Roberts Gorden MGB Series Manual de Serviço descarregar pdf (Página 47)

SECTION 10: COMMISSIONING

41 of 85

10.1.1 Louvers

Where fitted, the air delivery louvers need to be set

during commissioning to give the required air

distribution.

10.1.2 Electrical Checks

All pre-commission checks must be carried out

before commissioning the heater.

1. Check that all site wiring is connected in

accordance with the appropriate wiring dia-

grams shown on Page 28, Section 9.3 through

Page 39, Section 9.14.

2. Check the correct fuse size is fitted in the local

supply isolator. See Page 11, Section 4.4.

10.1.3 Polarity Test - 1 Ø

10.1.4 Polarity Test - 3 Ø

Voltage between each phase L1, L2 and L3 and

Earth or Neutral should be approximately 230 V.

Voltage between any 2 phases should be

approximately 400 V. Test Neutral to Earth as single

phase.

10.1.5 Fan Rotation Check

Switch on the electricity supply at the isolator and

the manual switch to "fan on" (if no remote fan switch

is installed, press the white button on the fan/limit

thermostat). On 3 Ø heaters, check the rotation of

the main fan. Rotation should be in the direction of

the arrow shown on the fan housing. If rotation is not

correct, turn off the isolator and change over any

wo of the incoming supply phases and recheck. It

will be necessary to remove the lower front or right

side panel to see fan rotation.

10.1.6 Fan Motor Overload Check

On 3 Ø belt drive heaters, check the correct settings

of the fan motor overload. This should be 0.2 A

above the rated current on the heater data plate.

See Page 11, Figure 4.4. The belt tension and

alignment should also be checked and adjusted as

shown on Page 52, Figure 23.

10.1.7 Mechanical Checks

1. Check that the flue is installed in accordance

with these instructions and local regulations.

2. Check that the settings of the Combination Fan/

Limit thermostat are correct - See Page 41,

Figure 17.

Figure 17: Combination Thermostat (all models)

10.1.8 Burner (gas heaters)

Two-stage (High/Low) burners have additional

specific requirements. Follow the manufacturer's

instructions, the data provided on Page 11, Section

4.4 through Page 13, Section 4.7, and the

commissioning instructions on See Page 43,

Section 10.3.

10.1.9 Gas Supply

All aspects of the gas installation, including the gas

meter, must be inspected, tested for so

undness and

purged in accordance with local and national codes.

Ensure that the air is fully purged from the heater

inlet pipe up to the main gas valve inlet test nipple.

Adjust the pressure switch located on the Dungs gas

valve to 50% of its minimum inlet working pressure.

10.1.10 Before Operating the Heater

Ensure the burner head, air damper and pressu re

switch settings are adjusted for the correct burner in

accordance with the Data Tables on Page 11,

Section 4.4 through Page 14, Section 4.8 (see the

burner reference letter on data plate).

To ensure that all the controls are in safe working

order, operate the heater for the first time with the

isolating gas valve turned off.

1. Turn off the gas isolating valve

2. Using the installed external control, turn on the

burner. The automatic sequence w

ill now begin

as described on Page 43, Figure 18.

There will be no ignition of the burner and lockout

will occur, which proves the controls are operating

correctly.

10.2 Commissioning the Single Stage Burner

(gas heaters)

Follow the manufacturer's instructions and the data

provided on Page 11, Section 4.4 through Page 14,

Section 4.8.

Less Than

0.1 ohm

ohm

230v 50Hz AC

(must be less than 15v)

Supply

Earth

Terminal

C°

100

120

Set Point 1

Fan Off

Set to 38°C

Set Point 3

Limit

Set to 110°C

Set Point 2

Fan On

Set to 60-65°C

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 91 92

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Roberts Gorden MGB Series Manual de Serviço Página 47

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