INSTALLATION AND OPERATION INSTRUCTIONS
5-4
TANKLESS WATER HEATER 199
5.2.6 Domestic Hot Water Bypass Valve
This unit is equipped with a domestic hot water bypass valve which allows
cold water to bypass the heat exchanger to temper the domestic hot water
temperature.
1.
To service or replace the bypass valve:
2.
Turn off the unit and disconnect power.
3.
Close the DHW hot and cold isolation valves.
4.
Place a bucket under the drain and drain the DHW water from the unit.
5.
Disconnect and remove the bypass tube.
6.
Remove the retaining clip under the unit at the DHW filter.
7.
Disconnect the bypass valve from the heat exchanger using two wrenches.
5.2.7 Domestic Cold Water Sensor
The Combi boiler is equipped with a domestic Cold water temperature sensor. The
sensor is surface-mounted on the Cold water inlet pipe.
5.2.8 Fan/Blower
Control and power to the fan is provided via a single wiring harness to the
controller.
Figure 43: Bypass Valve
Figure 44: Domestic Cold Water
Temperature Sensor S4