CAN CSA F383-08:2018 pdf download.Installation of packaged solar domestic hot water systems
7.3.1 Protection from scalding
Where the system as tested under the CSA F379 Series is capable of delivering water temperatures greater than 49。C，means shall be provided to maintain the hot water delivered by the solar water heating equipment to the user at or below
(a) 49 °C for residential occupancy applications; or
(b) the high-temperature limits as defined by the applicable plumbing codes for other small buildings.
Notes:
(1) This may be accomplished through an overheating sensor installed on the electronic controller according to the manufacturer's instructions, or by using a mechanical tempering valve on the outlet of the system.
(2) Scalding can occur at water temperatures of 49 °C.
(3) The authorities having jurisdiction should be contacted for additional requirements for scalding protection.
7.3.2 Pressure and temperature relief
Adequately sized and approved pressure and temperature relief devices as specified in ANSI Z21.22/CSA 4.4 shall be provided in pressurized solar energy equipment and piping and installed in accordance with the manufacturer's instructions. Where a portion of the system or piping can be isolated by valving,the portion shall be provided with a pressure relief device. Devices shall be set to relieve the pressure at or below the maximum allowable pressure encountered in the system.
7.3.3 Relief valve pipe discharge
Pipes that convey water from a temperature-relief, pressure-relief, or a combined temperature- and pressure-relief valve shall
(a) have a size at least equal to the size of the outlet of the valve;
(b) terminate above a floor drain, sump, fixture, or other approved safe location; and
(C) not have a shut-off valve installed on the pipe between the tank and the relief valves or on the discharge lines from such relief valves.
10.2.1 Insulation materials
Insulation materials shall be suitable for operation at a minimum temperature of 105 °C in all parts of the system involving the transfer of heated fluids. Insulation materials not supplied or specified by the manufacturer of a system, for use within 2 m of the solar collector absorber plate, shall have a minimum temperature rating of 170 °C. Insulation materials for interior use shall have a flame-spread and smoke-developed rating in accordance with the applicable building codes.
Note: The authorities having jurisdiction should be contacted for additional requirements regarding insulation and flame spread. In Canada, insulation material requirements are addressed by the National Building Code of Canada.
10.2.2 Exterior application
Insulation for exterior application shall be finished with a suitable jacket or facing with all surfaces and laps sealed. Jacketing, facing, and tapes used for exterior application shall be of materials known to be durable for service, such as aluminum and ultraviolet (UV) stable polyviny| chloride (PVC).
Where flexible insulations are used, they shall be wrapped and sealed against water penetration. The exterior wrapping shall be of materials known to be durable.
Note: Materials for exterior use should be resistant to environmental temperature extremes, UV exposure, and moisture.CAN CSA F383-08 pdf download.