Water Pipes, Fittings And Insulation; Frost Protection Mode - Rinnai Enduro XL SP250B Operation & Installation Manual

INSTALLATION INFORMATION

WATER PIPES, FITTINGS AND INSULATION

The solar hot and solar cold pipes between the solar storage tank and solar collector(s) must be
copper tube. Fittings used to join these pipes must use metallic materials to achieve sealing. Plastic
IMPORTANT pipe and fittings must not be used as they are not suitable for the high temperatures and pressures
that may occur. Failure of plastic pipe and/or fittings can lead to the release of high temperature water
and can cause severe flooding and water damage.
All hot water pipework should be insulated with sealed polyethylene foamed or equivalent insulation to optimise
performance and energy efficiency, and to protect against frost damage. Such insulation may also be mandatory
under local regulations.
Rinnai recommend insulation on all pipes to achieve at least R 1.0 K.m²/W.
With the exception of solar collector flow and return pipes, water pipe sizing should be performed in accordance
with AS/NZS 3500.
All supplied insulation materials must be fitted as shown to minimise heat losses. In frost prone areas this insulation
will also protect against frost damage. If frost valves are fitted they must remain free of any insulation materials.
Frost valves must be exposed directly to ambient air conditions to ensure correct operation.

FROST PROTECTION MODE

The Solar Controller has two different temperature modes. Low temperature mode and standard operating mode.
When the controller is in low temperature mode, the pump will circulate water to the collectors when the temperature
on the roof drops low enough, to prevent freezing of the collectors.
Standard operating mode may be used for systems using flat plate collectors. Refer to the warranty booklet for
more details.
Mode
Standard operating mode
Low temperature mode
Power MUST be turned OFF to the controller before opening the controller box.
Power MUST be OFF when adjusting dip switches
WARNING
Rinnai
Frost protection dipswitches on solar controller
Dip Switch K1
SOM ON
LTM
14
Dip Switch K2
CIR
CIR
Low Profile Roof Mounted OIM