Clarke GRH35 Operating & Maintenance Instructions

GAS HEATER

OPERATING & MAINTENANCE

INSTRUCTIONS

Model No: GRH35

GAS HEATER

0806

For Spare Parts and Service, please contact your nearest dealer,

or CLARKE International, on one of the following numbers.

PARTS & SERVICE TEL: [phone]

PARTS & SERVICE FAX: [phone]

or e-mail as follows:

PARTS: [e-mail]

SERVICE: [e-mail]

PARTS & SERVICE CONTACTS

SPECIFICATIONS

Rating .................................................... 35,000 Btu/hr

Gas Consumption - per hour .................. 0.74kg (1.6lbs)

Gas Hose Length .................................... 3000mm

Supply Pressure Min ............................... 10psi

Dimensions ............................................ 308x230x850mm

Weight unpacked ................................ 9.2kg

Part No. .................................................. 6920016

2

Thank you for purchasing this CLARKE Gas Heater. designed for commercial 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 equipments, optimum performance will only be achieved
if the correct application and servicing procedures are followed.

Please read this leaflet thoroughly and follow the instructions carefully before
attempting to use the heater. In doing so you will ensure the safety of yourself
and that of others around you, and you can look forward to it giving you long
and reliable service. Keep this booklet safe for future reference, as any person
who has not read this booklet should not be allowed to operate the heater.

CONTENTS PAGE

Safety Precautions ........................................................................... 3

Electrical Connections..................................................................... 4

Wiring Diagrams ................................................................................ 5 - 6

Gas Connection ............................................................................... 7

Operation .......................................................................................... 7

Starting Procedure ........................................................................... 8

Stopping Procedure ......................................................................... 10

Maintenance .................................................................................... 10

Trouble Shooting ............................................................................... 11

Specifications.......................................................................................... 12

GUARANTEE

This CLARKE product is guaranteed against faulty manufacture for a period
of 12 months from the date of purchase. Please keep your receipt 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.

3

SAFETY PRECAUTIONS

WARN IN G!

Lack of ventilation can cause Carbon Monoxide poisoning.

Carbon Monoxide poisoning can kill.

Signs of Carbon Monoxide poisoning are, headaches, dizziness and/or nausea.
Should anyone show these signs, they must GET FRESH AIR IMMEDIATELY. Turn off
the heater and have it serviced before using again.

Pregnant women, persons with a heart or lung condition, anaemia or under the
influence of alcohol, or those at high altitudes, are more likely to be effected by
Carbon Monoxide than others.

Read, and make sure you fully understand the following precautions and the
hazards associated with this type of equipment.

• This heater is not designed for use on finished floors.

• NEVER move the heater when it is lit.

• Use ONLY Propane gas

• Ensure the Propane gas bottle, gas hose and electric cable, are positioned
BEHIND the unit, well away from the heat... minimum distance of 6 feet (2M)

• Ensure all gas hose and regulator connections are GAS TIGHT, and the hose
is not kinked.

• NEVER use the heater where Gasoline, Paint thinner or other highly flammable
vapour or high dust content is present.

• Use ONLY in well ventilated areas. Provide a ventilation opening of at least 3
square feet to fresh, outside air.

• The minimum clearance from any combustible materials is 8 feet (205cm)
from the front and 4 feet (100cm) from the top and sides.

• ALWAYS locate the heater on a stable, firm level surface

• Keep children and animals well away from heater at all times.

• Use heater in accordance with all fire regulations.

• NEVER use heater in living or sleeping areas.

• NEVER leave a heater, when lit, unsupervised - an individual should always
be made responsible for monitoring it.

• NEVER move, handle, replenish gas supply or service the heater when it is
hot, or operating .

• Use ONLY the regulator supplied with the heater.

• If the heater works for long periods, be aware that it is possible for ice to form
on the cylinder, due to excessive evaporation. NEVER direct hot air towards
the cylinder in order to de-ice. The cylinder temperature should NEVER
exceed 100

O

F (38OC)

• ALWAYS store gas cylinders according to ‘Highly Flammable Liquids and

Liquefied Petroleum Gases Regulations 1972’

4

UNPACKING

On unpacking, check the heater for possible shipping damage. Should any
damage be apparent, please notify your Clarke dealer immediately.

Your heater is fully assembled, It is only necessary to connect the gas supply.

FEATURES

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.

1. 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 -20o F (-29oC).

2. Ignition System

A Piezoelectric 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, a low voltage is fed to the Safety Cut-Off
Valve, causing the valve to open, so that after a short period, the Control Valve
button (see Operation) may be released, and the main flame is established.

3. 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.

Ensure ALWAYS that the Tip-Over switch is per fectly vertical and secure.

5

6

VENTILATION

WARNING:

Provide at least a 3 ft2 opening of fresh, outside air whilst running this

heater. If proper fresh, outside air ventilation is not provided, carbon

monoxide poisoning can occur.

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 before
each use and 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.

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. DO NOT operate this heater with the supply cylinder

in any other than 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.

This appliance produces radiant heat. Therefore, it must be located at least 6
feet away from any propane gas cylinder and must not be directed toward any
gas container within 20 feet.

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.

7

OPERATING INSTRUCTIONS

WARNING:

If you do not follow these instructions exactly, a fire or explosion may

result causing property damage, personal injury or loss of life.

The heater must be located at least 6 feet away from the propane cylinder and
must not be directed toward any gas cylinder within 20 feet. If more than one heater
is used, they and the supply cylinders must be separated by at least 20 feet.

CAUTION:

This appliance is hot during normal operation, avoid physical contact.

Do not place clothing or other combustible materials on this appliance.

DO NOT operate this heater if any part has been under water. Call a qualified
service technician to Inspect the appliance and to replace any part of the control
system or gas control valve which has been under water.

Gas Connection

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 (2M).

In order to reduce the risk of icing up when
operating at long periods at maximum
capacity, you should use a larger capacity
gas bottle, or two/three bottles in parallel, as
shown in Fig. 1.

The Tee piece and ‘pigtails’ are readily
available from Builders Merchants or gas
suppliers.

Fig.1

WARNING

Propane Gas cylinders must be used and stored in accordance with the

‘Highly Flammable Liquids and Liquefied Petroleum Gases Regulations 1972’

Lighting the Heater

WARNING!

Before starting the heater, you MUST ensure that the minimum ventilation

requirements are observed to avoid the risk of carbon monoxide poisoning.

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 plunger,
shown in Fig.2, 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 every 10-15 seconds until it ignites.

2A. Alternatively, hold a lit taper to the burner face while pressing and holding

the control valve button. After the burner ignites, keep button pressed for
one (1) minute or until the burner stays lit after releasing button.

Fig.2

Fig.3

WARNING!

When lighting

burner with a

taper, light at

bottom of

screen. Not at

the orifice.

8

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.

IMPORTANT: DO NOT reopen the propane gas supply cylinder valve before the
safety valve closes.

CLEANING AND MAINTENANCE

WARNING: Never attempt to service heater while it is

(a) connected to propane supply,
(b) operating or
(c) hot. (Severe burns can occur.)

1. Turn heater off and let cool at least 20 minute, before cleaning.

2. Keep heater clean. Clean heater annually or as needed to remove dust
and debris. If heater is dirty or dusty, clean heater 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 heater before each use. Check connections for leaks. Apply mixture
of liquid soap and water to connections. Bubbles forming show a leak. Correct
all leaks at once.

4. Clean inside of heater using compressed air where possible. Blow air back
and forth along the entire burner face until all dust has been dislodged from
surface of the screen. Blow air through venturi from the control end (orifice)
of heater.

5. Inspect hose/regulator assembly before each use. If hose is highly worn or
cut, replace.

6. Have heater inspected yearly by a qualified service agency.

9

TROUBLE SHOOTING

FAULT CAUSE REMEDY

10

Burner fails to light 1. Gas supply valve closed 1. Open gas supply valve slowly

2. Excess-flow check valve 2. Close propane supply valve on
closed propane tank and
reopen slowly

3. Blockage in burner orifice 3. Replace burner orifice

4. Piezo ignition not sparking 4. Assure 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. The orifice is obstructed.

4. Gas leaks from the
supply hose or from
the tap.

5 Low gas pressure 5. Check for proper gas supply
6 Thermocouple loose or 6. Tighten connection or

needs to be replaced replace thermocouple

7. Automatic control valve 7 Replace automatic control
needs to be replaced valve

8. Loose wires on tip over 8. Tighten wires on tip over
switch switch

9. Loose or broken wire 9. Tighten or repair wire

10. Loose or mislocated 10. Tighten thermocouple. Make

sure thermocouple is located
correctly between
reverberator and grid
thermocouple wire

11. Defective thermocouple 11. Replace thermocouple

12. Defective control 12. Replace 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.

The 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, and use a larger
cylinder, or two or more in
parallel.

3. Investigate cause. If heater has
fallen over, right it and
investigate cause. Take steps to
prevent recurrence

11

PART NO.

1 115286-01 Burner
2 114121-01 Thermocouple
3 117384-01 Thermocouple Bracket
4 115291-01 Igniter Electrode
5 117385-01 Igniter Bracket
6 102445-01 Piezo lgniter Kit
7 115287-01 Orifice
8 115285-01 Valve
9 115289-01 Junction Block
10 11528S-01 Tip Switch
11 111090-02 Brass Elbow
12 115290-04 Regulator Assembly
13 115292-01 Wheel
14 114156-02 Wheel Bracket
15 115294-01 Wheel Lock
16 117297-01 Main Frame Lower Assembly
17 117310-01 Reflector

PARTS AVAILABLE NOT SHOWN

114245-06 General Information Label
115297-01 Warning Label
114246-03 Caution Label

PARTS LIST AND DIAGRAM