1592001440 XC645CX GB r3.4 31.10.2017.docx XC645CX 42/54
19.4 Hot gas injection valve
Controller can manage a hot gas injection valve to increase suction superheat. See above figure.
19.4.1 Parameters
A relay must be set as hot gas valve: oA2 or oA3 or oA4 or oA5 or oA6= HGi, and
an auxiliary probe among P3 (term. 3-4) or P4 (term. 33-34) has to be set as superheat
temperature probe ASH9 = P3 or P4.
Then the following parameters:
ASH7 Superheat value to enable hot gas injecting valve (0.1 to 15.0°C/ 1 to 30°F)
ASH8 Differential for ASH7 (0.1 to 30.0°C/ 1 to 60°F)
19.4.2 Regulation:
The regulation respects the following schema:
Superheat < ASH7 – ASH8 HGi on
Superheat > ASH7 HGi off
ASH7 < Superheat < ASH7 – ASH8 The state is maintained.
19.4.3 Special conditions
a. With ASH9 = nP: none probe set as SH probe and one relays set as HGi (valve for hot
gas injection) the configuration error is displayed “no Probe For SH”, and the relay set
as HGi is never activated..
b. If the probe used to calculate the SH is in error the related probe fault alarm is
generated (P3 or P4) and the HGi relay is not activated.
20. Alarm list
Usually alarm conditions are signaled by means of:
1. Activation of alarm output 0-12V
2. Buzzer activation
3. Message on proper display
4. Log of alarm: code and duration.
The table at paragraph 20.3
20.1 Types of alarms and signaling managed
20.1.1 A12: Configuration alarm
The following configuration parameters are checked after each modification.:
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