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2-506.14

GENERAL MAINTENANCE

General Maintenance

Unit heaters, like other electrical and mechanical equipment, 

will give lasting trouble-free service if properly cared for. 

Observance of a few simple periodic procedures will insure their 

satisfactory operation.

Under average conditions, it is recommended that unit heaters 

be inspected before every heating season.. more often in 

locations where air is contaminated with corrosive fumes, dust, 

soot, or oil spray. To perform routine maintenance:

1.  Disconnect power supply to the unit.

2.  Open junction box doors at top of unit and inspect unit 

contactors, fuses, transformer, and tighten connections if 

necessary.

3.  Open side terminal box by removing panel at side of unit and 

check element connections and the over-heat control switch.

4.  Check motor mounting from bottom of unit. Check fan for 

proper clearance, free rotation, and firm connection to motor 

shaft. Remove air deflectors (if provided) for access.

5.  Lubricate motor according to manufacturer’s instructions 

on motor. When no instructions are on motor, oil every 

two thousand hours of operation with SAE20 oil for 

normal applications. Adjust oiling according to usage and 

atmosphere. Some motors do not have oil fitting. These are 

lubricated for long life and do not require further lubrication.

6.  Routine cleaning of the outer unit casing and protective 

screen is recommended to remove dirt, grease, or corrosive 

material that may damage finish. Rusted or corroded spots 

on top or bottom casing should be sanded and repainted.

7.  Clean fan blades, elements, and inside casing with either 

a detergent solution or compressed air. Do not scrape 

elements.

8.  For better element access or for more extensive cleaning of 

the elements and screen, the screen can be easily removed. 

Detach side terminal box cover and casing bottom before 

removing protective screen.

10

WARNING

1.  When servicing or repairing this equipment, use only 

factory approved service replacement parts. A complete 

replacement parts list may be obtained by contacting 

Modine Manufacturing Company. Refer to the rating  

plate on the unit for complete unit substitution of parts  

or controls not approved by the factory will be at the 

owner’s risk.

2.  Do not operate any heater if it malfunctions. Disconnect 

power at service panel and have heater inspected by a 

qualified installation and service agency.

CAUTION

Do not reuse any electrical component which has been wet.

Such component must be replaced.

NOTE: To check most of the Possible Remedies in the 

trouble-shooting guide listed in Table 11.1, refer to the 

applicable sections of the manual.

Summary of Contents for PTE

Page 1: ...at installer s risk For replacement parts submit the unit heater model number power code control code and serial number shown on the rating plate attached to the unit Do not remove outlet fan guard from vertical electric unit heaters except to service the unit Contents General Information 1 Installation Special Precautions Important Instructions 2 Unit Locations 3 Ceiling Suspension 4 5 Wall Mount...

Page 2: ...pany Refer to the rating plate on the appliance for complete appliance model number serial number and company address Any substitution of parts or controls not approved by the factory will be at the owner s risk 5 Do not operate any heater if it malfunctions Disconnect power at service panel and have heater inspected by a qualified installation and service agency CAUTION 1 All literature shipped w...

Page 3: ...above which the unit will not deliver heated air to the floor The maximum mounting heights must not be exceeded in order to assure maximum comfort WITH CONE JET WITHOUT DEFLECTOR S H S S H H T T H H S H WITH LOUVERS WITH TRUNCONE Figure 3 3 Vertical Delivery Heat Spread Throw Unit Mounting CAUTION 1 Do not install VE type unit heaters closer than 18 inches from ceiling and 24 inches horizontally f...

Page 4: ...capscrews to facilitate threaded pipe suspension Two kits are required to pipe mount a vertical unit Kit is not available on 480 volt models VE50 thru VE250 with transformer junction box INSTALLATION Figure 4 4 Ceiling mounted Model PTE Figure 4 1 Vertical Model VE with Cone Jet Accessory Installed ANGLE BRACKET FASTENING Figure 4 2 Horizontal Delivery with Louver Deflectors Models PTE300 PTE400 P...

Page 5: ... bracket saves installation time has a built in wall clearance and provides an inexpensive and convenient wall mounting method The one point suspension shown above permits swiveling the unit 180 degrees horizontally for most effective air direction Refer to separate bulletin included in the kit for bracket assembly and installation Refer to Figure 4 2 for maximum mounting heights Minimum mounting ...

Page 6: ...EARANCES AT LEAST 18 FROM CEILING AND 24 HORIZONTALLY FROM NEAREST ENCLOSURE 7 8 DIA FOR CONTROL WIRING 4 MTG HOLES 1 2 13 N C TAP Figure 6 2 Outline Dimensions PTE Models 12 18 24 24 MIN CEILING WALL 5 18 MIN 6 25 3 8 34 7 8 20 5 8 8 5 8 5 3 4 7 8 OPENING FOR CONTROL WIRING HANGER BRACKET 4 PROVIDED 4 MTG HOLES FRONT AND REAR 5 8 DIA 1 3 8 OPENING FOR POWER SUPPLY Table 6 3 Motor Specifications T...

Page 7: ...t The unit may also be controlled by a remote manual on off switch Control wiring should be No 14 AWG American Wire Gauge Total line amperes in Table 8 1 includes fan motor and element current FLA Refer to Table 6 3 for motor current draw All 480 volt three phase units have built in transformers and fuses to stepdown voltage and protect motor and control circuit Fuse blocks with fuses are factory ...

Page 8: ...so provide closer temperature control Models VE and PTE 300 400 500 cannot operate in two stages with this control and a low voltage thermostat but will respond with full operation of all elements OVERHEAT CONTROL ELEMENT CONNECTION Model Volume VE50 thru 100 3 029 cm3 VE150 thru 250 2 883 cm3 VE PTE300 thru 500 9 570 cm3 JUNCTION BOX POWER SUPPLY OPENING THERMOSTAT WIRING OPENING Table 8 2 Power ...

Page 9: ... switch will permit the motor to continue operation and cool the heater while power to the elements is interrupted This overheat control should operate only when something is seriously wrong with the unit When this control operates correct the difficulty immediately or serious and permanent damage may result The motor for the circulating air fan has internal thermal overload protection If for any ...

Page 10: ...not have oil fitting These are lubricated for long life and do not require further lubrication 6 Routine cleaning of the outer unit casing and protective screen is recommended to remove dirt grease or corrosive material that may damage finish Rusted or corroded spots on top or bottom casing should be sanded and repainted 7 Clean fan blades elements and inside casing with either a detergent solutio...

Page 11: ...ing and connections check continuity through control Replace if necessary 2 Summer winter switch in 2 Change switch position summer position 3 Defective or incorrect wiring 3 Check all wiring and connections See diagram inside junction box 4 Blown element fuses 4 Replace element fuses Elements heat but fan 1 Fan motor failure 1 a Check for loose electrical connections does not operate Check wiring...

Page 12: ...D IN HIGH HUMIDITY APPLICATIONS AND UTILIZING STAINLESS STEEL HEAT EXCHANGERS BUYER S REMEDY FOR BREACH AS LIMITED HEREIN SHALL BE LIMITED TO TEN YEARS FROM DATE OF SHIPMENT FROM SELLER These warranties are issued only to the original owner user and cannot be transferred or assigned No provision is made in these warranties for any labor allowance or field labor participation Seller will not honor ...

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