rating not less than 200
°
F. Temperature reading may be via digital readout, LCD screen, internet
or other electronic device. The temperatures may be read at the differential controller screen. The
range of measurement shall be not less than 30
°
F to 200
°
F with an accuracy of +/- 2%.
Sensor Wire:
Sensor wire for temperature sensors or other electronic sensors must be no less than 18/2 AWG.
Sensor wire must be insulated; in locations where the sensor wire is exposed to the elements it
must be UV resistant and rated for outdoor use.
Piping and Hoses
Piping and Hoses shall be copper tube or corrugated stainless steel with a maximum operating tem-
perature of not less than 220
o
F and maximum working pressure of not less than 125 psi.
Pipe Insulation
Pipe insulation shall have a maximum operating temperature of no less than 220
o
F. All pipes shall
be insulated to R2.6 or greater, typically this will require a wall thickness of ¾” or greater. When
located in exposed areas, pipe insulation shall be protected with a UV resistant coating or jacket.
Auxiliary Water Heaters
The auxiliary water heater shall be listed by an accredited listing organization.
The specific auxiliary water heater selected for a system should be adequately sized to meet the full
hot water load at the residence taking into account the delivered hot water temperature; the mains
cold water temperature and the expected hot water usage as per standard water heater sizing
guidelines.
APPENDIX A
Summary of Contents for CASCADE 2
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