Connection Of Overheat Protecting Cooling Loop With A Safety Valve Honeywell Ts 130 - 3/4 A Or Watts Sts20; Operating Instructions; Preparing Boilers For Operation - Atmos C15E Instruction Manual

27. Connection of overheat protecting cooling loop with a safe-
ty valve Honeywell TS 130 - 3/4 A or WATTS STS20
(valve opening temperature 95 - 97°C)
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Attention – cooling loop to prevent overheating must be used in compliance with EN
ČSN 303-5 only for overheating prevention (never for heating up warm service wa-
ter).
The TS 130 - 3/4 A or WATTS STS 20 valves, the sensor of which is placed in the rear of the boiler,
prevent overheating in the following way: if the boiler water temperature rises above 95 °C, the valve
opens and allows water from public water supply system to enter the cooling loop. This water then
absorbs the excessive energy and exits to the sewer. In case that a non-return flap valve has been in-
stalled to the cooling loop water inlet for the purpose of preventing reversed water flow (which might
be caused by pressure drop in the public water supply system), the cooling loop must be fitted with
a 6 – 10 bar safety valve or with an expansion vessel of minimum 4 l volume. The boiler must be
protected against overheating at all times. If not, its damage or burst may occur.

28. Operating instructions

Preparing boilers for operation

Before putting boilers into operation, it is necessary to ensure that the system has been filled with wa-
ter, and air-bled. Wood boilers must be operated in compliance with the instructions stipulated in this
manual so that satisfactory and safe functioning is achieved. They can only be operated by adults.
Instruction manual - GB
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www.atmos.cz
safety valve 6 – 10 bar
non-return
flap valve
expansion tank of min. 4 l volume
non-return
flap valve
GB-25