Daikin Altherma 3 R F, Installer'S Reference Manual

Page: 258 / 312

14 | Maintenance and service
Installer reference guide
258
ERLA11~W1 + EBVH16SU23DJ
Daikin Altherma 3 R F
4P655196-1 – 2021.09
c
a
b
a Cartridge
b Strainer
c Calibration screw
1 Unscrew the plastic cover of the pressure reducing valve.
2 Extract the cartridge with the aid of long nosed pliers to grip the head of the
set screw.
3 Remove the strainer element.
4 Clean the strainer element and cartridge under clean running water.
5 Replace if the strainer or cartridge are damaged.
6 Refit the strainer, cartridge and cover.
7 If the cartridge has been replaced, calibrate the pressure reducing valve:
▪ Close the downstream isolating valve (field supply).
▪
Install an Allen key on the calibration screw in the centre of the plastic cover.
Rotate it clockwise to increase the outlet pressure and anticlockwise to
reduce it.
Temperature and pressure relief valve
Check for correct operation of the temperature and pressure relief valve. Manually
operate the temperature and pressure relief valve to ensure free water flow
through discharge pipe. Turn knob left.
14.3 To drain the domestic hot water tank
DANGER: RISK OF BURNING/SCALDING
The water in the tank can be very hot.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Close the cold water supply.
Prerequisite: Open all the hot water tapping points to allow air to enter the
system.