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4. Refrigerant charging procedure
In addition to conventional charging procedures, the following requirements shall be followed;
Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses
or lines should be as short as possible to minimise the amount of refrigerant contained in them.
Cylinders should be kept upright.
Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.
Label the system when changing is complete (if not already).
Extreme care should be taken to not overll the refrigeration system.
Prior to recharging the system, it should be pressure tested with the appropriate purging gas. The system
shall be leak tested on completion of changing but prior to commissioning. A follow up leak test should be
carried out prior to leaving the site.
Protection and Failure Codes
No. Display Protection Code Description
1 E3 No water protection
2 E5 Power supply exceeds operation range
3 E6
Excessive temp difference between inlet and outlet water
(Insufcient water ow protection)
4 Eb Ambient temperature too high or too low protection
5 Ed Anti-freezing reminder
No. Display Failure Code Description
1 E1 High pressure protection
2 E2 Low pressure protection
3 E4 3 phase sequence protection (three phase only)
4 E7 Water outlet temp too high or too low protection
5 E8 High exhaust temp protection
6 EA Evaporator overheat protection (only at cooling mode)
7 P0 Controller communication failure
8 P1 Water inlet temp sensor failure
9 P2 Water outlet temp sensor failure
10 P3 Gas exhaust temp sensor failure
11 P4 Evaporator coil pipe temp sensor failure
12 P5 Gas return temp sensor failure
13 P6 Cooling coil pipe temp sensor failure
14 P7 Ambient temp sensor failure
15 P8 Cooling plate sensor failure
16 P9 Current sensor failure
17 PA Restart memory failure
18 F1 Compressor drive module failure
19 F2 PFC module failure
20 F3 Compressor start failure
21 F4 Compressor running failure
22 F5 Inverter board over current protection
23 F6 Inverter board overheat protection
24 F7 Current protection
25 F8 Cooling plate overheat protection
26 F9 Fan motor failure
27 Fb Power lter plate No-power protection
28 FA PFC module over current protection
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General