/rhz02_prospekt_gb

Room Heater

RHZ 02 - SH 800

RMG Messtechnik GmbH Otto-Hahn-Strasse 5 路 D-35510 Butzbach (Germany) P.O. Box 280 路 35502 D-Butzbach (Germany) Phone +49 (0)6033 897-0 路 Fax +49 (0)6033 897-130

Publication No. 4.632-E User麓s manual

Reliability in gas supply single-sourced across the board!

Application

2. Configuration and operation

•

Heater for rooms, cabinets and other facilities accommodating gas regulator stations.

•

Heater for other rooms and structures such as garages, workshops, stores and control rooms.

•

Heater fueled by non-corrosive gases such as natural gas, town gas, propane or butane or, upon request, other gases (quote type of gas in order).

1 Body 2 Room thermostat 3 Maximum temperature sensor 4 Control valve 5 Piezoelectric ingniter 6 Isolating valve by the building contractor 7 Pressure reducer 8 Pilot-actuated pressure control valve 9 Burner 10 Thermoelectric flame failure device (thermocouple connection) 11 Ermeto-pipe 12 x 1,5 DIN 2391 12 " " 6x1

Note: For zone 2 installation for temperature class T2 and explosion group II B gases according to the German VDE 0165/Ex-RL rules. Non-German hazardous area classification provided upon request.

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3

Properties 1

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Simple and sturdy design.

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Low gas consumption for high burner output.

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Convection heat for comfortable indoor climate.

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Compact construction for a wide range of application.

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Easy maintenance and control.

2

4

8

7 9

6

5

10

11

12

Fig. 1 Configuration

1. Technical Data RHZ 02 - SH 800 Rated heat input Rated heat output LPG rating Max. LPG pressure p

1,17 kW 0,96 kW 0,09 kg/h 50,0 mbar (for LPG) 20,0 mbar (for natural gas)

Type of gas

Main burner nozzle

Pilot burner nozzle

Natural gas

3x ø0,6mm

A26 1x ø0,66mm

LPG

1x ø0,45mm

K14 1x ø0,36mm

Heater connection: Olive joint Body material:

Grey cast iron

Inlet gas temprature: -10°C to +50°C Product Ident-No.: CE-0085AR0036 Approved in Germany by DVGW Certificate No. G81e034 Category acc to EN 437: AT: Cat. II 2H3B/P DE: Cat. II2E3B/P Accessories: • Governor for inlet pressure of 50 mbar or (Options) higher and safety shut-off valve • G 4 diaphragm meter • Pressure gage

The heater features a body (1) with a large radiator designed for optimum convective heat transfer. Pilot gas is ignited by the piezoelectric igniter (5) incorporated in the burner (9).

Gas flow is controlled by control valve (4) using the pilotactuated pressure control valve (8).

The pressure control valve (8) is controlled by signals from the maximum temperature sensor (3) incorporated in the flue (gas flow to the main burner is interrupted when the flue gas temperature rises to approx. 280°C and is restored when it drops below approx. 200°C) and the adjustable room thermostat (2). The thermoelectric flame failure device (10) interrupts total gas flow across control valve (4) in the event of pilot flame failure.

An upstream pressure reducer (7) is needed if the upstream pressure is above the rnaximum inlet pressure (see Section 6 below).

An isolating valve (6) is integrated in the gas inlet pipework.

Air enters the appliance through an air duct with an associated downstream air flap.

The burner equipped with the appropriate nozzles is designed to keep the heater body temperature below 300°C.

4. Commissioning and Control

3. Installation

Pressure control valve adjustor underneath cover Control valve actuator

Control

Actuator terminals

Wall break and bores 45° 12

Durchbruch u. Bohrmaße 114

140

Inlet pressure gage connector

Outlet pressure gage connector

Pilot gas adjustor screw

Fig. 4a Gas in- and outlets R ½" inside Pressure control valve adjustor

Fig. 2 Dimensions

Control valve actuator

Mount door central to the opening Room thermostat

Inlet pressure gage connector

Maximum temperature sensor

Pilot gas connector Bores for flange mounting

Outlet pressure gage connector

Thermocouple wire

Thermocouple connector

Fig. 4b

Control valve actuator

Pilot burner

Fig. 3 Control circuit The heater is mounted on the wall of the heated room.

Connections between the heater and the wall must be sealed to prevent any air exchange between the burner and the hazardous area in which the heater ist installed.

The air supply though a wall must be constructed with ø 110 mm without a kink.

The flue which should have a length between 1 m and 2.20 m must be vented to athmosphere.

For room temperature control, the room thermostat (2) must be integrated in the control circuit. The thermostat should be mounted on an outside wall of the room to be heated at a height of approx. 1 m above floor level.

The maximum temperature sensor (3) must be mounted on the flue and connected with the room thermostat (2) at the control valve actuator (see Figs. 3 and 4a).

Control valve connections and controls

•

Following installation, the pilot fluid and gas lines must be tested for soundness and unobstructed passage.

•

After testing, the isolating valve (6) must be opened.

•

When gas flows, the pressure downstream from the control valve (4) must be checked.

•

Following the above checks, the room thermostat (2) must be set to the appropriate room temperature.

•

For the start-up, the push button on the control valve (4) - see Fig. 5 - should be pressed until the pilot flame lights. ignition will be completed after approx. 30 secs.

(see Fig. 4a).

Pilot burner

Pilot burner

Pilot burner

Main burner I start up

II ON

III OFF coil activated

IV OFF

V lock-out

Fig. 5 Control valve operation and ignition

• The pilot flame height should be adjusted (see Figs 6a and 6b) so that the pilot flame surrounds the tip of the thermocouple (9) and the thermocouple wire (10). Pilot gas flow is adjusted by means of the pilot gas adjustment screw (see Fig. 4a). Clockwise rotation reduces the flame height, counterclockwise rotation increases the flame height.

Note: The screw should not be unscrewed beyond the top of the bore.

•

The necessary adjustments for LPG-fired heaters are described in Section 8.

•

Following adjustment, the burner ignition behavior should be observed to insure that the flame will be stable.

Note:

•

•

If the control valve (4) is not equipped with a piezoelectric igniter, the burner must be ignited manually.

Ignition is through the air duct. The burner is not accessible from inside the room heated.

The room temperature may be adjusted by setting the room thermostat control.

5. Shut-Down To shut-down the heater, gas flow must be stopped as follows:

•

The control on the control valve (4) - see Fig. 5 - must be rotated clockwise by 15 to 20°.

Note: During ignition, no flashback must occur and no flame must extinguish.

To verify proper ignition, ignition should be repeated several times by turning the control of the room thermostat (2) at intervals of approx. 5 sec. The main burner flame must extinguish and light correctly.

Flame litt-off indicates that the gas pressure downstream from the control valve is high.

Inversely flashback or unstable combustion shows that the gas pressure downstream from the control valve is low.

In both cases, the control valve pressure and the pressure at the nozzle must be checked

Note: If the control is pushed, a stop prevents the safty valve from opening. No ignition will occur.

7. Maintenance •

The isolating valve (6) must be closed.

6. Nozzle Pressure Measurement and Adjustment •

The type of gas used to fuel the heater must be the type of gas stated on the valve label.

•

The control valve inlet pressure must be as follows: Natural gas: 20 mbar LPG: 50 mbar

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To adjust the burner for natural gas combustion, the Wobbe index of the gas must be known. This information is given by the local gas distributor.

•

If natural gas is burnt, the pressure at the nozzle must be adjusted to the pressure given in section 10. The adjustment is made using the adjusting screw of the pressure control valve.

Clockwise rotation increases the pressure, counterclockwise rotation decreases the pressure.

The screw is underneath the control valve cover

No maintenance other than regular checks of proper burner operation (see Sections 4 to 6) in periods of heater shutdown or after the replacement of parts such as seals is necessary.

8. Conversion of the RHZ 02-SH 800 Heater from natural gas to LPG Conversion of control valve (4)

For conversion to LPG, the model V 5306 E 010 pressure control valve must be replaced by the model V 5306 E 1036 pressure control valve as follows:

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The line to the control valve must be depressurized.

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The two screws of the pressure control valve must be unscrewed and the pressure control valve must be removed together with the screws and the seal.

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The model 45.002.776-010 pressure control valve with its associated seal and screws must be mounted.

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The label indicating the type of gas burnt by the heater must be changed.

Conversion of heating element (1)

1 - flange 2 - seal 3 - screw 8 - burner 9 - thermocouple Fig. 6a Burner and thermocouple

For conversion from natural gas to LPG, the heating element (1) must be modified as follows (see. Fig. 6 for item numbers): • The main gas line and the pilot gas line must be removed from flange 1 by unscrewing screw connections (3) and (5). The flange (1) must then be removed from the heating element.

• After the removal of the flange the burner (8) must be removed by unscrewing and replaced by an LPG burner (see Fig. 6a).

• The pilot burner (4) with the associated thermocouple wire (10) must be removed after unscrewing screw (11) (see Fig. 6b).

• The pilot gas nozzle in the pilot gas burner (4) must be removed and replaced by an LPG nozzle.

• The pilot gas burner must then be retrofitted using appropriate cement • After the completion of this work, the pressure at the burner must be reset as described in Section 6.

• Following pressure adjustment, the entire system must be tested for leaks.

4 - pilot burner 5 - screw 7 - screw 10 - thermocouple wire 11 - screw 12 - sealing material Fig. 6b Pilot burner and thermocouple wire

Room Heater

RHZ 02 - SH 800 9. Flue and baffle installation • Item 1 shown in the drawing below is not supplied by RMG. • The flue must be vertical as shown in the drawing.

max.530

• The dia 48.3 mm x 2.6 mm flue pipe (1) must be fitted with a 20 mm R 1½" thread. The baffle (2) must be inserted in the flue as shown by the drawing and rnust be retained by a cap (3).

• Height H must be at least 1.0 m and not more than approx. 2.2 m.

a sealing with DP 300 (permanently elastic up to 300°C)

vent

X sealing with DP 300 (permanently elastic up to 300°C)

min.100, use it unchanged

1000-2200

Item X extension by the building extractor

°-

90

3

0° 18 a

20

B

min.750 Rm in 6 0

a 100

0°

18

°-

90

~ 150

90

Honeywell block

heating element

1

350

vent

use it unchanged

R11/2"

2

Outlet pipe

Pipe 48,3 ´ 2,6

400

B

T

B1 6

10. Nozzle pressure Gas kWh/m³

Natural gas L+H

13,0 13,3 13,6 13,8 14,1 14,4 14,7 15,0 15,2

Wobbe index MJ/m³ kcal/m³ 47,0 48,0 49,0 50,0 51,0 52,0 53,0 54,0 55,0

11233 11472 11711 11950 12189 12428 12667 12906 13145

LPG 50 mbar

Nozzle pressure (mbar) 100%

85%

11,9 11,4 11,0 10,5 10,1 9,7 9,4 9,0 8,7

8,6 8,3 7,9 7,6 7,3 7,0 6,8 6,5 6,3

Burner

Nozzle diameter Pilot burner

3 x 0,6

0,66 No. A 26

1 x 0,45

0,36 No. K 14

Device configuration acc. to DVGW 6628

RMG Messtechnik GmbH Otto-Hahn-Strasse 5 · D-35510 Butzbach (Germany) P.O. Box 280 · D-35502 Butzbach (Germany) Phone +49 (0)6033 897-0 · Telefax +49 (0)6033 897-130

Publication No. 4.632-E

Issue 12/2000 · Subject to technical modificaton without notice