1 KUH KUH PDS Horizontal Unit Heater 2.6 kw to 45 kw 208, 240, , 600 Volts Single or 3-Phase 8,900 to 153,600 BTU/Hour Wall or Ceiling Mounting Meets UL and CSA Requirements (600V CSA Certified Only) Description The KUH horizontal unit heater provides quiet, reliable fan-forced heating in all types of commercial and industrial structures. Each heater houses a bank of Chromalox patented metal sheath Fintube radiating heating elements with furnace brazed steel fins for long life and superior heat transfer. KUH heaters are versatile, flexible, high performance units that are easily installed in various mounting configurations for primary, supplementary or spot heating applications. Each unit is selfcontained in a rugged construction for long life and require little maintenance. Complementary to modern structure, these heaters have a good, clean appearance. For assured safety, all units meet the requirements of UL (File No. E7061) and CSA (File No. LR40859). Construction The cabinet is constructed of heavy 18-gauge steel, phosphate undercoated for corrosion resistance, and finished in gray powdercoat. Quiet, vibration-free operation is enabled through the combination fan guard and motor mount attached to the heating housing with rubber vibration isolators. Quality heating element construction assures years of maintenance-free operation. Applications The clean design and quality construction of the KUH heater, plus meeting UL and CSA requirements, make it a safe, appropriate heating choice for: Shipping Rooms Pump Houses Power Generating Stations Aircraft Hangers Factories Warehouses Garages Because it has individually adjustable discharge louvers to direct air flow, and can be wall or ceiling (plus swivel) mounted, the KUH heater may be used in a variety of heating applications: Primary Heating Supplementary Heating Dual System Heating Spot Heating Entryway Air Curtain Heating Phone: Fax: Chromalox, Inc.
2 Features Totally enclosed fan motor. Continuous duty with built-in thermal cutouts operates on same voltage as the heating circuit. Mount with threaded rods or optional wall or ceiling swivel mounting brackets. Seismic rated. Field installed disconnect switch (optional) Individually adjustable louvers to direct air flow as needed. Die-formed heavy gauge steel housing with attractive gray powder coat finish. Field installed summer fan switch (optional). Magnetic Contactors Standard Field installed thermostat with adjustment switch (optional). Electrical & Control Components The self-contained electrical and control features of the KUH simplify installation and ensure safe, long term operation. Heavy duty magnetic control contactors are standard on all models except single-phase 2.6 thru 5 kw models, which are standard without contactors for control by external line voltage thermostat. Optional contactors are also available for these models. All heaters with a total current draw of 48 Amps or greater have electrically balanced, subdivided circuits with individual fuse protection. The fuse compartment is conveniently located for easy access. An internal 24 volt control transformer, standard on 480V models, eliminates a need for an external control source. Horizontal type heaters mount on wall or ceiling. Recessed welded fasteners on top of housing are internally threaded for suspension of unit with threaded rods. Also there are optional ceiling and wall swivel mounting brackets. The ceiling bracket lets you mount the Horizontal Unit Heater direct to the ceiling or overhead member, simply and easily. The wall swivel mounting bracket makes for easy wall mounting. Swivel type mounting lets you readily adjust direction of warm air flow for optimum comfort, 180 degrees if need be. The Electric Heat Bank Chromalox patented metal sheath Fintube heating elements. Heat radiating fins are steel, furnace brazed to the tubular heating elements for good heat transfer. They don t come loose! Wide spacing minimizes clogging. Thermal overload cutouts open the control circuit and disconnect power to the heating elements if overheating occurs. Automatic reset allows the control circuit to reclose and restore power when the temperature falls to normal levels. Dynamically balanced fan for smooth, quiet running. Blade pitch is carefully selected so that the volume of air moved results in the optimum discharge air temperature. 2
3 Specifications And Ordering Information To order please specify kw, volts, phase, catalog number, PCN and quantity. See back page for control, thermostat and fan options. Electrical Data (60 Hz) Fan Motor Mounting Data Air Temp. Ph- Ph- Fan Velo. Rise Max. Hor. Catalog Sta- Wt. kw Volts Watts ase Amps BTU/H Volts ase RPM HP Dia. CFM F Ht. Throw No. tus* PCN lbs , , / KUH S / /240 2,000/2, *** 8, / KUH S , , / KUH S , , / KUH S , , / KUH S /4 208/240 3,000/4, *** 13, / KUH S /4 208/240 3,000/4, *** 13, / KUH S , , / KUH S , , / KUH S , , / KUH S , , / KUH S /5 208/240 3,750/5, *** 17, / KUH S /5 208/240 3,750/5, *** 17, / KUH S , , / KUH S , , / KUH S , , / KUH S , , / KUH S / /240 5,625/7, *** 25, / KUH S / /240 5,625/7, *** 25, / KUH S , , / KUH S , , / KUH S , , / KUH NS , , / KUH S , , / KUH S /10 208/240 7,500/10, *** 34, / KUH S /10 208/240 7,500/10, *** 34, / KUH S , , / KUH S , , / KUH NS , , / KUH S / /240 9,375/12, *** 42, / KUH S , , / KUH S , , / KUH NS , , / KUH S /15 208/240 11,250/15, *** 51, / KUH S , , / KUH S , , / KUH NS /240 15,000/20, *** 68, / KUH S , , / KUH S , ,460 ** / KUH NS , , / KUH S , ,525 ** / KUH NS , , / KUH S /240 22,500/30, *** 102, / KUH S , , / KUH S , ,390 ** / KUH NS /240 26,250/35, *** 119, / KUH S , , / KUH S , ,455 ** / KUH NS /240 30,000/40, *** 136, / KUH S , , / KUH S , ,520 ** / KUH NS , , / KUH S , ,585 ** / KUH NS * S = Stock; NS = Non-Stock ** Check factory for motor data *** 208V amperage is 86% of 240V value Notes: 1.All heaters have built-in contactors except 2.6 thru 5 kw Single Phase Models, and stock 480 volt models have built-in control transformers and contactor with 24 volt holding coils. All stock 208 and 240 volt models have 208/240 volt holding coils. All stock 277 volt models have 277 volt holding coils. 2.Optional contactors are available with 24 volt holding coils on made to order models. When total heater capacity exceeds 48 amps, built-in fusing is provided behind a hinged and latched door in the side which allows easy access. 3
4 Application Tips Small rooms can be heated by a one (1) unit heater. Where two (2) walls are exposed, heater should be mounted as shown. Large rooms require multi-unit installations. Number and capacity of units will be determined by volume of building and square feet of floor area to be heated. Arrange units to provide perimeter air circulation. To prevent air stratification, total CFM capacity of all units should circulate the room air volume at least 3 times per hour. Units should be located so their air streams wipe exposed walls without blowing directly at them. In multiple unit heater installations, locate units so each unit supports the air stream from another, thus setting up circulatory air movement. In warehouse type applications, for maintaining minimum temperature, one or more large heaters can be used to reduce initial installation expense. For individual spaces total heating capacity is calculated in the conventional way, using formulas in the ASHRAE Guide or those found in the NEMA handbook. For pedestrian entryways when heating capacity is not known, a rule of thumb is watts per door. Use 3000 watts per door for a low traffic single-door entry. For a large multiple-door entry, or a high traffic single-door entry, use 5000 watts per door. Loading Docks. Unit heaters are used to combat cold air inrush when loading dock doors are opened. For such applications, one or more units should be arranged to blow warm air across the opening, not toward it. Mounting Recommendations Hazardous Atmosphere - KUH Horizontal Unit heaters should not be used in potentially explosive atmospheres. Corrosive Atmosphere - The finish is not intended for direct salt spray exposure in marine applications or the highly corrosive atmosphere of greenhouses, swimming pools, chemical storage bins, etc. Mounting Height - Do not install heaters above recommended maximum mounting height. Obstructions - Must not block heater air inlet or discharge. Warning - This heater is not intended for use in hazardous atmospheres where flammable vapors, gases, liquids or other combustible atmospheres are present as defined in the National Electric Code. Failure to comply can result in explosion or fire. Suggested Engineering Specifications Furnish and install Chromalox type KUH Horizontal Unit Heaters with heating and air delivery capacities as shown on the heating schedule. Mounting brackets designed for either ceiling or wall swivel mounting shall be furnished as shown on the heating schedule. The cabinet shall be of 18 gauge die formed furniture grade steel. Individual adjustable louvers shall be furnished to provide desired control of discharge air. All metal surfaces of the casing shall be phosphate coated to resist corrosion, and finished in gray powder coated paint. The electric heating bank shall consist of our metal sheath Fintube heating elements. Automatic reset thermal overheat protection shall be wired for instantaneous pilot operation of built-in control contactor holding coil. Single phase units 2.6 thru 5kW shall have cutout wired in series with the motor and element. All heaters drawing more than 48 amperes shall have built-in branch circuit fusing for protection. Motors shall be of the totally enclosed continuous fan-duty sleeve bearing type equipped with built-in thermal overload protection. Each unit shall be equipped with a combination fan guard/motor support resiliently mounted at four points to absorb any motor vibration. Fans shall be aluminum, directly connected to fan motor, dynamically balanced and designed specifically for unit heater application. Optional control transformers shall be available to internally develop safer low voltage for pilot-duty control circuits. Fan switching devices shall be available to independently operate the fan motor for summer circulation and winter heat recovery. Individual optional built-in comfort control thermostat is integral or remote fan only switch and disconnect switch shall be available, for all models. All heaters should be UL Listed and CSA Certified and meet the requirements of the National Electrical Code. 4
5 Dimensions Minimum distance to wall Welded fasteners (4) for threaded rod** Mounting to overhead steel. Note: Heater must be mounted at least 7 above floor. * Fasteners for mounting bracket to ceiling or wall not supplied. ** Threaded rod not supplied. Wall line Minimum distance to wall with ceiling mount. Dimensions Inches Catalog Number A B C D Welded Fasteners E F G H I J K KUH-02 thru /8 8 7 / /16 5 / /4 9 3 /4 5 1 /2 4 1 / /2 4 1 /2 6 5 /8 KUH-07, 10, 12, / / / / / /4 4 1 /2 6 1 /4 6 1 /4 8 5 /8 KUH-20, / / /4 KUH-30, 35, 40, / /8 3 / / / /4 6 1 / / / / / /4 10 Ceiling Mounted One 11 /16 mounting hole for swivel mounting to ceiling. V U N M W Wall Wall Mounted Universal Bracket 4 13 /32 diameter mounting holes for fastening to wall.* Stop for limiting rotation. A Swivel bolt permits heater to be rotated to face desired direction. Four bolts are provided for field attachment of swivel bracket to welded fasteners on top of unit. Mounting Limitations Finished ceiling Ceiling must be smooth wood, plaster or metal surface with adequate strength to support heater. Not adaptable to acoustic tile or suspended ceilings. Swivel Mounting Bracket* Four bolts are provided for field attachment of swivel bracket to welded fasteners on top of unit. Hazardous Atmosphere Unit heaters should not be used in potentially explosive atmospheres. Corrosive Atmosphere The finish is not intended for direct salt spray exposure in marine applications or the highly corrosive atmospheres of greenhouses, swimming pools, chemical storage bins, etc. Mounting Height Do not install Unit Heaters above recommended maximum mounting height. Obstructions must not blockunit heater air inlet or discharge. Clearance Requirements Mounting Limitations Back To Wall Side To Wall Top To Wall 6 inches 6 inches 6 inches Ceiling Mounted Heaters Dimensions Inches Heater Model A M N U V W Ceiling Bracket Cat. # KUH-02 thru / / /2 BUH-04A KUH-07, 10, 12, / / /4 16 BUH-05A KUH-20, / / /2 BUH-05A KUH-30, 35, 40, /4 9 5 / /4 21 BUH-06A Wall Mounted Heaters Dimensions Inches Heater Model P Q R S T Wall Bracket Cat. # KUH-02 thru / /2 6 3 /4 5 5 / /2 BUH-01A KUH-07, 10, 12, / / /2 8 3 / /8 BUH-02A KUH-20, / / /2 8 3 / /8 BUH-02A KUH-30, 35, 40, / / / /16 BUH-03A 5
6 Optional Control Accessories and Remote Thermostats Thermostat Kits Catalog Number PCN KUH-TK3 (SPST) KUH-TK4 (DPST) Fan Only Operation Kits Power Disconnect Kits Summer Fan Switch Thermostat Kit 3 Pole, 600V Rating Catalog Number Rating PCN KDS-1 40 Amp KDS-2 80 Amp KDS Amp A fan only operation (optional) is available by means of a built-in switch or by external control. (2-15 kw) (20-45 kw) Catalog Number Description PCN PCN ISFS-02 Internal Summer Fan Switch ISFS through 277Volts ESFS-40 External* Summer Fan Switch ESFS-40A With Relay (24 Volt control) ESFS-42 External* Summer Fan Switch ESFS-42A With Relay (240 Volt control) ESFS-47 External* Summer Fan Switch With Relay (277 Volt control) *Kit includes wall plate (discard plate if switch is to be installed on the heater.) 6
7 Recommended Remote Wall Thermostats Industrial Rated NOT A FAIL-SAFE DEVICE Maximum Rating (Amps/Watts) AC DC DC Catalog Sta- 120V 240V 277V 480V 115V 230V Number tus PCN 25/ / / VA* 125VA** 125VA** WR-80 S / / / VA* 125VA** 125VA** WR-90 S *Pilot Duty (Use With AC Contactor) **Pilot Duty (Use With DC Contactor) DC Ratings Not UL Listed WR-80 SPST 40 F - 80 F UL Listed WR-90 SPST 20 F - 90 F UL Listed Light Duty NOT A FAIL-SAFE DEVICE Maximum Rating (Amps/Watts) AC Pilot duty Catalog Sta- 120V 208V 240V 277V (VA) Number tus PCN 22/ / / / WT-121 S / / / / WT-122 S Line Voltage WT-121 WT-122 SPST DPST 45 F - 75 F 45 F - 75 F Low Voltage WTL-121 SPST 40 F - 80 F 30 VAC 1 Amp Thermostat and Fan Switch NOT A FAIL-SAFE DEVICE Catalog Number Status PCN RTC-90 S Surface Mounting Box S Electrical Rating Inductive Pilot Duty Resistive VAC FLA LRA (VA) (Amps) RTC F - 90 F UL Listed 7
8 Model Numbers When ordering KUH heaters, specify the model number and corresponding PCN (Product Code Number). If controls or thermostat/fan options are required, designate these options in the model number when ordering, as shown below. Always specify voltage, phase and kw by listing them on the purchase order product specifications. KUH Disconnect Switch 1 40 Amp 2 80 Amp Amp Control 0 0 No Thermostat, No Summer Fan Switch 4 0 Internal Thermostat Only 4 1 Internal Therm. and Internal Sum. Fan Sw. 4 2 External Sum. Fan Sw. Only (Not 480V) 4 3 External Sum. Fan Sw. and Fan Relay (All Volts) 4 4 Rem. Fan Sw. and Internal Therm. (Not 480V) 4 5 Rem. Fan Sw., Fan Relay and Int. Therm. (All Volts) Control 0 0 No Contactor(s) V Control Internal Transformer V Control Externally Supplied /240V Control Internally Supplied, No Transformer V Control Internally Supplied Heating Elements 02 = 2.6 kw 04 = 4.0 kw 05 = 5.0 kw 07 = 7.5 kw 10 = 10.0 kw 12 = 12.5 kw 15 = 15.0 kw 20 = 20.0 kw 25 = 25.0 kw 30 = 30.0 kw 35 = 35.0 kw 40 = 40.0 kw 45 = 45.0 kw Heater Voltage and Phase 81 = 208V, 1 Phase 83 = 208V, 3 Phase 21 = 240V, 1 Phase 23 = 240V, 3 Phase 71 = 277V, 1 Phase 43 = 480V, 3 Phase 63 = 600V, 3 Phase Chromalox Horizontal Unit Heater 8 PF310-2 PDS KUH FEB05
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