212-M-V2.1
26 Operation
3.5 OFFSET FUNCTIONS
The offset function is designed for air conditioning systems with a very low
∆t.Often, in these systems, a bypass valve is installed to enable any
differences in the feed and return temperature to be zeroed out.
To compensate for any offset in the temperature sensors the Model 212 must
be put into the Set-up Program mode. The bypass valve "A" is then opened
and the valves "B" and "C" are closed.
With offset selected, the user then enters YES to zero the offset between the
feed and return lines. The measured offset will then be displayed on the
Model 212, the value of which will be stored when the Set-up Mode is exited.
The system is then returned to normal by closing valve "A" and opening valves
"B" and "C".
T
T
Flowmeter
Temperature
Sensor
Temperature
Sensor
212
LOAD
B
C
Feed Line
Return Line
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