ECH 200 BD
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4.5 Physical quantities and units of measurement
4.5.1 Temperature- or pressure-based operation
Parameter Pa H49 may be used to select two different types of machine: operated on the basis of temperature or of
pressure.
• If Pa H49= 0, parameters Pa H07=0 (probe AI3 absent), Pa F01 = 3 are forced (operation in response to a request
from the compressor) .
• if Pa H49= 1 (temperature-based operation), parameters Pa HO7, F01 are forced as follows: H07= 1 (probe AI3
operating on the basis of temperature), F01= 3 (operation in response to a request from the compressor). During
defrosting, Pa d08 will be used as the defrost start temperature, and Pa d09 as the defrost end temperature.
• if Pa H49= 2 (pressure-based operation), parameters Pa H07, F01 will be forced as follows: H07= 2 (probe AI3
operating on the basis of pressure), F01= 0 (proportional operation). During defrosting the following parameters are
used: Pa d02 as the defrost start pressure and Pa d04 as the defrost end pressure.
• If Pa H49= 3, there are no constraints on the parameters.
Pa H49 Pa H07 Pa F01
0 0 probe AI3 absent 3 operation in response to a request from the
compressor
1 1 probe AI3 temperature 3 operation in response to a request from the
compressor
2 2 probe AI3 pressure 0 proportional operation
3 No constraints No constraints
4.5.2 Units of measurement
Control temperature may be displayed in:
• degrees °C, with decimal point
• degrees °F without decimal point.
Please remember the connection between the two measurement units: °F = °C x 9/5 + 32
The unit of measurement is determined by setting parameter H52:
Pa H52 Unit of
measurement
0 Degrees °C
1 Degrees °F
Temperature-
based operation
Pressure-based
operation
Temperature- or
pressure-based
operation:
configuration
table
SERIAL KEYB
EXP
CONN A
CONN B
24 25 26
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