Clarke GRH35 Instruction Manual

OPERATION & MAINTENANCE
INSTRUCTIONS
ORIGINAL INSTRUCTIONS GC0718 - Issue 9
PROPANE GAS HEATER
MODEL NO: GRH35
PART NO: 6920016

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INTRODUCTION
Thank you for purchasing this CLARKE Gas Heater. designed for industrial use
only, i.e. NOT for domestic use.
This portable gas heater is designed to BS 4096 for industrial applications, to
give safe, efficient and reliable operation, and is for use with Propane Gas
only. Propane gas bottles are not supplied with the unit, but are readily
available from builders merchants or gas suppliers.
As with all mechanical equipment, optimum performance will only be
achieved if the correct application and servicing procedures are followed.
Before attempting to use this product, please read this manual thoroughly and
follow the instructions carefully. In doing so you will ensure the safety of yourself
and that of others around you, and you can look forward to your purchase
giving you long and satisfactory service.
Proper combustion depends upon the air flow; therefore, the heater must not
be modified or operated with parts removed or missing. Likewise, safety
systems must not be circumvented or modified in order to operate the heater.
FUNCTION AND OPERATING PARAMETERS
This is gas powered heater. It’s intended use is for drying and the warming of
commercial/industrial buildings where adequate ventilation is provided.
• It must be operated as prescribed in the operating manual.
• Is not intended to be used for domestic use or for the heating of
habitable areas.
• Is not intended to be used to reach and maintain a certain level of
human thermal comfort within an enclosed space in which the heater is
situated.
• Is not intended to be used in enclosed areas with restricted ventilation.
• Is not for use in areas with high levels of fluctuating drafts.
• Is not intended for warming animals or live stock.

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THE FOLLOWING TABLE ADDRESSES THE INFORMATION
REQUIREMENTS OF REG.2015/1188
Item Symbol Value Unit
Fuel
LPG butane Gaseous 28 [mg/kWhinput] (GCV)
Space Heating Emission(*) NoX
Indirect heating fuctionality: [yes/no] No
Heat Output
At nominal heat output Pnom 4.2 kW
At minimum heat output (indicative) Pnom 1.55 kW
Auxiliary electricity consumption
At nominal heat output elmax N/A kW
At minimum heat output el min N/A kW
In standby mode elSB 0kW
Useful Efficiency (NCV)
At nominal heat output nth, nom 91 %
At minimum heat output nth, nom N/A %
Type of heat output/room temperature control (select one)
Single stage heat output, no temperature control No
Two or more manual stages, no temperature control Yes
With mechanical thermostat temp control No
With electronic temperature control No
Electronic temperature control with day timer No
Electronic temperature control with week timer No
Other control options (multiple selections possible)
Room temperature control with presence detection No
Room temperature control with open window detection No
Room temperature control with distance control option No
Room temperature control with adaptive start control No
Room temperature control with working time limitation No
Room temperature control with black bulb sensor No

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GENERAL SAFETY PRECAUTIONS
Read, and make sure you fully understand the following precautions and the
hazards associated with this type of equipment.
1. Check the heater thoroughly for damage. DO NOT operate a damaged
heater.
2. DO NOT modify the heater or operate a heater which has been modified
from its original condition.
3. Use only propane gas.
4. Use only VAPOUR WITHDRAWAL propane supply. If there is any question
about vapour withdrawal, ask your propane dealer.
5. Mount the propane cylinders vertically (shut-off valve up). Secure them
from falling or being knocked over and protect them from damage.
6. Locate propane containers at least 6ft from the heater and do not direct
the exhaust toward containers.
7. IMPORTANT: Use only the hose and regulator assembly provided with the
heater. Inspect the hose assembly before each use of the heater. If there is
excessive abrasion or wear, or hose is cut, replace with the hose assembly
listed on the parts list before using the heater.
8. Not to be used for the heating of habitable areas of domestic premises; for
use in public buildings, refer to national regulations.
9. For indoor use only in well ventilated areas.
10. If at any time gas odor is detected, IMMEDIATELY STOP operation until the
source of gas has been located and corrected.
11. Install the heater such that it is not directly exposed to water spray, rain
and/or dripping water.
12. Maintain minimum clearance from normal combustible material (e.g. like
paper) stated on page 4.
13. Due to the high surface and exhaust temperatures, adults and children
must observe sufficient clearances to avoid burns or clothing ignition.
14. Operate only on a stable, level surface.
15. Do not use with duct work. Do not restrict air inlet or exit.
16. Do not move, handle or service while hot or burning.
17. Use only in accordance with local codes
18. Do not place torsional stress on any hoses.

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MINIMUM FRESH AIR OPENING REQUIREMENTS
• Do not use in unventilated areas.
• The flow of combustion and ventilation air must not be obstructed.
MINIMUM CLEARANCES FROM COMBUSTIBLES
RISKS OF CARBON MONOXIDE POISONING
Even though this heater operates very close to 100 percent combustion
efficiency, it still produces small amounts of carbon monoxide.
• Carbon Monoxide (CO) is toxic.
• Pregnant women, persons with a heart or lung condition, anaemia
or under the influence of alcohol, or those at high altitude, are more
likely to be effected by Carbon Monoxide.
• CO can build up in a confined space and failure to provide
adequate ventilation can be fatal.
The early symptoms of asphyxiation caused by inadequate ventilation are:
Should anyone show these symptoms, they must GET FRESH AIR IMMEDIATELY.
Turn off the heater and have it serviced before using again.
Be sure to follow all warnings in this manual.
WE RECOMMEND THE USE OF A CARBON MONOXIDE
DETECTOR
Warning: PROVIDE AT LEAST 3FT2OPENING OF FRESH, OUTSIDE AIR WHILST
RUNNING THIS HEATER. IF PROPER FRESH OUTSIDE AIR VENTILATION IS NOT
PROVIDED, CARBON MONOXIDE POISONING CAN OCCUR.
Front 8 Ft Top 4 Ft
Sides 4 Ft
• headache • nausea
• dizziness • dry mouth or sore throat

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IF YOU SMELL GAS
LP gas and natural gas have man-made
odorants added specifically for detection
of fuel gas leaks.
If a gas leak occurs you should be able to
smell the fuel gas. Since Propane (LP) is
heavier than air you should smell for the
gas odour near to the floor. ANY GAS
ODOUR IS YOUR SIGNAL TO GO INTO
IMMEDIATE ACTION!
1. Do not take any action that could
ignite the fuel gas. Do not operate
any electrical switches. Do not pull
any power supply or extension cables.
Do not light matches or any other
source of flame. Do not use your
telephone.
2. Get everyone out of the building and
away from the area immediately.
3. Close all propane (LP) gas tank or
cylinder fuel supply valves, or the main
fuel supply valve located at the meter
if you use natural gas.
4. Propane (LP) gas is heavier than air
and may settle in low areas. When you
have reason to suspect a propane
leak, keep out of all low areas.
5. Use your neighbours phone and call
your fuel gas supplier and your fire
department. Do not re-enter the
building or area.
6. Stay out of the building and away
from the area until declared safe by
the firefighters and your fuel gas
supplier.
7. FINALLY. let the fuel gas service person
and the firefighters check for escaped
gas. Have them ventilate the building
and area before you return. Properly
trained service people must repair any
leaks, check for further leakages. and
then re light the appliance for you.
8. If you smell even a small amount of
gas, CONTACT YOUR FUEL GAS
SUPPLIER IMMEDIATELY. DO NOT WAIT!
NO ODOUR DETECTED
1. Some people cannot smell the odour
added to propane (LP) or natural gas.
You must determine if you can smell
the odourant in these fuel gases.
2. Learn to recognize the odour of
propane (LP) gas and natural gas.
Local propane (LP) gas dealers will be
more than happy to give you a
scratch and sniff pamphlet. Use it to
become familiar with the fuel gas
odour.
3. Smoking can decrease your ability to
smell. Being around an odour for a
period of time can affect your
sensitivity to that particular odour.
odours present in animal confinement
buildings can mask fuel gas odour.
ODOUR FADING
1. The odourant in propane (LP) gas and
natural gas is colorless and the
intensity of its odour can fade under
some circumstances.
2. If there is an underground leak, the
movement of gas through the soil can
filter the odourant.
3. Propane (LP) gas odour may differ in
intensity at different levels. Since
Propane (LP) gas is heavier than air,
there may be more odour at lower
levels.
4. Always be sensitive to the slightest gas
odour. If you continue to detect any
gas odour, no matter how small, treat
it as a serious leak.
CRITICAL POINTS TO REMEMBER!
1. Propane (LP) gas has a distinctive
odour. Learn to recognize the odours.
2. A periodic sniff test around the joints;
i.e. hose, connections. etc., is a good
safety practice under any conditions.

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FEATURES OF THE GRH35
Understanding the basic operation of the heater will reinforce the need to
maintain the unit in top condition at all times whilst always observing the safety
precautions.
The heater comprises three basic systems:
1. The gas system. 2. The ignition system. 3. The safety control system.
GAS SYSTEM
The gas supply to the machine is by means of a high pressure hose,
connected to a LPG cylinder, via a pressure regulator.
When the gas valve is opened, gas will flow to the Control Valve and finally the
burner.
This heaters is designed for use with PROPANE gas ONLY. Gas bottles are not
supplied, but are readily available from builders merchants or gas suppliers
etc.
This heater is designed to operate with a minimum 20 pound (9 kg) propane
tank. You may need two or more tanks or one larger tank in colder weather.
Use a 100 pound (45 kg) tank for longer operation or in very cold weather. Less
gas is vaporized at lower temperatures. Your local propane gas dealer will
help you select the proper supply system. The minimum surrounding air
temperature rating for each heater is -20oF (-29oC).
IGNITION SYSTEM
A Piezo-electric igniter is positioned at the burner head. When the Igniter
button is depressed, a high intensity spark is generated, which ignites the gas.
Heat from the flame is sensed by a thermocouple, which is connected to the
Flame Failure Valve. As the thermocouple heats up the cut-off valve opens, so
that after a short period, the Control Valve button (see Operation) may be
released and the main flame is established.
THE SAFETY CONTROL SYSTEM
Should the flame extinguish for any reason, the Thermocouple will quickly cool,
causing the Flame Failure Valve to close, shutting off the gas supply.
Additionally, the machine is fitted with a ‘Tip Over Switch’, which operates
should the heater be moved from the vertical position i.e. tip over, thereby
shutting off the gas.
ALWAYS ensure that the Tip-Over switch is perfectly vertical and secure.

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INSTALLATION
Read these instructions carefully. Do not allow anyone who has not read these
instructions to light, adjust, or operate this heater.
Do not attempt to operate the heater with any gas other than propane.
This heater, including hose and regulator assembly, must be inspected at least
annually by a qualified service person. If the hose shows evidence of
excessive abrasion or wear or if the hose is cut, it must be replaced prior to the
heater being put into operation. The replacement hose assembly shall be that
specified by the Clarke International.
UNPACKING
1. Remove heater from carton.
2. Remove all protective material which may have been applied to the
heater for shipment.
3. Check the heater for possible shipping damage. Should any damage be
apparent, please notify your Clarke dealer immediately.
LOCATING THE HEATER
Although this heater incorporates a ‘tip-over’ switch, the heater and propane
gas cylinder must be located on a hard, flat, level surface to minimize the risk
of accidental tipping. The propane gas cylinder should be adequately
restrained to prevent accidental tipping. Only operate this heater with the
supply cylinder in the upright position.
This appliance must be installed only in locations where the potential for
physical damage to the appliance, or to individuals (burns), is reduced to a
minimum.
The heater must be installed in a location such that it will not be exposed
directly to water spray, rain and/or dripping water.
Use of this heater in a draft/windy area decreases its efficiency. If possible,
operate the unit in a draft free area.
The heater must be located at least 6 feet away from the propane cylinder
and must not be directed towards any gas cylinder.
If more than one heater is to be used, they and the supply cylinders must be
separated by at least 20 feet.
Position the heater at a safe distance from combustible materials.
This heater must not be placed on wooden floors or other combustible
materials.

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When used, the heater should rest on suitable insulating material at least 1
inch thick and extending 3 ft. or more beyond the heater in all directions.
GAS CONNECTION
The hose for connecting the heater to the gas bottles is supplied loose and
must be fitted by the user. Ensure the connection is tight. Do not use PTFE tape.
The connection to a propane cylinder must be made in a well ventilated area
using the regulator and hose assembly supplied with the appliance. DO NOT
attempt to adjust this regulator. It has been preset at the factory to provide
safe and proper operation of the appliance.
Attach the regulator to the gas cylinder ensuring the cylinder orifice is
perfectly clean - blow out with compressed air if necessary, or open the gas
valve quickly and briefly to blast away any dust or dirt. Turn the nut in an
anticlockwise direction - i.e. LEFT HAND THREAD, until tight. DO NOT use a
thread compound on threads. To check for leaks, use soapy water, or liquid
soap ONLY.
IMPORTANT: The gas hose and
cylinder must ALWAYS be located
behind the machine - at a distance
of at least 6 feet.
In order to reduce the risk of icing
up, when operating at long periods
of maximum capacity, you should
use a larger capacity gas bottle or
two/three bottles in parallel, as
shown.
The tee piece and ‘pigtails’ are
readily available from builders
merchants or gas suppliers.
Open the cylinder's gas valve and check all gas connections with a soap and
water solution. DO NOT USE A FLAME.
Always use full cylinders with good air circulation and no frost on the cylinders.
WARNING: Propane Gas cylinders must be used and stored in
accordance with the ‘HIGHLY FLAMMABLE LIQUIDS AND LIQUEFIED
PETROLEUM GASES REGULATIONS 1972.
WARNING: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss
of life.

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OPERATING INSTRUCTIONS
FIRST USE
The heater reaches a very high temperature and during first use you may
notice an odour coming from the heater - this is quite normal and will disperse
quickly (It is recommended the heater is initially run outside to enable the
odour to clear).
It should also be noted that the paint on the surface of the heater will
discolour due to the heat being produced.
LIGHTING THE HEATER
1. Ensuring there is sufficient gas, and that it is correctly connected and leak
free, turn on the gas supply and check all fittings and connections for gas
leaks using a mild soap and water solution. NEVER use a match to check
for gas leaks. When satisfied, open the valve on the gas cylinder.
NOTE: The heater, has a fixed, regulated gas flow.
2. Press and hold the control valve
plunge as shown whilst continually
pressing the piezo-electric button
until the burner ignites.
• Once the burner ignites, keep
the button pressed for one (1)
minute or until the burner stays
lit after it is released.
WARNING: DO NOT FACE THE HEATER
ELEMENT WHEN STARTING - ALWAYS
STAND TO ONE SIDE.
NOTE: If a new gas cylinder has been
connected, it may take some
time for the gas line to be
purged of air. Press the Piezo
electric button every10-15
seconds until it ignites.
3. Alternatively, hold a lit taper to
the burner face while pressing and holding the control valve button. After
WARNING: BEFORE STARTING THE HEATER, YOU MUST ENSURE THAT THE
MINIMUM VENTILATION REQUIREMENTS ARE OBSERVED TO AVOID THE
RISK OF CARBON MONOXIDE POISONING.

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the burner ignites, keep button pressed for one (1) minute or until the
burner stays lit after releasing button.
WARNING: WHEN LIGHTING THE BURNER WITH A TAPER, LIGHT AT THE BOTTOM OF
THE SCREEN, NOT AT THE ORIFICE.
NOTE: In cases where long runs of gas supply lines have been installed ahead
of the appliance, it may be necessary to bleed trapped air out of
supply lines before lighting pilot. New installations generally require
bleed of supply lines. Wait a minimum of five minutes after bleeding
supply lines before attempting to light heater.
SHUTTING OFF THE HEATER
1. Close propane gas supply cylinder valve.
2. Observe the burner until flame is extinguished.
3. Listen for closure of the safety valve.
4. DO NOT re-open the propane gas supply cylinder valve before the safety
valve closes.
CAUTION: THIS APPLIANCE IS HOT DURING NORMAL OPERATION. AVOID
PHYSICAL CONTACT. DO NOT PLACE CLOTHING OR OTHER
COMBUSTIBLE MATERIALS ON THIS APPLIANCE.

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CLEANING & MAINTENANCE
1. Turn heater off and let it cool for at least 20 minutes before cleaning.
2. Keep the heater clean. Clean the heater annually or as needed to remove
dust and debris. If the heater is dirty or dusty, clean with a damp cloth. Use
household cleaners on difficult spots. To clean the reflector, remove the
screen by undoing the four securing screws at the front of the unit.
3. Inspect the heater before each use. Check the connections for leaks.
Apply a mixture of liquid soap and water to the connections. Bubbles
forming show a leak. Correct all leaks at once.
4. Clean the inside of the heater using compressed air where possible. Blow
air back and forth along the entire burner face until all dust has been
dislodged from the surface of the screen. Blow air through the venturi from
the control (orifice) end of the heater.
5. Inspect the hose/regulator assembly before each use. If the hose is highly
worn or cut it must be replaced.
6. The heater should be inspected before each use and at least annually by
a qualified person.
WARNING: NEVER ATTEMPT TO SERVICE THE HEATER WHILE IT IS
CONNECTED TO THE PROPANE SUPPLY, IS OPERATING, OR IS HOT.
(SEVERE BURNS CAN OCCUR).

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TROUBLESHOOTING
Fault Cause Remedy
Burner fails to light 1. Gas supply valve
closed.
2. Excess-flow check
valve.
3. Excess-flow check
valve.
4. Piezo ignition not
sparking.
1. Open gas supply valve slowly
2. Close propane supply valve
closed propane tank and re-
open slowly.
3. Replace burner orifice.
4. Check igniter electrode gap is
5.0 mm (0.195 in). Check wire
lead for damage Replace
piezo igniter and/or igniter
electrode as necessary. Do
not bend electrode, this may
cause breakage.
No gas flow to the
burner.
1. Cylinder gas tap
closed.
2. Cylinder is empty.
3. Orifice is obstructed.
4. Gas leaks from the
supply hose or from
the tap.
5. Low gas pressure.
6. Thermocouple loose
or needs to be
replaced
7. Automatic control
valve needs to be
replaced.
8. Loose wires on tip over
switch.
9. Loose or broken wire.
10.Loose/mis-located
thermocouple.
11.Defective thermo
-couple.
12.Defective control.
1. Open the gas tap
2. Replace cylinder.
3. Remove the orifice and clean
it.
4. Use soapy water to find the
leak and repair.
5. Check for proper gas supply.
6. Tighten connection or
replace thermocouple.
7. Replace automatic control
valve.
8. Tighten wires on power switch.
9. Tighten or repair wire.
10.Tighten thermocouple. Make
sure that thermocouple is
located correctly between
reverberator and grid thermo
couple wire.
11.Replace thermocouple.
12.Replace controller.

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SPECIFICATIONS
GUARANTEE
This product is guaranteed against faulty manufacture for a period of 12
months from the date of purchase. Please keep your receipt which will be
required as proof of purchase.
This guarantee is invalid if the product is found to have been abused or
tampered with in any way, or not used for the purpose for which it was
intended.
Faulty goods should be returned to their place of purchase, no product can
be returned to us without prior permission.
This guarantee does not effect your statutory rights.
Fault Cause Remedy
Heater stops
during operation.
1. Excessive gas supply.
2. Insufficient gas supply
due to ice formation
on the cylinder.
3. The tip-over switch has
tripped.
1. Check the pressure regulator
and replace if necessary.
2. Check & use larger cylinder,
or two or more in parallel.
3. Investigate the cause, heater
has fallen over. Right it and
investigate the cause. Take
steps to prevent
re-occurrence.
Model GRH35
Gas Type Propane
Output 10.25 kW (35,000 BTU/Hr)
Regulator Pressure 37 mbar
Regulator flow rate 1.5kg/hr
Fuel Consumption 0.7 kg/hr
Gas Hose Length 2000 mm
Weight unpacked 9.2 kg
Dimensions (L x W x H) 308 x 230 x 850 mm

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PARTS DIAGRAM
PARTS LIST
1 Burner 115286-01 9 Tip Switch 115285-01
2 Thermocouple 114121-01 10 Brass Elbow 111090-02
3 Bracket 117384-01 11 Hose/Regulator 115290-04
4 Igniter Electrode 115291-01 12 Wheel 115292-01
5 Igniter Bracket 117385-01 13 Wheel Bracket 114156-02
6 Piezo-Igniter Kit 102445-01 14 Wheel Lock 115294-01
7 Orifice 115287-01 15 Main Frame Assy 117297-01
8 Valve 115285-01 16 Reflector 117310-01

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DECLARATION OF CONFORMITY

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ALSO AVAILABLE FROM THE CLARKE RANGE

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ALSO AVAILABLE FROM THE CLARKE RANGE

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