The added expense of a recirc system is not usually warranted unless the solar tank
and the conventional water heater are far apart.
4.3
DHW System Startup
Single Pass Startup:
Testing the DHW system requires the tank installation and wiring be complete, the tank
full of water, and the pressurized lines leak tight and full of water. The collector loop
should be in operating condition. If the tank is warm, turn on a hot water faucet in the
building. Open the solar tank door and grasp the two pipes going in and out of the
DHW exchanger. Note the flow of water through the exchanger by the change in
temperature of the pipes as the water flows through them.
Recirculator Startup:
Turn the recirculator Delta-T controller switch to the ON position. Observe that the
recirculator pump runs and the water moves through the heat exchanger by noting the
temperature change in the incoming and outgoing lines.
HoloTech
tm
Solar Installation Manual
19
!
Figure 4.2 Recirculator DHW Piping Diagram
Controller
Sensor Well
Cold
Water
Heater
Hot
Hi Temp
Sensor
Lo Temp
Sensor
Cut Dip
Tube
Figure'4.2''Recirculator'DHW'Piping'Diagram'
Figure 4.2 Recirculator DHW piping diagram.
