19
TIP unit heaters
1.57
Unit heaters with 2-stage three-phase motor / Unit heaters with 1-stage single-phase motor
Installation and operating instructions
9.3 Post-commissioning checks
Perform the following checks after commissioning the TIP unit heaters:
Are all the fans switched off by the thermal contact?
To do this, disconnect a wire from terminal TK of the stage switch
(Danger: 230 V!). All the fans should switch off immediately. The
operating readiness indicator must go out on the stage switch.
Reconnect the wire to terminal TK. The fans should not start up
again. Reset the stage switch and switch it on again. The fans should
restart. Briefly disconnect the connecting wires of all thermal contacts
individually to check that all thermal contacts are correctly wired.
Are the fans in all TIP unit heaters running in the correct direction
at all switching stages?
The direction of rotation is indicated by the arrow. Make sure that the
fan is drawing in air. Swap 2 phases on the stage switch if all
three-phase fans are rotating in the wrong direction at all fan stages.
Swap the auxiliary phase connections (Z1, Z2) if the single-phase motors
are rotating in the wrong direction. Check the wiring of the incorrectly
rotating fans if individual fans are rotating in the wrong direction.
Are all the impellers running smoothly or are grinding noises
audible?
Determine the cause as soon as grinding noises become audible. Possible
causes are:
a unit installed in too confined a space
dirt on site (e.g. pieces of paper) between the impeller and heat
exchanger.
Summary of Contents for TIP 54 Series
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