3 Water Level Control
Page 66 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
3.9.3 Test Outputs and Shunt Switch
The test input terminal TST can be used to check the auxiliary alarm outputs or the shunt switch
operation when the burner is firing. The table below shows the expansion options for the test input.
Expansion Option Description
21 Function of test input
22 Shunt switch – time to 1
st
low
23 Shunt switch – time to 2
nd
low
When the test input is set for auxiliary alarm outputs checks, hold the test input continuously to cycle
through the alarm outputs every two seconds.
For shunt switch test, there is time delay for the burner to reach 1
st
low set in expansion option 22,
allowing the operator to decrease the water level to check the 1
st
low alarm. If the water does not drop
to 1
st
low within this time, the shunt switch test is cancel and the MM reverts to normal operation. There
is additional delay set in expansion option 23 to allow the operator to decrease the water to 2
nd
low to
check the 2
nd
low alarm. If the water level does not drop in this time, the MM leave shunt switch mode
and the burner will turn off. The timer will display for when doing these tests, as shown below. After
reaching 2
nd
low, if the water level does not rise to control point within 10 minutes, alarms will occur.
The alarm outputs and shunt switch can also be checked via the Water Level Status screen on the MM.
Figure 3.9.3.i Trigger Shunt Switch
Press to cycle the alarm outputs every 2 seconds, and press to check the water
level alarms as described above.
To Next Page
Loading...
Need help?
General
