REV 14MAY02 PN 168324 Heater, Tent Model UH68ODK, UH68ODH Manual for UH68G1 with Hunter Part Number 53100 Outdoor Kit Installed and UH68ODH, Part Number 168325 Hunter Manufacturing Company 30525 Aurora Rd Solon, OH, 44139 www.huntermfgco.
WARNING! FUEL WARNING Gasoline and JP-4 should NOT be used with the UH68OKD/ODH under any circumstance. Only JP-8 or an approved alternate fuel as detailed in Chapter 1. Failure to observe fuel requirements could cause damage to the heater assembly and injury or death to personnel within or around the tent and the heater assembly. Always place fuel can in well-ventilated area as far away from open flames and other potential ignition sources as possible.
ELECTRIC SHOCK Always disconnect power cable from heater before doing any type of service work or repairs. SEVERE BURNS HOT EXHAUST DO NOT MOVE THE HEATER ASSEMBLY WHILE ANY OF THE ADVISORY LIGHTS ARE LIT. Small, portable, shelter heaters of this type are not designed to be moved during operation or before purge cycles are complete. Serious injury, burns, or death can occur if the heater assembly is moved while operating, the HEAT LED is on, or the vent fan is still running.
UH68ODK Tent Heater Chapter 1 Introduction Scope Type of manual: Operators Model and Name: UH68ODK and UH68ODH, Forced air tent heater, with ducts. Purpose of Equipment: Circulates heated air in the Alaska, TEMPER tent, and other soft walled structures. Maintains temperature via room thermostat in the remote control panel. Control panel also has diagnostic and operating LED’s. General The UH68ODK is Hunter model UH68G1modified for outdoor usage.
UH68ODK Tent Heater Specifications Manufacturer Model Voltage Cycles Power Heat Output Air Flow Hunter Manufacturing UH68ODK 120 VAC 50-60Hz 400 watts 60,000 BTU nominal 650 CFM @ .5 IWC Back pressure **Fuel *DF2, DF1, DFA, JP8 Dry Weight 130 Lbs. * Heater is factory set on for DF2, adjustment to the carburetor is necessary for other fuels.
UH68 ODK/ODH Tent Heater Operators Instructions Chapter 2 Operating Instructions Operator Controls and Indicators 2 1 3 4 6 5 Table 2. Controls and Indicators Key Control or Indicator 1 Main Switch 2 3 4 Room Thermo Main Power LED (green) Standby LED (green) 5 Heat LED (green) 6 Fault LED (red) Function Starts and stops heater. FAN position turns fan only on for ventilation Set for desired temperature.
UH68 ODK/ODH Tent Heater Table 3. Blink Codes Number of Blinks Problem 1 Low voltage at AC input (< 100 VAC) 2 Reverse polarity at AC input 3 High voltage (>130 VAC) 4 Not used 5 PC Board over temp 6 Not used 7 Not used 8 Ignition Fault Lockout Note: Only the Ignition fault lockout will shut down the heater. Any other code will flash the red led, but still allow the heater to operate normally. 4 3 2 1 Table 4.
UH68 ODK/ODH Tent Heater Operators Instructions 5 6 4 3 2 1 Table 5. Key Description 1 Inlet Adapter 2 Storage compartment 3 Exhaust elbow 4 Stack support 5 Exhaust stack 6 PUDA Function Attachment point for return air duct Storage for stack, fuel lines, power cord etc.
UH68 ODK/ODH Tent Heater Operation Under Usual Conditions Setup Alaska Tent TEMPER Tent Completely setup the Alaska tent, and deploy the duct collars at the end in which you are to setup the heater. Make sure the generator or power supply is on line. Before setting up the tent and heater, some thought should be given to the orientation of the structures as to the prevailing wind direction. Try to orient the heater and shelter so the exhaust is blown down range away from doors and shelter openings.
UH68 ODK/ODH Tent Heater Operators Instructions 4 4 6 5 7 8 9 10 6 Return 7 Supply 12 2-5
UH68 ODK/ODH Tent Heater 7. Uncoil remote control (2) inside tent and feed through the collar with the return duct(5). Attach remote control (2) to heater. Make main sure switch is in the off position. 8. Attach power cable (3) to heater then plug in to power supply. The green, main power LED, on the remote panel should illuminate. 9. Check fuel in can(14), fill if necessary with authorized fuel (see section one). Attach Suction Feed Adapter(15) and open vent(16). 10.
UH68 ODK/ODH Tent Heater Operators Instructions 16 19 18 17 15 14 MAX DISTANCE 17 14 22 23 20 24 21 2-7
UH68 ODK/ODH Tent Heater Operating Procedures The UH68 ODK can be operated in either of two modes: a. Heating mode. b. Fan only mode. Heating Mode ! CAUTION Never operate the UH68 ODK with the pop up duct adapter closed. Damage to the internal parts may occur. 1. Set the room thermo (1) to the lowest detent setting. 2. Move main switch (2) to HEAT. The green standby LED (3) should illuminate 3. Rotate the room thermo until the green HEAT LED (4) illuminates.
UH68 ODK/ODH Tent Heater Operators Instructions Shutdown ! CAUTION Never disconnect power to the heater while heat exchanger is hot. Damage to the internal parts may occur. 1. Place main switch in off position. Vent fan will continue to run until heat exchanger has cooled down. The length of time will vary depending on ambient temperature. Operation Under Unusual Conditions Extreme Cold, Below 10oF There is a thermostatically controlled fuel heater in the carburetor block.
UH68 ODK/ODH Tent Heater Operation Under Rainy Conditions 1. The remote control panel is water-resistant. No special instructions for setting up in the rain. 2. Do not remove protective covers from the remote and power receptacles until ready to connect. 3. To keep rain water from collecting around heater, place heater on skid (1), bricks or small logs. Make sure heater is stable. 4. Paint all chipped and scratched surfaces to prevent rust 1 Strike Procedure 1. Drain fuel lines 1.
UH68 ODK/ODH Tent Heater Operators Instructions 1 2 2 1 4 3 5 7 6 5 6 2-11
UH68 ODK/ODH Tent Heater 4. Remove inlet duct collar (8) and stow in PUDA 5. Disconnect Remote Cable (9) coil up and stow in PUDA 6. Disconnect power cable (10), coil up and stow in PUDA. Close PUDA 7. Remove stack (11) and stow in storage compartment (13). Secure with spring hold down (12).* 8. Store fuel lines in storage compartment (13) 9. Fuel can adapter may be left on the fuel can. Make sure to close the air vent (17). Heater can now be transported. *Packing using duffle bag 1.
UH68 ODK/ODH Tent Heater Operators Instructions 9 10 8 11 11 14 15 12 13 16 14 14 11 16 17 2-13
UH68ODK Tent Heater Chapter 3 Maintenance Instructions Lubrication Instructions Doors, Pop Up Duct Adapter Lubricate all hinges with MIL-A-907 anti-seize compound. Preventative Maintenance Checks and Services (PMCS) Systematic, periodic PMCS are essential to ensure that the heater is ready for operation at all times.
UH68ODK Tent Heater PMCS Procedures 1.1 Fuel Line System - check all fuel lines and fittings for leaks. Make sure vent at top Suction Feed Adapter is clear of ice and snow. 1.2 Exhaust stack - make sure exhaust stack is clear of ice and snow. Check for damage or anything that might obstruct the flow of exhaust gas. 1.3 Fuel Supply – before filling, check for water or dirt at the bottom of the can. Fill can before operation. Heater will operate for about 9 hours with full can.
UH68ODK Tent Heater Cleaning, burner head 1. Remove Carb mixer assembly 2. Remove Igniter 3. Clean carbon deposits in this area. Use a small wire brush. 4. Clean these areas using compressed air. CAUTION: Wear appropriate eye protection when performing this operation 5. Finish up with solvent wash commonly used in parts cleaning stations or carb cleaner. Let dry before assembly.
UH68ODK Tent Heater Cleaning, Mixer 1. Remove mixer from carb assembly Caution: The mixer assembly is made of brass and can be scratched or dented very easily. Great care must be taken not damage the mixer nozzle. The performance of your heater depends on this delicate part. 2. Soak mixer in solvent bath for an hour or so to loosen up carbon deposits. 3. With a flashlight look for dirt or carbon here. Dirt may be blown out using compressed air.
UH68ODK Tent Heater Reassembly * IMPORTANT The mixer assembly must be seated correctly to insure that your heater has good combustion. Figure 1 shows the mixer assembly properly seated in the burner head. ( carburetor not shown for clarity) Figure 1 Figure 2 shows the mixer incorrectly seated. If left in this position combustion air will leak past the mixer and cause poor combustion and hard starting.
UH68ODK Tent Heater 1.10 Igniter – Check igniter for carbon build up and signs of wear. As the igniter wears the gap between 1. and 2. will become wider and oval shaped. Replace when signs of wear are evident. 1.11 Fuel Pump – the fuel pump has a filter screen located at the inlet end. To clean remove three screws holding the cap on, remove the cap being careful not to tear the gasket, and remove the filter screen. Pay close attention to the orientation or the filter screen in the pump foe reassembly.
UH68ODK Tent Heater 3-7
UH68ODK Tent Heater Chapter 4 Troubleshooting General This section contains information for locating and correcting most operating problems. This manual can not list all that may occur. When performing trouble shooting procedures, follow all warnings and safety procedures. At no time does this manual supercede good common sense. Sequence of Operation 1. Move main switch to HEAT. The green standby LED should illuminate 2.
UH68ODK Tent Heater Note on Blink Codes Only the ignition fault will stop heater operation. The other flash codes will be displayed but the heater will continue to operate. Troubleshooting Procedures Electrical Schematic 0.1uF U5 R10 6 1 180 VENT FAN M2 R8 38 J6 1 2 180 U8 5 G 4 M1 CONN-H2 0.01uF 1 2 3 4 5 6 3 MOC3031 1K CARB HTR 6 1 U7 5 2 G 4 180 J5 M2 R6 1 2 38 1 2 3 4 5 6 SW-SP-ON-OFF-ON D9 R19 150 CONN-H6 CONN-H6 U4 R11 LED SW1 J10 J12 D8 R9 D12 0.
UH68ODK Tent Heater Troubleshooting Procedures 1.1 Fuel Supply – See PMCS 1.2 Check Flame Switch – the flame switch is a normally open heat sensitive switch. The UH68G has two switches. As used in the 68 outdoor kit, only the normally open switch is active. Normally switch 1, red and brown wires, is used. The other switch is normally open and is not used. 1.3 Check Fuel Pump – The fuel pump operates on 24vdc. Energize the pump and listen for operation. Remove outlet connector and check for fuel flow.