56 Broome Corporate Parkway
Conklin, NY 13748 USA
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www.sunmaxxsolar.com
Page 11 of 47
4.4 System pipe anti-freezing protections
This is a direct DHW system. The plumbing copper pipe needs anti-freezing
protection when the lowest temperature is below 23 Fahrenheit or -5 Celsius in the
coldest climate. The detail anti-freezing protection is described as follows.
The tables SRCC uses to evaluate the freeze protection provided by pipe insulation
indicate that 1.5 inches of insulation on a 0.75 inch type L copper pipe will protect the
pipe down to about 14F. It would be ok for the whole system if the entire pipe was
insulated well under this temperature condition.
It would be better to drain down the whole system if the temperature is lower than
14
o
F to avoid the connecting pipe freezing. The connecting pipe can be protected
against freeze damage.
In case of black out or power outage occurs during the cold weather when the
temperature is lower than 14 Fahrenheit or -10 Celsius, a system drain out procedure
must be followed as follows, and the existing Aux water heater must have adequate
capacity, listed and labeled by an accredited listing organization to continue provide
adequate hot water.
Step 1: Shut off V2 and V3 Solar Isolation valves to Isolate Solar System.
Step 2: Open V1 to using Aux hot water heater system, and bypass the solar water
system. Ensure the V0 is open.
Step 3: Connect Garden Pipe to both Drain Valve V4 and V5.
Step 4: Put the both Garden Pipes in the house drain dock or sinks.
Step 5: Open both V4 and V5 drain valves, until no more water comes out of either
pipes.
Step 6: Shut off both V4 and V5 drain valves.
When the electricity power is back to normal, follow the system start-up procedures to
set up the system to normal operation.
