Varmeteknikk AS
Phone +47 23 37 55 00 November 2021
V2
15
Maintenance
DO NOT START REPAIR AND MAINTENANCE UNTIL THE BOILER IS
DISCONNECTED
To avoid unnecessary downtime, the boiler should be inspected annually. This can
advantageously be done before the boiler is put into operation in the autumn. The inspection
should include the following points:
-
Check the boiler for leakage
Check return sockets as well as draining and expansion. Also check for leaks from element.
Leakage from here can be difficult to detect and the damage can be significant if the leak is not
detected at an early stage.
- Control of elements
The condition of the heating elements is checked by resistance measurement / megging.
Possibly defective element(s) must be replaced to avoid errors in the effect groups.
- Contactors / relays
Check the contact set on the contactors and that these make/brake contact.
Possible noise from the contactors may indicate wear and should be checked carefully or
replaced. Worn contactors can burn fixed and cause great damage.
- Electrical connections
All connections on busbars, power switches, contactors and elements are tightened with
correct torque.
- Regulator
Controller is function tested and power groups are checked.
- Safety thermostat
The safety thermostat is checked. By stopping the pump or closing the valves, you will
quickly reach the trigger temperature to test if the safety thermostat trips.
REPAIR AND MAINTENANCE MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL
Varmeteknikk AS can be helpful with and spare parts.
Tightening torques:
Parts
Screw dimension
Tightening torques
Contactor AF09
– AF16
M3,5
1,2 Nm
Contactor AF26
– AF30
M4
2,5 Nm
Contactor AF40, AF52, AF65
M6
4 Nm
Contactor AF80, AF96
M8
6 Nm
Contactor AF116, AF 140
M8
8 Nm
Element connections
M4
1,2 Nm
Clampdisc for elements
M12
12-15 Nm
Conductors to copper bars
M6
10 Nm
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
