Honeywell DHC, Service Manual

Page: 241 / 262

SDC / DHC Hydraulic Components
EN2H-0221GE51 R0812 241
Emission measurement can be terminated at any moment in
advance with the key.
Safety temperature limiter check may be performed only by the
technician
By keeping the input button

pressed during an emission
measurement, the integrated heat generator maximum
temperature limit is bypassed and the heat generator remains in
operation continuously until the safety temperature limiter (STL) is
triggered. During the safety temperature limiter check, all the
consumers are separated from the heat generator, i.e. any
available mixed heating valve is closed and all the heating and
hot-water loading pumps are stopped. The emission
measurement is continued from the moment of termination with
the previously saved remaining time.
Safety temperature limiter check by the heating technician
Release the input button. The emission measurement still active
is stopped with the key.
7.3.13.3 Relay/function test
Depending on the controller version, various outputs can be
tested. This is not only a relay test, but a function test by means
of which the hydraulic components are tested. The partially
compulsory sequence of the switching procedures is considered
here.
After selecting the test function, the relevant relays can be
switched one after the other by pressing the input button

in the
specified switching sequence.
Heat generator test
Cancellation
Safety check
Function
Application
Cancellation
Function
Heat generator