2
DKRCC.PI.CD0.F1.22 / 520H6076
© Danfoss A/S (AC-MCI / jmn), 2012-12
Mount the KPU pressure control on a bracket
or on a completely flat surface.
Mounting to an uneven surface might cause
improper control operation.
For bracket mounting use only the 10-32x3/16
screws provided with the control. If other screws
are used function of the pressure control might be
disturbed (they may not protrude into the control
more than
1
/
8
in.).
Use only the mounting holes provided;
no other holes are to be added to the control
IMPORTANT:
Pressure pulsations in the refrigeration system
reduce life time of the bellows and might
disturb switch function. Pressure pulsations
should always be effectively damped e.g.
by connection the pressure controls to the
refrigeration system through a capillary tube.
Screws for bracket
mounting
Mounting holes
for flat surfaces
1.
Ensure self-draining of the capillary tube
to minimize clogging.
2.
Coil excess capillary tube into smooth, circular coils
(approximately 3 in. diameter). The coiled tube should
be securely fastened in order to prevent possible
damage due to vibration.
3.
Leave a little slack in the capillary tube as it helps
to damp mechanical vibrations.
4.
Avoid sharp bends as well as re-bending of the capillary
tube on the same point as it weakens the material,
increasing the risk of crack.
5.
Never allow for contact between the capillary tube
and sharp or abrasive objects as during vibrations
the tube could be damaged due to friction.
6.
Purge the piping before connecting pressure controls.
7.
Always use two wrenches
tightening the flare nut on
the pressure control.
One wrench should support
the connector while
the second wrench
is used to tighten the nut.
8.
Do not over tighten flare nuts as it may damage the
threadscausing leaks.
9.
Protect the capillary tube from damage
caused by vibrations from compressor:
– when the control unit is mounted directly on the
compressor, the capillary must be secured to the
compressor so that everything vibrates as a whole.
– when the control is mounted remote from the
compressor, make the pressure connections away
from the compressor.
– when the control is mounted remote from the
compressor and the pressure connections have to be
on the compressor, then damping coils must be used
between the compressor and the pressure control.
NOTE:
After installing the pressure control, evacuate
the plant in accordance with applicable EPA
and other regulations, to remove air, moisture,
and other contaminants.
Recommendations for capillary tube and flare connections:
Wiring
CAUTION:
Disconnect power supply before wiring connections
are made or service to avoid possible electrical shock
or damage to equipment. Do never touch live parts
with your fingers or with any tool.
NOTE:
All wiring should conform to the National Electrical
Code and local regulations. Use copper wire only.
Use terminal screws furnished in the contact block.
Do not exceed tightening torque 20 lb. in (2.3 Nm).
Do not exceed electrical ratings for the control.
Electrical ratings according to UL regulations
European electrical ratings according to EN 60947
120 V a.c.
24 FLA, 144 LRA – make only
240 V a.c.
24 FLA, 144 LRA – make only
240 V d.c.
12 W pilot duty
The terminal block as well as grounding screw
are accessible after dismounting of the front cover.
AC1
AC3
AC15
LR
DC13
16 A
16 A
10 A
112 A
12 W
400 V
220 V
