digital output that operates based on an airflow set point or range Operation Outdoor and ...

Страница 15: ...and or relative humidity sensor the unit can cycle on to maintain unoccupied room set points if there is a call for unoccupied heating cooling or dehumidification During the unoccupied mode the supply and exhaust if equipped fans will be off unless there is a call for cooling heating or dehumidification in the space Vapor Tight Lights Vapor tight lights provide light to each of the compartments in t...

Страница 16: ...able and is located on the side of the evaporator coil and can be accessed through the coil access panel 13 Evaporative Coil 14 Low Limit Pressure Switch The switch is installed on the suction line and disables the DX system when the suction pressure drops below the set point The switch will auto reset when the pressure rises above the auto reset set point 15 Service Access Ports 16 Hot Gas Bypass...

Страница 17: ... is below 40ºF Do not short cycle the compressor Allow 5 minutes between on cycles to prevent compressor damage DX system is charged with refrigerant Start up must be performed by EPA Certified Technician Every installation requires a comprehensive start up to ensure proper operation of the unit As part of that process the following checklist must be completed and information recorded Starting up ...

Страница 18: ...ower supplied to it 24 hours prior to start up If start up is scheduled in 24 hours unlock the disconnect power and energize unit Compressor shipping brackets are removed if provided SPECIAL TOOLS REQUIRED Voltage Meter with wire probes Amperage Meter Pressure Gauges refrigerant Tachometer Thermometer Incline manometer or equivalent Start Up Procedure The unit will be in operational mode during st...

Страница 19: ...r Air Temperature Deg F Outdoor Air Relative Humidity RH Return Air Temperature Deg F Return Air Relative Humidity RH Compressor 1 Compressor 2 Compressor 3 Compressor 4 L1 Amps Amps Amps Amps L2 Amps Amps Amps Amps L3 Amps Amps Amps Amps Crankcase Heater Amps Amps Amps Amps Superheat Should be between 7º and 9ºF Deg F Deg F Deg F Deg F Subcooling Should be between 10º and 12ºF Deg F Deg F Deg F D...

Страница 20: ...ation cannot locate the source of vibration a qualified technician using vibration analysis equipment should be consulted Generally fan vibration and noise is transmitted to other parts of the building by the ductwork To eliminate this undesirable effect the use of flexible connectors is recommended Discharge Air Temperature Sensor Units are supplied with a Discharge Air Temperature Sensor that is t...

Страница 21: ...e unit using the power disconnect s a Recycling of the power resets the manual override values that were set during the calibration Airflow Monitor For additional information on how to navigate through the airflow controller menus refer to technical manuals GF 2200A from GreenTrol Automation Inc at www greentrol com Field calibration procedure 1 Turn off power to the unit using the power disconnect ...

Страница 22: ...h as a voltage spike occurs the VFD will go into alarm and will not reset until a hard restart is performed See the unit specific manufacturer s manual supplied with the unit VFDs are located in the main control center Optional Digital Scroll Compressor Controller Present only if packaged DX with digital scroll option is selected The controller has three LED indicator lights One is green indicating...

Страница 23: ...er motor System static pressure too high Improve ductwork to eliminate losses using good duct practices Blower speed too low Check maximum motor RPM and compare with catalog data Verify that external control wiring is in place if required Fan wheels are operating backwards For 3 phase see Direction of Fan Wheel Rotation Direction in Start Up Components section Dirty filter Replace filters or follow ...

Страница 24: ...for reason and repair Replace fuse after correcting problem Low line voltage Check line voltage If more than 10 from compressor marking correcting is necessary Compressor motor protector open Motor thermal protector automatically resets Allow time 2 hours for compressor to cool down so protector will reset Restart and check for reason overheat occurred Compressor defective Check motor for open cir...

Страница 25: ...f compressor is hot allow compressor to cool for two hours Recheck for open circuit Improper refrigerant charge Check subcooling Improperly wired Review wiring schematics Loose wiring Check all connections Defective start relay Replace relay Motor windings damaged Verify amp draw Compressor hums but will not start Improperly wired Review wiring schematics Low line voltage Check voltage Loose wirin...

Страница 26: ... Check subcooling Remove excess refrigerant Non condensable in system Remove non condensable from system Dirty condenser coil Clean condenser coil Condenser fan not running or running backwards Check electrical circuit and fuse Check fan cycling controls High load conditions Add more equipment or reduce load Low suction pressure Refrigerant undercharge loss of refrigerant charge Check pressures an...

Страница 27: ...back Check thermal expansion valve setting Check for refrigerant overcharge Check crankcase heater operation Reheat flush cycle inadequate Contact factory Not enough cooling or lack of cooling Refrigeration undercharged Check subcooling Adjust charge if necessary Dirty filter or evaporator coil Check filter coil and airflow Dirty or clogged condenser coil Check coil and airflow Air or other non condens...

Страница 28: ...ris in the air which can be drawn into the filters and the coils they should be checked more frequently If the system is being used for only a few hours per day the frequency may be reduced Use the maintenance log at the end of this manual to record each maintenance session and observations and then establish a maintenance schedule that is appropriate for the installation The following is provided ...

Страница 29: ...tegral metal grid Two acceptable filter replacements are Aerostat Series 400 or Farr 30 30 Filters upstream of the coil should be checked regularly If the filters are dirty they should be cleaned or replaced It is important the filters stay clean to maintain desired airflow WARNING REFER TO GENERAL SAFETY INFORMATION Do not operate this unit without the filters and birdscreen installed They prevent the...

Страница 30: ...RV 45 300 14 8 23 3 38 1 44 1 6 6 6 400 6 6 6 500 14 9 23 6 25 2 57 1 6 6 6 B A C D 500MBH 300 400MBH A B C D 200 300MBH 100 150MBH C A B D C A B D COMBUSTION AIR INLET EXHAUST OUTLET IG FURNACE ACCESS CONTROL CENTER ACCESS COMPRESSOR ACCESS IG FURNACE ACCESS COMPRESSOR ACCESS COMPRESSOR CONTROL CENTER ACCESS IG FURNACE ACCESS IG FURNACE ACCESS COMPRESSOR CONTROL CENTER ACCESS COMBUSTION AIR INLET...

Страница 31: ...25 12 5S 3550 XRV 25 15I 3775 XRV 25 15D 3775 XRV 25 15S 3775 XRV 45 15I 4100 XRV 45 15D 4100 XRV 45 15S 4100 XRV 45 17 5I 4650 XRV 45 17 5D 4650 XRV 45 17 5S 4650 XRV 45 20I 5300 XRV 45 20D 5300 XRV 45 20S 5300 XRV 45 25I 5750 XRV 45 25D 5750 XRV 45 25S 5750 XRV 45 30I 5750 XRV 45 30D 5750 XRV 45 30S 5750 XRV 70 25D 6500 XRV 70 25S 6500 XRV 70 30D 7400 XRV 70 30S 7400 XRV 70 35D 7600 XRV 70 35S 7...

Страница 32: ..._______________________________________ _________________________________________________ Date ___________________Time _____________ AM PM Notes ___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ Date ______...

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