Roberts Gorden MGB Series Wartungshandbuch PDF herunterladen (Seite 55)

SECTION 11: USER INSTRUCTIONS

49 of 85

reaches the first set point, the firing rate will reduce

to low fire. If the temperature rises to the second set

point, the burner will turn off. The burner will come

on again at either High or Low fire, depending on the

thermostat set point.

Set the two stage thermostat to the desired

temperature.

11.2 Common User Controls (all models)

11.2.1 Combination Fan/Limit Thermostat

The Combination Fan/Limit Thermostat is located at

the top right side of the heater.

This control ensures the heater does not blow cold

air in the normal heating cycle and protects the heat

exchanger against overheating.

Figure 22: Fan/Limit Thermostat

11.2.2 Burner Lockout Reset Button

The red warning light built into the burner control

box will illuminate when the control has gone to

lockout. This may be caused by flame failure. Wait

one minute then press the reset button.

11.3 Lighting Instructions (all models)

11.3.1 To Turn On Heater

1. E n s ure that the electrical and gas supplies to

the heater are on. Check that the on-site con-

trols are “ON”.

NOTE: The thermostat setting must be above the

ambient temperature for the heater to operate.

2. The automatic firing sequence w

ill begin as

described on Page 48, Figure 21. The heater

will now operate automatically under the control

of the on-site controls. Following long shut

down periods, the control may go to lockout.

See Page 49, Section 11.2.2.

11.3.2 To Turn the Heater Off

Set the installed remote controls to the “OFF”

position or turn down the remote thermostat below

the ambient temperature.

The burner will turn off immediately.

The fan will continue to run for a few minutes.

To restart, turn the remote control to “ON".

If the heater will remain off for a long period of time,

when the main fan(s) have stopped, turn off the fuel

supply valve and main electrical isolator. To restart

open the fuel supply valve and follow the

instructions in Section 11.3.1.

11.4 Simple Fault Finding (all models)

Some possible reasons for the heater not operating

are:

1. G a s s upply not turned ON.

2. Electricity supply not turned ON.

3. The time and/or temperature controls are not

ON.

4. The Limit Thermostat may have operated. This

may be caused by an interruption of the electri-

cal supply or failure of the distribution fan.

5. The burner supply plug has been discon-

nected.

If the Limit Thermostat persistently operates, there

is a fault which must be investigated by a contractor

qualified in the installation and service of gas or oil-

fired heating equipment.

NOTE: If the main fan runs continuously, the white

button (Page 49, Figure 22) may have been pressed

in - make sure it is pulled out. Alternatively, if a

remote fan switch is fitted it may be in the ON

position.

White fan button

Pull out for normal operation.

Press in for constant fan.

Red limit reset button

(Press to reset)

The combination fan/limit thermostat is preset

during commissioning.

See Page 11, Section 4.4 and Page 41, Figure 17.

NOTE: To reset, the heat exchanger must be cool.

If the air flow is reduced due to power failure, the

limit thermostat will cause the burner to lockout.

Description Part Number

Combination Fan/Limit Thermostat K017A

If control locks out, do not make more than 3

attempts to restart the heater.

Dangerous fuel mixtures can build up.

The fault must be traced and repaired by a

registered installer or service engineer.

Failure to follow these instructions can result in

death, injury or property damage.

Explosion Hazard

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