Overrides - Carrier Pro-Dialog CONTROL 4 User Manual

sum/z ratio will be overridden if any one of the following conditions is satisfied.
1
2,3
4
5,6
7, 8
9
10
11
12
13
14
15
16, 17
18,19
20, 21
22,23,24,25
28
26, 27
29,30
31,32
33,34
35
Note : When overrides 2,3 , 5, 6, 16, 17, 18, 19, 20, 21 are active, the variable close control (cls_ctrl) shall be
enabled whatever the configuration to allow unloading the last loader in the circuit.
Chiller Current Override (override #35)
This function allows customer to limit the total current (it does not include current of fans, valves, heaters, oil pumps
...) of all the compressors during operation. The chiller current limit can be modified through USER configuration
(USER table or User configuration by main interface). This function is similar to demand limit function.
wIf the chiller current is greater than the chiller current limit , then a stage of capacity will be removed.
wIf chiller current plus the added current of selected compressor is greater than the chiller current limit, the
increase of capacity will not be allowed. If the compressors is OFF, its added current is 80% of its MTA. If the
selected compressor is on but deos not reach 100% capacity, an added stage on the same compressor will add
40% of its current.
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CARRIER SA
30GX&HX PRO_DIALOG 4 V.2
Cooler freeze protection
Very Low saturated suction temperature
Low source temperature protection
Low discharge superheat temperature
Low temperature Cooling/High temperature heating
Demand limit
Cooler Lock
Slow change override
Ramp loading
Minimum ON/OFF delay
High temperature cooling and low temperature heating
System Manager control
High pressure
High current
Low saturated suction temperature
High condensing temperature
Compressor startup with loader 1 on due to low condensing temperature
Low Oil Level when circuit is OFF
Stopping circuit due to low oil level (allowed thrice within 2 hours) before going to alarm
High motor temperature on economizer units (T° > 93°C)
Stopping compressor due high motor temperature (T° > 110°C, allowed thrice within 2 hours)
before going to alarm
Chiller current limit
NOT TO BE DISCLOSED TO PERSONS OUTSIDE CARRIER ORGANIZATION
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ARRIER S A
ECG-UG-02-002
Page: 39/98
Rev: Original