8
Plumbing Instructions
For ESWH, the optional auxiliary electric controller functions as a pump control,
Electric heating element control and a timer. The optional auxiliary electric controller is not
displayed in Fig. 8.
1 air vent
2 hot water outlet pipe
3 water-blocking board (drip tray)
4 pressure relief valve
5 cold water inlet
6 pressure reducing valve
Instructions:
Valve k1remains open, valve k2,k3 remain closed when hot water is not used.
Open valve k2when hot water is to be used, open valve k3 to adjust the water temperature if it is
too hot.
Close valve k2, k3when you want to stop using the hot water.
Precautions:
1. When the hot water is to be used, beware of scalding as the water temperature can be very
high. Mix with cold water to achieve comfortable temperature before showering or bathing.
2. JB series solar water heater withstands pressure
≤
0.5 kgf/cm
3. The evacuated tubes resist temperatures as low as -70 when the tank is empty. Under these
conditions, for the unit without auxiliary electric controller, the tank should remain filled during
continuously cloudy or snowing days in winter; in addition, every two days the cold water in the
tank should be changed to prevent the water in the tank from freezing which might damage the
tubes.
4. Make sure the evacuated tubes are clean, hose off the dust and dirt on the tubes and the
reflector before the winter.
5. Do not fill with cold water more than once in a low solar irradiance day.
6. The overflow pipe must be connected outdoors; the overflow pipe should be placed near a floor
drain or drainage channel, the overflow pipe should never be blocked.
7. Do not connect a valve in the overflow pipe line.
8. Avoid using hot water from the unit washing machines.
Summary of Contents for JR-138
Page 10: ...10 Trouble Shooting...
