sum/z ratio will be overridden if any one of the following conditions is satisfied.
1
Cooler freeze protection
2,3
Very Low saturated suction temperature
4
Low source temperature protection
5,6
Low discharge superheat temperature
7, 8
Low temperature Cooling/High temperature heating
9
Demand limit
10
Cooler Lock
11
Slow change override
12
Ramp loading
13
Minimum ON/OFF delay
14
High temperature cooling and low temperature heating
15
System Manager control
16, 17
High pressure
18,19
High current
20, 21
Low saturated suction temperature
22,23,24,25
High condensing temperature
28
Compressor startup with loader 1 on due to low condensing temperature
26, 27
Low Oil Level when circuit is OFF
29,30
Stopping circuit due to low oil level (allowed thrice within 2 hours) before going to alarm
31,32
High motor temperature on economizer units (T° > 93°C)
33,34
Stopping compressor due high motor temperature (T° > 110°C, allowed thrice within 2 hours)
before going to alarm
35
Chiller current limit
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.
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If the chiller current is greater than the chiller current limit , then a stage of capacity will be removed.
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If 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.
CARRIER SA
USER'S GUIDE FOR
30GX&HX PRO_DIALOG 4 V.2
ECG-UG-02-002
Rev: Original
Page: 39/98
©
C
ARRIER
S
.
A
NOT
TO
BE
DISCLOSED
TO
PERSONS
OUTSIDE
CARRIER
ORGANIZATION
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