WDS
Operation, Maintenance and Installation Manual
Issue 11
Page
26
14/02/2019
5.3
Recommended Preventative Maintenance Schedule
(to be performed by qualified maintenance personnel)
To be performed
THREE TIMES YEARLY
for devices in constant day and night use and
HALF YEARLY
or
YEARLY
for devices in
lesser usage situations
WARNING 240-415 VOLTS
ISOLATE DEVICE FROM ELECTRIC SUPPLY BEFORE SERVICING
1.
Remove top and side panels and front bottom panel behind detergent door
Note:
Panel removal
i)
Remove 4 self-tapping screws on the top panel
ii)
Lift the side panel up to remove
iii)
Remove 2 x 3/16” screws from bottom front panel
Note: Control lockout switches are mounted under the top panel and behind electrical access door. Device will not
operate if switch is open circuit
2.
Remove and clean the sprays in sequence (do not mix sprays with other spray groups). Chamber top to bottom. Cool down
sprays x 2, Top sprays x 4, Bottom sprays x 4, Pan Tip sprays x 2 and rotary nozzles x 2. Door Urine bottle sprays x 4 – check
that the holes are clear and clean as necessary (hold under tap and pressurise or clean in ultrasonic cleaner). In areas with
hard water or high minerals in water supply, chemical de-scalar may be the quickest and easiest means to remove build up
of deposits. Replace before removing next spray group
3.
Check condition of Rack positioning magnets
Note: Replace magnets annually
4.
Check hinge screws for tightness on pan rack and bowl rack
5.
Check condition of door gasket
6.
Steam generator: Check for scale build up inside element housing and water tank. Remove and clean temperature probe
and water level sensors
7.
Water Tank: Check for scale build up inside tank and on element. Remove and clean temperature probe and water level
sensor
8.
Remove and clean temperature probe at steam outlet
9.
Water inlet solenoids: Check filters for material build up, clean if necessary
10.
Make sure the water fill solenoids are completely shutting off and levels are not creeping up, if so, clean and/or replace the
solenoid
11.
Detergent pump: Check hose on pump and hoses in detergent lines for cracks
12.
Load Cell detergent bottle: Remove detergent bottle, unscrew load cell mounting plate being careful that the wire to load
cell aren’t strained when inspecting load cell. Clean any detergent residue from under plate. Check load cell for corrosion,
lightly spray with WD40
13.
Before replacing panels run purge reset cycle three times to clear any airlocks in spray lines and check for leaks. Dust down
components if necessary. Replace all panels
14.
Cycle verification: Run the 3 cycle options starting with Bedpan/Urinal bottles. Download logger data to PC; print a report
of the last 3 cycles. Check temperatures attained and wash cycle times are within the operating requirements
15.
Replace battery on processor PCB every 12 months. Check time and date, adjust if required
Malmet will make available on request circuit diagrams, component parts lists, descriptions, calibration instructions, or
information which will assist the user’s appropriately qualified technical personnel to repair those parts of the device
