Lochinvar LOKE8-100, Installation, Commissioning, Maintenance And User Instructions, Page: 20 / 28

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12.0 MAINTENANCE
MAINTENANCE SCHEDULE
Time Interval Once a year as a minimum, every six months in hard water areas.
Performance Check temperature and flow against commissioing data.
Plate pack Check the tightening dimension, and look for any signs of leakage from heat exchanger.
Connections Check general condition, and for any signs of leakage.
Frame Wipe clean all painted parts, and check surfaces for signs of damage - “touch up” if necessary .
Bolts & bars Check for rust, and clean. Lightly coat threaded parts with molybdenum grease, or a
corrosion inhibitor (ensure that no grease, etc. falls onto the plate gaskets).
Electrical Check the security of all electrical connections and inspect the wiring for damage.
DRAINING DHW WATER SYSTEM
The LOKE and associated storage vessel (if fitted) must be drained if it is to be shut down and exposed to freezing temperatures.
Maintenance and service procedures may also require draining the water heater.
1. Unplug or turn off the LOKE electrical disconnect switch.
2. Connect a hose to the system drain valve.
3. Locate hose’s discharge in an area where hot water will not cause any damage or injury.
4. Close the cold-water inlet valve from the header tank or unvented kit unit to water heater system.
5. Open the drain valve.
6. Working systematically from the highest point in the system, open outlets to allow the system to drain.
7. Close all outlets.
8. If the water heater is being drained for an extended shutdown, it is suggested the drain valve be left open during this
period.
Note: The heat exchanger cannot be completely drained of water
REFILLING THE SYSTEM
1. Close the drain valve.
2. Open the cold-water inlet valve from the header tank or unvented kit to the water heater system.
3. Working systematically towards the highest point in the system, open all outlets and allow any trapped air to escape.
4. Follow the commissioning instructions as detailed in commissioning and testing .
5. Check for water leakage and airlocks, remedy as necessary.
RELIEF VALVE
At least once a year, the pressure relief valve should be checked to ensure correct operation. To check the valve, the manual
override lever should be operated several times. The valve should seat properly and operate freely.
If water does not flow, drain the water heater, remove the inoperative valve and inspect for obstructions or corrosion. Replace with
a new valve of equivalent size as necessary.