OMM 1130 41
8-Fan Remote Condenser, R22, R407C
Stage Fans Operating on Circuit 1 Fans Operating on Circuit 2
1 Fan 1 Fan 2
2 Fans 1, 3 Fans 2, 4
3 Fans 1, 3, 5 Fans 2, 6, 8
4 Fans 1, 3, 5, 7 Fans 2, 4, 6, 8
8-Fan Remote Condenser, R410A
Stage Fans Operating on Circuit 1 Fans Operating on Circuit 2
1 Fan 1 Fan 2
2 Fans 1, 3 Fans 2, 4
3 Fans 1, 5, 7 Fans 2, 6, 8
4 Fans 1, 3, 5, 7 Fans 2, 4, 6, 8
10 Fan Remote Condenser, R410A
Stage Fans Operating on Circuit 1 Fans Operating on Circuit 2
1 Fan 1 Fan 2
2 Fans 1, 3 Fans 2, 4
3 Fans 1, 5, 7 Fans 2, 6, 8
4 Fans 1, 3, 5, 7 Fans 2, 4, 6, 8
5 Fans 1, 3, 5, 7, 9 Fans 2, 4, 6, 8, 10
12Fan Remote Condenser, R410A
Stage Fans Operating on Circuit 1 Fans Operating on Circuit 2
1 Fan 1 Fan 2
2 Fans 1, 3 Fans 2, 4
3 Fans 1, 5, 7 Fans 2, 6, 8
4 Fans 1, 3, 5, 7 Fans 2, 4, 6, 8
5 Fans 1, 3, 5, 7, 9 Fans 2, 4, 6, 8, 10
6 Fans 1, 3, 5, 7, 9, 11 Fans 2, 4, 6, 8, 10, 12
Normal Operation – Staging Up
At startup, the first fan will start when the saturated condenser temperature rises above the target. After
this, the stage up deadbands apply.
When the saturated condenser temperature is above the Target + the active deadband, a Stage Up error is
accumulated.
Stage Up Error Step = Saturated Condenser Refrigerant temperature – (Target + Stage Up dead band)
The Stage Up Error Step is added the Stage Up Accumulator once every Stage Up Error Delay seconds.
When Stage Up Error Accumulator is greater than the Stage Up Error Set Point another stage is started.
When a stage up occurs or the saturated condenser temperature falls back within the Stage Up dead band
the Stage Up Accumulator is reset to zero.
Normal Operation – Staging Down
There are four Stage Down dead bands, one for each stage.
When the saturated condenser refrigerant temperature is below the condenser saturated temperature target
– the active dead band, a Stage Down error is accumulated.
Stage Down Error Step = (Target – Stage Down dead band) – Saturated Condenser Refrigerant
temperature
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