Filter Dirty Indicator - Mitsubishi Electric Thermoscreens VRF HP Installation, Operation & Maintenance Instructions Manual

Filter Dirty Indicator

The air curtain is fitted with a Filter Dirty Indicator. It is located at
the left-hand end of the outlet grille and signals when the air
curtain inlet grille/filters should be vacuum cleaned or the air
curtain requires servicing.
NB.The filter dirty interval feature on the Mitsubishi Electric remote
controller is not available.
The indicator states are outlined below:
Indicator State
GREEN FLASH
RED ON
RED FLASH
The filter indicator schedule is based on fan operating hours. For the default schedule,
shown schematically below, the inlet grilles should be vacuum cleaned every 240hrs of
fan operation (3 to 4 weeks depending on use) and a full service should take place
every 960hrs of fan operation (4 to 6 months depending on use).
MT2
The factory set default schedule is suitable for most applications. However, the actual
frequency of cleaning required will depend on the environment. Two alternative filter
indicator schedules are available, and can be selected by changing the 'jumper' position
(marked 1, 2 or 3) on the Filter Indicator PCB.
Filter Indicator Schedule
Jumper position
Inlet grille vacuum interval
Filter service interval
T9901075-2-3 UK
Indicator Light
On 0.5s; Off 3s
On permanently
On 0.5s; Off 0.5s
START
240 hrs
RED ON: Quick reset
240 hrs
RED ON: Quick reset
240 hrs
RED ON: Quick reset
240 hrs
RED FLASH: Hold 5s to reset
Half
Period
   
1 2 3
120 hrs
480 hrs
Action Required
None
Vacuum inlet
Service filters
Default
Period
   
1 2 3
240 hrs
960 hrs
Reset Button
N/A
Quick reset
Press for 5s
Double
Period
   
1 2 3
480 hrs
1920 hrs
Page 29 of 38