26. 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)
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 water).
The TS 131 - 3/4 ZA 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 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 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.
27. 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 can only be operated by adults.
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 (DC15E excluded) for the ignition (to minimum - 0 °C). Through
the top door /2/ insert dry wood kindling on the heatproof shaped piece /5/. Place the kindling per-
pendicularly 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 waste gas passage. Place paper or wood wool on top of the kindling,
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
To Next Page
Loading...
