Compressor Thermal Protector; Checking Procedures - Daikin altherma 3 M Service Manual

3 | Components

3.8 Compressor thermal protector

3.8.1 Checking procedures

To perform a mechanical check of the compressor thermal protector
Service manual
146
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
Prerequisite: Remove the compressor insulation.
1 Remove the compressor thermal protection with bracket from the
compressor.
a b
a Compressor thermal protector
b Bracket
c Compressor
2 If in doubt, measure the temperature of the compressor thermal protection.
Result: The temperature MUST be below 104°C.
3 Using a hot air gun, carefully heat the compressor thermal protection to
slightly above 132°C (compressor thermal protection trips at 126~132°C).
INFORMATION
Make sure that the wiring between the compressor thermal protector connector and
the connector on the PCB is properly connected and NOT damaged (check
continuity), see
For single phase units ONLY: Make sure that the high pressure switch (which is wired
in series with the compressor thermal protector) functions correctly, see
"3.11.1 Checking
4 Disconnect the compressor thermal protector from the intermediate
connector and measure the resistance between pins 1‑2.
Result: The contact MUST be open (measured resistance = OL).
5 Let the compressor thermal protection cool down below 104°C (reset
temperature is 104~116°C).
6 Again measure the resistance between the pins 1‑2 of the connector of the
compressor thermal protector.
Result: The contact MUST be closed (measured resistance = 0 Ω).
c
"6.2 Wiring diagram" [ 4 314].
procedures" [ 4 157].
4
"3.17 Plate work" [ 230].
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03