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GB-21
GB
Instruction manual - GB
22. Connection of overheat protecting cooling loop with a safe-
ty valve Honeywell TS 131 - 3/4 ZA or WATTS STS20
(valve opening temperature 95 - 97 °C)
CAUTION
– in compliance with the EN ČSN 303-5, the cooling loop must not be used for
any other purpose than overheat protection (never for heating hot potable water).
The TS 131 - 3/4 ZA valve or WATTS STS 20 valve, the sensor of which is placed in the rear
of the boiler, prevents 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 installed 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 bars safety valve or with an expansion vessel of minimum 4 l volume.
23. Operating instructions
Preparing boilers for operation
Before putting boilers into operation, it is necessary to ensure that the system has been filled with
water, 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 should only be operated by
adult persons who have suitable qualifications and permissions in compliance with effective regula-
tions of the particular country.
Ignition and operation
Before fuel ignition, open the ignition valve /13/ by pulling the ignition valve pulling rod /17/ and
reduce the waste gas thermostat to the “ignition” value (to minimum - 0 °C). This will switch on the
exhaust fans of the boiler and open the primary air inlet. Through the top door /2/ insert dry wood
kindling on the heatproof shaped piece /5/. Place the kindling perpendicularly to the channel recess
in the shaped piece so that a 2 – 4 cm gap between the recess and fuel is created; which allows the
Honeywell TS 130– 3/4 A (95°C) valve
WATTS STS 20 (97°C)
sewer
filter
valve
water supply from
public water system
pressure: 2 - 6 bar
temperature: 10 – 15°C
safety valve 6 – 10 bar
non-return
flap valve
non-return
flap valve
expansion tank of min. 4 l volume
