© Danfoss | DCS (az) | 2018.10
A
B
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DKRCC.PI.CA0.F2.22 | 2
Wiring Note Caution
Important
Do not dent or deform the bulb of the
thermostat, as doing so could damage
the bulb and cause charge
leakage.
Do not turn any other screws except
screws on the scale plate, on the micro
switch knob and on the terminal block.
Installation
Select an accessible location, where
the thermostat will not be subject
to damage. Mount the KPU 19 on a
bracket or on a completely flat surface.
Mounting on an uneven surface may
cause incorrect thermostat operation.
Use only the mounting holes provided
at the back of the metal housing.
The KPU 19 thermostat and the
sensing bulb can be mounted in any
position.
The sensing element is filled in with
liquid expansion type charging with
no limitations in terms of temperature
at switch body (TS), temperature at
sensing bulb (TB) or temperature at
capillary tube (TC). KPU 19 can operate
in all following conditions:
TS > TB; TS < TB, TS = TB.
Taking into consideration time
constant of the thermostat it is
recommended to install KPU 19 where
temperature is not changing rapidly.
Fast changes of the measured
temperature will cause thermostat
measurements lags behind actual
temperature changes in the
application. Make sure to keep
temperature variable acceleration
within 3 minutes per 1.8 °F at liquid, or
within 18 minutes per 1.8 °F at air. KPU
should be installed in a place in which
harmful environmental conditions like
radiation from sun, lamps or radiator is
minimalized.
Cooling due to the extensive air flow
might affect thermostat performance
as well.
It is recommended to install the
thermostat at a place where vibration
is 1G or less.
Do not make additional holes.
Locking mounting holes must be
fastened at position A as shown in
diagram to the right.
Fastening at position “B” may result
in housing deformation and KPU 19
malfunction.
Voltage [V]
Amps [A]
P.F.
cos Ø
A C
120 240
Resistive load 1 0.5 ~ 16 0.5 ~ 8
Inductive
load
Full load
Amps 0.75 0.5 ~ 16 0.5 ~ 8
Locked
rotor Amps 0.45 96 48
Do not remove cover while power
is supplied as it may cause electrical
shock.
To avoid the possibility of electric
shock and damage to equipment,
disconnect the power supply before
any wiring connections are made.
Never touch current conducting (LIVE)
parts with your fingers or with tools.
Electrical wires should be connected
through the conduit rubber or
alternatively by conduit boss.
All wiring should conform to the
National Electrical Code and to
applicable local regulations.
Use only copper wire.
Use only the terminal screws furnished
in the terminal block.
Do not exceed tightening torque of
10 lb. in. (1.18 Nm).
Do not exceed the thermostat’s
specified electrical ratings.
Do not use impact driver(shock driver).
The terminal block as well as
grounding screw are accessible after
removing the front cover.
General recommendations for
capillary tube and bulb installation:
1. Protect the capillary tube from
damage due to vibration.
a) When the thermostat unit is
mounted directly on the compressor,
the capillary tube must be secured to
the compressor so that both vibrate
together.
b) For mounting otherwise, form
surplus capillary tube into a loose
loop and secure the loop to the base
on which the thermostat is mounted.
2. Leave a little slack in the capillary
tube to help dampen vibration.
3. Avoid sharp bends (with the radius
of 1/2" or less) and bending the capillary
tube at the same point several times,
as these actions can weaken the
material and increase the likelihood of
the tube cracking.
4. Bending of the capillary tube within
1.75" from soldering point with bulb is
not allowed.
5. Form and locate the capillary tube
away from sharp or abrasive objects
that might damage it.
6. For thermostats with room sensor
coils, make sure that placement allows
free airflow around the coil and bulb.
At the same time, ensure that the bulb
is not exposed to drafts from doors, or
to heat radiated from the evaporator
surface. Make sure that the bulb does
not come into contact with a wall
surface. Never mount the thermostat
directly on a cold wall. Instead, mount
the unit on an insulating plate.
7. KPU 19 sensing bulb is made of
copper, copper alloy, silver solder – do
not use it for media which are harmful
for these materials.
Pilot duty: 125 VA; 120/240 V AC
