Operation Control; Safety Valve; Thermostat; 3-Way Valve - Panasonic WH-TD20B3E5 Service Manual

8. Operation Control

8.1

Safety Valve

• Use commercial T-joint to joint connection (D) of
safety valve. Please install between water supply
inlet and water supply tube at below of front side of
main unit.
• Please connect discharge drain at connector (R).
During boiling, when pressure is above 9bar,
expanded water will come out and it is not
abnormality.
• Close the water supply main tap, open faucet and
turn the safety valve knob K to clockwise direction
until stopped at open position, and hot water from
tank can be discharged.
• When safety valve is not installed, tank may be
damage. It must be installed
8.2

Thermostat

st
• 1
stage Set 88°C (Can be cancelled by remote
control) Must not change the volume knob.
nd
• 2
stage Set 95°C (Can be cancelled by
thermostat reset button).
• Reset button located on upper part of the
thermostat, this button will release and cut all
power to the heating element if the internal
temperature in the water heater rises above 98°C.
If this occurs, the function of the thermostat must
be checked by authorized personnel before the
reset button is pressed.
8.3

3-Way Valve

• The purpose of 3-way valve is to change the hot water flow to heating panel or to water tank.
• Control content
- During 3-way valve OFF, the hot water will supply to heating panel.
- During 3-way valve ON, the hot water will supply to water tank.
- During OFF condition, the 3-way valve will be switch to OFF position.
Drain connection water
R
discharge (3/4BSP)
K
D
Reset button
Safety cut-out
Thermostat
Temperature
adjustment
Electric
element 5/4"
14
Safety valve
Connection (1/2BSP)
Water supply valve
(field supply)
Tee Joint
(field supply)