Temspec VHC 30 Operation & Maintenance Manual Download

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The following is a typical self-contained refrigeration circuit.

EVAPORATOR

COIL

CONDENSER

COIL

OUTDOOR

AIR

MIXED

AIR

Sight Glass, Moisture Indicator

Pressure Test Port

Metering Device

Anti-Ice Control

Distributor

Crankcase Heater

Compressor

Filter Dryer

High Limit Pressure

Cut-Out

Low Limit Pressure

Cut-Out

-8-

Refrigeration Circuit

Summary of Contents for VHC 30

Page 1: ...ntenance Manual VHC VLC Series Unit Ventilator Form SC OM MANUAL rev 3 2019 06 12 2005 Temspec Incorporated IMPORTANT Read and save this manual for future reference This manual is to be left with the equipment owner ...

Page 2: ... VHC 30 VHC 36 VHC 48 VHC 60 5 OPERATION Sequence of Operation 6 Hot Water Circuit 7 Refrigeration Circuit 8 Electrical Circuit 9 Dampers 9 Optional Powered Exhaust 9 Filtration 9 MAINTENANCE Servicing the Unit 10 Maintenance Schedule 10 Changing the Filters 11 Cleaning the Condenser Coil 11 Cleaning the Evaporator Coil 12 Motors 12 TROUBLESHOOTING Basic Troubleshooting Guidelines 13 REPLACEMENT P...

Page 3: ... the unit s ducting capabilities an even distribution of air can be achieved throughout the room The unit ventilator is constructed with heavy guage metal and sound absorbing insulation for optimal sound attenuation By applying sound engineering principles and through continuous testing the highest quality of performance is obtained in the unit ventilators 1 ABOUT THE UNIT VENTILATOR NOMENCLATURE ...

Page 4: ...3 2 1 E A 7 10 11 9 8 S A 6 E A S A 18 E A Room Exhaust Air C E Condenser Exhaust Air 11 Return air damper 12 Single condenser fan 13 Compressor 14 Ceiling tile 15 Top extension duct shroud to suit ceiling height optional 16 Coil access panel removable with optional double deflection discharge grille 17 Filter access panel hinged 18 Removable access panel 19 Heavy duty return air grille FRONT ELEV...

Page 5: ... Supply Air 6 C E C A SIDE SECTION 30 R A 12 13 5 4 2 1 E A E A 11 10 7 S A C E Condenser Exhaust Air E A Room Exhaust Air FRONT ELEVATION 19 18 44 17 16 15 14 93 H 11 Return air damper 12 Dual condenser fans 13 Compressor 14 Ceiling tile 15 Top extension duct shroud to suit ceiling height optional 16 Coil access panel removable 17 Filter access panel hinged 18 Removable access panel 19 Heavy duty...

Page 6: ...DE SECTION 30 12 13 R A 5 4 O A 2 3 1 11 10 8 7 18 C E Condenser Exhaust Air 11 Return air damper 12 Compressor 13 Dual condenser fans 14 Ceiling tile 15 Top extension to suit ceiling height optional 16 Coil access panel removable with front double deflection grille 17 Filter access panel hinged 18 Removable access panel 19 Heavy duty return air grille FRONT ELEVATION 19 44 14 17 16 15 93 H S A S ...

Page 7: ...A C A 5 4 3 O A 1 2 E A 12 11 10 7 8 9 S A C E Condenser Exhaust Air E A Room Exhaust Air FRONT ELEVATION 18 17 44 16 15 14 S A 93 H 10 Filters 11 Return air damper 12 Modulating powered exhaust damper and actuator module optional 13 Compressor 14 Ceiling tile 15 Top extension duct shroud to suit ceiling height optional 16 Filter coil hinged access panel 17 Removable access panel 18 Heavy duty ret...

Page 8: ... mode the ability of the unit ventilator to provide sufficient cooling is limited only by the outdoor air temperature and the total C F M rating of the unit 4 Mechanical Cooling The unit ventilator utilizes the self contained refrigeration section incorporated within the unit DX coil condenser coil compressor and refrigerant expansion device The system maintains the cooling set point by cycling on...

Page 9: ...Hot Water With 2 way Control Valve Manual Air Vent 2 way Control Valve MIXED AIR HOT WATER COIL Strainer MV Isolation Valve HWS Isolation Valve Balancing Valve HWR Hot Water With 3 way Control Valve MIXED AIR C Strainer HOT WATER COIL NO NC 3 way Control Valve Manual Air Vent MV Isolation Valve HWS HWR Balancing Valve Isolation Valve 7 Hot Water Circuit ...

Page 10: ...VAPORATOR COIL CONDENSER COIL OUTDOOR AIR MIXED AIR Sight Glass Moisture Indicator Pressure Test Port Metering Device Anti Ice Control Distributor Crankcase Heater Compressor Filter Dryer High Limit Pressure Cut Out Low Limit Pressure Cut Out 8 Refrigeration Circuit ...

Page 11: ...to the wiring schematic for the damper actuator model type Internal powered exhaust is an optional feature that is provided with the VHC series This feature comes with a spring return damper actuator that is separate from the one used to control the outside air and return air dampers However the powered exhaust damper actuator is electrically linked to the outside air damper As the outside air dam...

Page 12: ... must remove a secondary panel located directly behind the return air access panel Interior and exterior environmental conditions will influence the required frequency of coil cleaning and filter change operations The following is a typical maintenance schedule for a classroom unit ventilator Initial Start Up Change out construction filters Verify that air paths are free of construction debris and...

Page 13: ...series Unfasten the removable section of the louver from the exterior side of the building VHC series Remove the unit ventilator return air access panel and condenser access panel from inside the room 3 Vacuum the entering air face of the condenser coil using a soft bristle attachment Be careful not to bend any of the aluminum fins on the coil 4 Use a foaming coil cleaning chemical such as Foam Br...

Page 14: ...ose offered by NU CALGON Follow the manufacturer s instructions for use Note Chlorine based or anti fungal pucks or socks are acceptable when placed in the evaporator drain pan Be sure to vacuum the drain pan after the cleaning process is complete and prior to adding the anti fungal component WARNING Do NOT use chlorine based cleaners or anti fungal treatments on the aluminum fins of any coil Tems...

Page 15: ...ot been tripped Check the fan relay to observe if it is energizing and de energizing properly Check that the 24V transformer is working properly Ensure that the wire connections are secured properly Compressor and condensing Ensure that there are no obstructions fans cycle on and off to the condenser air path Obstructions will cause the unit to cut out on high head pressure Check refrigerant charg...

Page 16: ...arranty period they will be supplied at no charge freight prepaid to the jobsite The cost of labor or incidental expenses incurred in the repair or replacement of parts does not form part of this warranty The warranty period commences from the date of shipment except when otherwise agreed at the point of sale see specific warranty terms and conditions for details Contact the factory at 1 888 TEMSP...

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