Honeywell EXCEL 5000 User Manual page 277

EXCEL CARE CONTROL ICONS
The second stage switches on when:
The first ventilator stage is switched on for at least 60 seconds.
AND
The Time Program (or application program) requests the second stage.
These two conditions guarantee that the switch from first to second stage
occurs 30 seconds after the second stage is requested.
AND
The negative cycle transition from STARTUP occurred at least 60 seconds
before (that is, STARTUP must be zero for a minimum of 60 seconds)
OR
The Time Program (or application program) requests the second stage.
AND
The second stage was already on.
These two conditions prevent the second stage from switching off
immediately after switching on.
AND
The negative cycle transition from STARTUP occurred at least 60 seconds
before (that is, STARTUP must be zero for a minimum of 60 seconds).
Switching action summary:
After power returns, nothing happens for 20 seconds, that is, both ventilator stages
remain switched off even if the Time Program requests a stage. After the 20-second
delay, there is another delay time of 60 seconds. This time varies ventilator switch-
on in case there are multiple ventilators. When the 60-second time delay expires,
there are two cases:
1. The Time Program requests the first stage. The first stage starts.
2. The Time Program requests the second stage. The first stage starts for 30
seconds to bring the ventilator into rotation. After a delay of 30 seconds, the first
stage switches off and the second stage switches on.
When switching from the second stage back to the first stage, both stages switch off
for 90 seconds. This action lets the ventilator "run out". The first stage switches back
on only after 90 seconds. This action serves the drive belt by avoiding abrupt
changes in acceleration. The follow diagram illustrates switching action:
279
APPENDIX B: STARTUP USER ADDRESS
EN2B-0184 GE51 R0518 (Europe)
74-5577–33 (US)