Installation and Operation manual ETHOS 36C and ETHOS 54C –1511/05-issue1
Page 11
3.11 Pump circuit
Depending on the boiler version, several types of pumps can be found inside the appliance; a built-in Grundfos UPS
15-60 HB pump or a Grundfos UPS 15-70 HB pump (Ethos 54C only).
3.11.1 On/off pump
The pump has a speed switch which is factory-adjusted to the
highest position.
Attention!
The pump speed should not be adjusted
The appliance has a built-in pump overrun timer.
3.12 Frost protection
The boiler has a built-in frost protection for activating the central heating pump when the boiler water temperature is
8°C. When the boiler water temperature is 5°C, it will also ignite the burner until the supply temperature is 10°C.
Attention!
Any other parts of the installation that may be subjected to frost or freezing should have additional protection fitted.
3.13 Connecting the gas pipe
At the planning stages it may be necessary to contact the local gas supplier to ensure an adequate supply of gas is
available.
An existing service pipe must not be used without first contacting the local gas supplier.
All gas pipe work should be installed by a competent person and in accordance with all current standards and
regulations.
The boilers gas pipe should be calculated and sized to supply adequate gas working inlet pressure of 20mbar
(minimum) for natural gas and 37mbar for LPG.
All gas pipe work should be tested for gas tightness.
Only pressure-test the gas supply pipe as far as the boilers isolation valve. The gas valve cannot withstand the high-
test pressure, since it was designed for a maximum working pressure of 60 mbar.
Bleed the gas pipe carefully in the open air, before operating the appliance for the first time.
Position
Ι ΙΙ ΙΙΙ
Ethos 36C X Right Right
Ethos 54C X X Right