Herz STOCKHOLM, Инструкция, Страница: 8 / 26

HERZ HIU STOCKHOLM
Page 8
Thermostatic bypass valve
Routine servicing
– Check all connection seals, remove the head, check the insert for leaks and
action the insert drive pin.
Zone valve
Routine servicing
– Check all connection seals, remove the actuating drive by depressing release
button on the side of the actuator and lift clear, check the insert for leaks and action the insert drive
pin and replace actuator which clicks into place.
Actuating drive
Routine servicing
– Check action when electric signal sent (calling for heat)
Component replacement
– Isolate electric power and disconnect actuator, remove from valve
body by depressing release button on the side of the actuator and lift clear. Replace actuator which
clicks into place and reconnect wiring.
Ball valves (if fitted)
Routine servicing
– Operate valves regularly and check all connection seals.
Strainers
Routine servicing
– Check all connection seals, drain the pipe work, remove strainer cap and
check strainer basket.
Tempering Valve
Routine servicing
– Check all connection seals, drain the domestic hot water. Undo the
connection nuts and remove the valve, check the non-return valves and strainer gaskets, clean or
replace if necessary.
Component replacement
– Drain the domestic hot water and replace the valve and strainer
gaskets.
Differential Pressure Control Valve
Routine servicing
– Check all connection seals
Component replacement
– Drain the primary, undo the capillary retaining nut and replace the
valve, then reconnect the capillary.
Pressure gauge
Routine servicing
– Check all connection seals, check operation of the needle down to zero and
back up when the secondary is being drained and refilled.
Component replacement
– Drain the secondary side of the unit, unscrew the gauge and replace
Thermostatic head with contact sensor
Routine servicing
– not required
Component replacement
– Drain the domestic hot water. Remove the screws from the bracket
which secures the contact sensor and lift clear. Undo the connection nut and remove the sensor
probe also removing the thermostatic head from the valve. Refit the head and smear the contact
sensor with silicone grease before inserting back into position. Then refit the connection nut having
replaced the seal. Reposition the bracket over the contact sensor and replace the screws.