Danfoss KPU 6B, KPU 6W, KPU 5, KPU1B, KPU1 Installation guide
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Installation guide
Pressure switch
KPU
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Application |
Refrigerants: |
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KPU pressure switches are for use on commercial |
R22, R134a, R404A, R407A, R407C, R407F, R410A*), R422B, |
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refrigeration and air conditioning systems to give protection |
R422D, R438A, R448A, R449A, R450A, R452A, R507A, R513A |
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against excessively low suction pressure or excessively |
For complete list of approved refrigerants, go to |
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high discharge pressure. |
http://products.danfoss.com/all-products/ |
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They are also used for starting and stopping refrigeration |
*) R410A only for KPU 6W and KPU 6B |
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compressors and fans on air-cooled condensers. |
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KPU pressure switches are fitted with the Single-Pole Single- |
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Throw (SPST) or Single-Pole Double-Throw (SPDT) switches, |
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suitable for direct as well as indirect (with a contactor) control. |
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KPU pressure switches are available in several pressure ranges |
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and are compatible with refrigerants listed below. KPU 6W and |
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KPU 6B are fail safe switches for high pressure refrigerants. |
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Standard enclosure is ~NEMA 1. |
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Product Specification
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Code number |
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Contact system |
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Max. |
Max. |
Ambient |
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Regulating |
Differential |
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36 in. cap. |
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working |
testing |
temp. |
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Application |
Type |
¼ in |
Reset |
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Switch |
range |
∆p |
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pressure |
pressure |
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tube w. ¼ |
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Type |
[inHg] [psig] |
[psi] |
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male flare |
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action |
[psig] |
[psig] |
[°F] |
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in flare nut |
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KPU 1 |
060-5231 |
060-5233 |
Auto. |
SPDT |
— |
6 in. – 108 |
10 – 60 |
250 |
290 |
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Low Pressure |
KPU 1 |
060-5236 |
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Auto. |
SPST(NO) |
close High open Low |
6 in. – 108 |
10 – 60 |
250 |
290 |
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Switch Cut Out |
KPU 2 |
060-5237 |
060-5235 |
Auto. |
SPST(NO) |
close High open Low |
6 in. – 73 |
6 – 30 |
250 |
290 |
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on pressure |
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-40 – 122 |
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fall |
KPU 2 |
060-5239 |
060-5240 |
Auto. |
SPDT |
— |
6 in. – 73 |
6 – 30 |
250 |
290 |
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(175 for |
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KPU1B |
060-5232 |
060-5234 |
Man (Min.) |
SPDT |
— |
28 in. – 100 |
10 fixed |
250 |
290 |
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max. |
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2 hours) |
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Fan switch |
KPU 5 |
060-5241 |
060-5242 |
Auto. |
SPST(NO) |
close High open Low |
100 – 465 |
25 – 85 |
510 |
530 |
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High Pressure |
KPU 6W |
060-5243 |
060-5245 |
Auto. |
SPDT |
— |
100 – 600 |
58 – 145 |
675 / 610* |
725 |
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Switch |
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Cut Out on |
KPU |
060-5244 |
060-5246 |
Man. (Max.) |
SPDT |
— |
100 – 600 |
60 fixed |
675 / 610* |
725 |
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pressure rise |
6B |
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* 610psig - MWP for products used according to 2014/68/EU PED directive.
Installation
Select an accessible location, where the switch and pressure connection line will not be subject to damage.
IMPORTANT:
Mount the pressure switch in a position that will allow drainage of liquids away from switch bellows. Pressure connection of the switch must always be located on the top side of the refrigerant line.
This reduces the possibility of oil, liquids, or sediment collecting in the bellows, which could cause the switch malfunction.
IMPORTANT:
Ensure the ambient temperature for the pressure switch is higher than the refrigeration line as that will prevent liquid migration and accumulation in the bellows.
<![endif]>060R9767
© Danfoss | DCS (sb) | 2019.12 |
AN212086434305en-000101 | 520H11543 | 1 |
Mount the KPU pressure switch on a bracket or on a completely flat surface.
Mounting to an uneven surface might cause improper switch operation.
For bracket mounting use only the 10-32x3/16 screws provided with the switch. If other screws are used function of the pressure switch might be disturbed (they may not protrude into the switch more than 1/8 in.).
Use only the mounting holes provided; no other holes are to be added to the switch.
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
switches to the refrigeration system through a capillary tube.
Screws for |
Mounting holes |
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bracket mounting |
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for flat surfaces |
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Recommendations for capillary tube and flare connections:
1.Ensure self-draining of the capillary tube to minimize clogging.
2.Coil excess capillary tube into smooth, circular coils (approx. 3 inch 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 switches.
8.Do not over tighten flare nuts as it may damage the threads causing leaks.
9.Protect the capillary tube from damage caused by vibrations from compressor:
–when the switch unit is mounted directly on the compressor, the capillary must be secured to the compressor so that everything vibrates as a whole.
–when the switch is mounted remote from the compressor, make the pressure connections away from the compressor.
–when the switch 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 switch.
7.Always use two wrenches tightening the flare nut on the pressure switch. One wrench should support the connector while the second wrench is used to tighten the nut.
NOTE:
After installing the pressure switch, evacuate the plant in accordance with applicable EPA and other regulations, to remove air, moisture, and other contaminants.
Wiring
Electrical ratings according to UL regulations
120 V AC |
24 FLA, 144 LRA – make only |
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240 V AC |
24 FLA, 144 LRA – make only |
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240 V DC |
12 W pilot duty |
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European electrical ratings according to EN 60947
AC1 |
AC3 |
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AC15 |
LR |
DC13 |
16 A |
16 A |
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10 A |
112 A |
12 W |
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400 V |
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220 V |
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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 switch.
The terminal block as well as grounding screw
are accessible after dismounting of the front cover.
2 | 520H11543 | AN212086434305en-000101 |
© Danfoss | DCS (sb) | 2019.12 |
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