Service Manual

GSM-204-523
Replacing a thermal management system (TMS) unit
31st Oct 01
Maint. 3–10
Maintenance Information: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W04-A
Refitting the
TMS unit
To refit the TMS unit:
1. Examine the TMS unit gasket for damage or degradation, replace if
necessary as described in Replacing TMS unit components.
WARNING
The TMS unit can weigh up to 40 kg. Handle with care
and observe proper lifting precautions.
2. Carefully lift the rear of the TMS unit into place, positioning the two rollers
onto the rails in the bottom wrap of the cabinet.
3. Push the TMS unit into place, lifting the front into position before locating
the front fixing brackets.
4. Feed the power supply and alarm cables through the aperture into the
power supply enclosure.
5. Fit the two, previously retained, screws and washers to secure the TMS
unit and tighten to the correct torque (see Overview of FRU replacement
procedures in this chapter).
6. Connect the earth bonding cable to the TMS unit.
7. Reconnect the following TMS cables:
– The ac cable to the plug at the front right of the power supply
enclosure.
– The dc cable to the connector at the front left of the power supply
enclosure.
– The alarm cable to the connector PL5 at the alarms interface board.
8. Switch on the TMS heater ac circuit breaker in the number 2 distribution
box and the TMS FANS at the dc circuit breaker panel.
9. Test the operation of the TMS unit as described in
Installation and
Configuration: (GSM-204-423)
Testing the thermal management
system.