Daikin ERQ Series, Service Manual

Page: 86 / 153

EKEQ EKEQDCBV3
Option kit for combination of Daikin condensing units
with field supplied air handling units
4P383212-1 - 2014.08
Installation and operation manual
77
I
NSTALLATION OF THERMISTORS
Refrigerant thermistors
Location of the thermistor
A correct installation of the thermistors is required to ensure a good
operation:
1. Liquid (R2T)
Install the thermistor behind the distributor on the coldest pass
of the heat exchanger (contact your heat exchanger dealer).
2. Gas (R3T)
Install the thermistor at the outlet of the heat exchanger as close
as possible to the heat exchanger.
Evaluation must be done to check if the air handling unit is protected
against freeze-up. This must be done during test operation.
The thermistor needs to be installed in an enclosed area. Install it
inside the air handling unit, or shield it to prevent it from getting
touched.
Installation of the thermistor cable
1 Put the thermistor cable in a separate protective tube.
2 Always add a pull-relief to the thermistor cable to avoid strain on
the thermistor cable and loosening of the thermistor. Strain on
the thermistor cable or loosening of the thermistor may result in
bad contact and incorrect temperature measurement.
Fixation of the thermistor
1 Fix the thermistor with insulating aluminum tape (field supply) in
order to ensure a good heat transference.
2 Put the supplied piece of rubber around the thermistor
(R2T/R3T) in order to avoid loosening of the thermistor after
some years.
3 Fasten the thermistor with 2 tie wraps.
4 Insulate the thermistor with the supplied insulation sheet.
1 Liquid R2T
2 Gas R3T
1 2
Put the thermistor wire slightly down to avoid water
accumulation on top of the thermistor.
Make good contact between thermistor and air
handling unit. Put the top of the thermistors on the air
handling unit, this is the most sensitive point of the
thermistor.
2 1
1 Most sensitive point of the thermistor
2 Maximize the contact