Roberts Gorden MGB Series Manual de servicio descargar pdf (Pagina 70)

COMBAT

CABINET HEATERS INSTALLATION, COMMISSIONING, OPERATION AND SERVICE MANUAL

64 of 85

3. Disconnect the overload fixing and connecting

screws from the bottom of the contactor.

4. Ensure that any replacement overload is of the

correct rating and that it is reset correctly. See

Page 41, Section 10.1.6.

15.3 Control Circuit Protection

The control circuit only is protected by a 10 Amp re-

settable circuit breaker and does not disconnect the

mains electrical supply to this appliance.

NOTE: In off position, the circuit breaker will still

have live electrical components exposed.

15.4 Combination Fan/Limit Thermostat

To gain access to the thermostat:

1. Loosen the cover retaining screw (on top) and

remove cover.

2. Disconnect the electrical connections by push-

ing in with a small screwdriver and pulling out

the wiring. See Page 65, Figure 24.

3. Unscrew the conduit bush and the two screws

and withdraw the unit from the cabinet.

4. Reverse these instructions to refit. See Page

41, Figure 17 to set the new thermostat.

15.5 Main Fan Motor (3 Ø Belt Drive)

1. Disconnect electrical connections at contactor

and overloads. See Page 63, Section 15.2.

2. For Star/Delta starters, there are six wires

between the motor and the starter.

3. Remove the left lower side panel to access the

motor.

4. Unscrew the bolts securing the motor to the

mounting bracket. Lift the motor out.

5. Reverse these instructions to refit, tensioning

the belts as on Page 52, Figure 23 and ensur-

ing the pulleys are aligned.

6. For Star/Delta starters, pay specific attention to

the six motor connections.

15.6 Main Fan Units

Depending on the model of the heater, the main fan

unit will be direct drive (with integral motor) or belt

drive. Models 060-100 are belt drive, double fan

units. All the fans are secured to the base of the

heater by four bolts per fan case, and to the fan tray

by bolts through the outlet flange.

To gain access to the fans:

1. R e m o ve the lower side panels of the heater.

For models 060-100 and High Flow models,

remove the upper side panels of the same side

and the vertical centre bar to allow the fans to

slide out of the cabinet.

2. Disconnect the electrical connections. On

direct drive units, these will be at the terminal

block for single phase and at the contactor for

three phase.

3. Remove the screws. The fan will pull o

ut of the

heater through the side.

4. Reverse these instructions to refit, tensioning

the belts as on Page 52, Figure 23.

5. Check the correct rotation of the fan as on

Page 41, Section 10.1.5.

NOTE: The direct drive fan unit motor can only be

replaced as a complete fan/motor assembly.

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 91 92

Comentarios a estos manuales

Sin comentarios

Roberts Gorden MGB Series Manual de servicio Pagina 70

Comentarios a estos manuales