DORCHESTER DR-FC 25, Installation, Commissioning And Maintenance Instructions

Page: 89 / 98

Introduction
Instruction Manual DR-FC 89
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11 Maintenance
frequency
11.1 Introduction
A service should be carried out at least once a year, both on the water side and
on the gas side. Maintenance frequency depends, among other things, on the
water quality, the average burning time per day and the set water temperature.
n
Remark
Regular maintenance extends the service life of the water heater.
n
Remark
To determine the correct maintenance frequency, it is recommended to
arrange for the service and maintenance engineer to check the water heater
on both the water and gas side, three months after installation. Based on this
check, the best maintenance frequency can be determined.
11.2 Determining service
interval
To aid servicing, the control panel has a service interval which defines the
frequency of maintenance by the service and maintenance engineer based on
the number of burning hours.
The service interval can be set to: 500, 1000 or 1500 burning hours. The
standard setting is 500 burning hours.
Example
In the first three months, the water heater has burnt 300 hours. During
maintenance, it is evident that one service per year will be sufficient. So after
one year, some 1200 burning hours will have elapsed. The first value below
1200 hours that can be selected is 1000 burning hours.
In this case, the service and maintenance engineer sets the interval to 1000.
Example
In the first three months, the water heater has burnt 300 hours. During
maintenance, it is evident (perhaps due to the water quality) that service will be
required at least once every 6 months. So after six months, some 600 burning
hours will have elapsed. The first value below 600 hours that can be selected is
500 burning hours.
In this case, the service and maintenance engineer sets the interval to 500.
Once the set number of burning hours has elapsed, the message
SERVICE REQUIRED
will appear on the display. See Figure 11.1 . Once the
message appears. contact should be made with the service and maintenance
engineer.
!!! WARNING !!!
MAX. BURNINGHOURS:
SERVICE REQUIRED
Figure 11.1 Service required
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