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Procedure 8
8. CHECK AND REPLACE THE ELECTRONIC EXPANSION VALVE ASSEMBLY
Electronically regulated expansion valve ERV; Code:
C0050014;
Model:
DPF(Q)1.3C-01(1-RK
Tools:
Screw driver PH2; Pliers; spanner S10; S12; S13; Cutting tool for copper pipe; burner for brazing; brazing rods; vacuum pump; recovery unit; bottles for refrigerant; scales; leak detectors;
pressure hoses; Instrument for parameters check
Risk of electric shock!
Disconnect the HPWH from the main electric supply!
Risk of injuries due to refrigerant vapors!
Discharge refrigerant!
Use special protective gloves for refrigerant and eyeglasses!
Risk of burning while brazing copper pipes!
Use special protective gloves and eyeglasses!
1) Switch off the HPWH
2) Disconnect the HPWH from the main electric supply!
3) Open the PCB box as per procedure 1.
4) Tear up the cable bundle containing the cable of ERV
5) On terminal CN19 (
Fig: pr.8.2)
, disconnect the cable of ERV
6) Discharge the refrigerant as per procedure 9
7) Dismantle ERV by unbraze its supplying copper pipes
8) Attach a new one
9) Replace both refrigerant filter/dryers too
10) Braze its copper connection
11) Vacuuming as per procedure 9
12) Charge refrigerant 880
– 890g as per procedure 9
13) Check for refrigerant leakage as per procedure 9
14) Check working parameters as per procedure 9
15) Assemble everything at the reverse order, do not forget to tighten
again the cables into the bundle. Assure that no cables are in contact
with moving parts or sharp edges.
Fig: pr.8.1:
Fig: pr.8.2:
ERV
Refrigerant
filter
