Hunter Fan UH68ODK, UH68ODH User Manual

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.com

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. Fuel spills shall be
cleaned up in accordance with local requirements.
Always switch heater to the OFF position and wait until the vent fan is off before
refueling.

EXPLOSION HAZARD

FUEL LEAKS

Do not operate heater if fuel leak is detected.

DEATH OR SERIOUS INJURY

CARBON MONOXIDE

Carbon monoxide is without color or smell, but can kill you. Breathing carbon
monoxide produces symptoms of headache, dizziness, loss of muscular control,
a sleepy feeling, and coma. Brain damage or death can result from heavy
exposure. Carbon monoxide occurs in the exhaust fumes of fuel-burning heaters
and internal combustion engines. Carbon monoxide can become dangerously
concentrated under conditions of no ventilation.
Precautions must be followed to ensure operator’s safety when the Space
Heater, Convective is in operation.

• DO NOT operate Heater in an enclosed area without proper ventilation.

• BE ALERT at all times during operating procedures for carbon monoxide

poisoning. If symptoms are present, IMMEDIATELY evacuate personnel
to fresh air.

• BE AWARE the field protection mask used for nuclear-biological­chemical attack WILL NOT protect you from carbon monoxide
poisoning.

THE BEST DEFENSE AGAINST CARBON MONOXIDE POISONING IS GOOD
VENTILATION.

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.

During operation, some metal components of the heater assembly, such as the
outlet duct, the Pop Up Duct Adapter, combustion exhaust pipe, etc., can cause
severe burn injuries if contact with bare skin occurs.

During heater operation, air leaving the HEATED AIR OUTLET of the heater and
passing through outlet duct may exceed 220°F. Make sure tent personnel are
aware of burn hazards and equipment hazards presented by the heated air.

Combustible material must be kept at least 2 feet away from the sides of the
heater during operation.

Do not attempt service procedures on a burner that has recently been in
operation. Let the burner cool down before performing these procedures to avoid
the possibility of serious burns. Never touch the exhaust stack while heater is
operating. Surface temperatures can exceed 800 degrees F. Allow sufficient time
for heater to cool before removing exhaust stack. The exhaust elbow will remain
hot for several minutes after the heater has shut down.

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. The outdoor kit
may be field installed or factory installed. The UH68ODK burns all grades of diesel fuel
and JP8 to generate heated air. Fuel is pumped from remote tank to the carburetor,
drawn through the fuel jet by venturi action of the mixer nozzle, ignited, and burned in
the heat exchanger. A fan, capable of delivering up to 2 IWC static pressure, blows the
heated air into the tent. The UH68ODK has the following applications:

• Alaska tent, Temper Tent

• Medium and small soft wall shelters

Features

• Variable room temperature control

• Remote control with 20 foot cable

• Diagnostic LED’s on remote control

• Low voltage opto-isolated controls to eliminate shock hazard.

• “Fan only” ventilation.

UH68ODK Tent Heater

Chapter 1

Introduction

WARNING!

ELECTRICAL SHOCK

Attempting to use an unmodified UH68 series heater outdoors

may result in electrical shock, injury or death

1-1

UH68ODK Tent Heater

Specifications

Manufacturer Hunter Manufacturing
Model UH68ODK
Voltage 120 VAC
Cycles 50-60Hz
Power 400 watts
Heat Output 60,000 BTU nominal
Air Flow 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.
** Gasoline or MOGAS is not recommended for use on the UH68ODK

Environmental

Temperature Range -65 to 120 F
Elevation 10,000 feet MSL

Authorized Fuels

NOTE: HUNTER MFG DOES NOT RECOMMEND THE USE OF

GASOLINE OR MOGAS, or JP4

Ambient Temperature Specification Military Symbol

Above +20°F (-6,7°C) VV-F-800 DF-2
Above -25°F (-33.3°C) VV-F-800 DF-1
Above -25°F (-33.3°C) MIL-T-83 133 JP-5
Above -60°F(-51.l°C) VV-F-800 DF-A
Above-60°F(-51.1°C) MIL-T-83133 JP-8

1-2

UH68 ODK/ODH Tent Heater

Operators Instructions

Chapter 2

Operating Instructions

Operator Controls and Indicators

3

4

Table 2. Controls and Indicators
Key Control or Indicator Function

1 Main Switch Starts and stops heater. FAN position turns fan only on
2 Room Thermo Set for desired temperature. *

3 Main Power LED (green) Indicates heater is plugged in to AC power
4 Standby LED (green) Indicates main switch is ON but room thermo is not

5 Heat LED (green) Indicates main switch is ON and combustion system is
6 Fault LED (red) Blinks a diagnostic code for corresponding fault. (see

* Heat output is constant. Raising room thermo setting does not heat shelter faster.

5

2

1

6

for ventilation

calling for heat
energized
fault codes table 3)

2-1

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.

Table 4.
Key Connection / Fitting Function

1 Power Receptacle Connection for power cable
2 Remote Control Receptacle Connection for remote control
3 Fuel Inlet QD fitting for fuel supply
4 Fuel Overflow QD fitting for fuel overflow

4

3

2

1

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UH68 ODK/ODH Tent Heater

Operators Instructions

Table 5.
Key Description Function

1 Inlet Adapter Attachment point for return air duct
2 Storage compartment Storage for stack, fuel lines, power cord etc.
3 Exhaust elbow Exhaust stack rests on top
4 Stack support Holds exhaust stack securely
5 Exhaust stack Double wall exhaust stack for extra safety
6 PUDA Pop Up Duct Adapter, attachm ent poin t for su pply duct

4

2

5

3

1

6

2-3