Thermostats, type KP

Thermostats, type KP
Thermostats,
type KP
REFRIGERATION AND
AIR CONDITIONING
Technical leaflet
Technical leaflet
Thermostats, type KP
Contents
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Regulating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Contact system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Design/ Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Charges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Dimensions and weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2
RD.5D.C4.02
© Danfoss A/S (IC-MC/mr), 12 - 2004
Technical leaflet
Thermostats, type KP
Introduction
KP thermostats are single-pole, double-throw
(SPDT) temperature-operated electric switches.
A KP thermostat can be connected directly to a
single-phase alternating current motor of up to
approx. 2 kW or installed in the control circuit
of direct current motors and large alternating
current motors.
KP thermostats are used for regulation, but can
also be seen in safety monitoring systems. It is
here that the electronic mechanism shows its
superiority.
KP thermostats are available with vapour charge
or with adsorption charge.
With vapour charge the differential is very small.
KP thermostats with adsorption charge are
widely used to give frost protection.
Features
Approvals
Wide regulating range
Can be used for deep freeze, refrigeration
and air conditioning plant
Welded bellows elements mean increased
reliability
Small dimensions
Easy to install in refrigerated counters or
cold rooms.
Ultra-short bounce times
This gives long operating life, reduces wear
to a minimum and increases reliability.
CE-marked in accordance with EN 60947-4/-5
for sale in Europe.
GL, Germanischer Lloyd, Germany
© Danfoss A/S (IC-MC/mr), 12 - 2004
Standard versions with changeover switch
Possible to obtain opposite contact function
or to connect a signal.
Electrical connection at the front of the unit
Facilitates rack mounting.
Saves space.
Suitable for alternating and direct current
Cable entry of soft thermoplastic for cables
from 6 to 14 mm diameter.
Extensive and wide range
BV, Bureau Veritas, France
LR, Lloyd’s Register, UK
DNV, Det Norske Veritas, Norway
RMRS, Russian Maritime Register of Shipping,
Russia
UL approval for USA and Canada
CCC, China Compulsory Certificate
RINA, Registro Italiano Navale, Italy
Note: Marine Approvals do not cover KP98 dual
thermostat
RD.5D.C4.02
3
Technical leaflet
Thermostats, type KP
Regulating range
KP 61
Vapour range
KP 62
KP 63
KP 68
KP 69
KP 62
Adsorption charge
KP 71
KP 73
KP 75
KP 77
KP 79
KP 81
KP 98 HT
KP 98 OIL
KP 98 OIL
KP 98 HT
−50
Technical data
0
+50
+100
Ambient temperature
−40 → +65°C (+80°C for max. 2 hours).
Switch
Single-pole, double-throw (SPDT) changeover
switch.
Contact load
Alternating current:
AC1: 16 A, 400 V
AC3: 16 A, 400 V
AC15: 10 A, 400 V
Max. starting current (L.R.): 112 A, 400 V
Direct current:
DC13: 12 W, 220 V control current
+150
+200°C
Cable connection
Cable entry for cables 6 → 14 mm dia.
A Pg 13.5 screwed cable entry can be used
for 6 → 14 mm dia. cables.
With 8 → 16 mm cables a standard Pg 16 screwed
cable entry can be used.
Enclosure
IP 30 to EN 60529 / IEC 529
This grade of enclosure is obtained when the
unit is mounted on a flat surface or bracket.
The bracket must be fixed so that all unused
holes are covered.
Properties according to EN 60947:
Wire dimensions
solid/stranded
flexible, w/out ferrules
flexible, with ferrules
flexible, with ferrules
Tightning torque
Rated impulse voltage
Pollution degree
Short circuit protection, fuse
Insulation
IP
4
RD.5D.C4.02
0.75 - 2.5 mm2
0.7 - 2.5 mm2
0.5 - 1.5 mm2
max. 2 NM
4 kV
3
10 Amp
400 V
30/44
© Danfoss A/S (IC-MC/mr), 12 - 2004
Technical leaflet
Thermostats, type KP
Contact systems
KP thermostats
Ordering
Charge
Vapour 1
Adsorbtion 2)
Type
Bulb
type
Setting range
KP 61
A
KP 61
A
KP 98
Differential ∆t
Reset
Max.
bulb
temp.
Capillarytube
length
°C
m
1.5 → 7
aut.
120
2
060L110066
1.5 → 7
aut.
120
5
060L110166
°C
Lowest
temperature
°C
Highest
temperature
°C
– 30 → 15
5.5 → 23
– 30 → 15
5.5 → 23
Code no.
KP 61
B
– 30 → 13
4.5 → 23
1.2 → 7
aut.
120
2
060L110266
KP 61
B
– 30 → 15
5.5 → 23
1.5 → 7
aut.
120
2
060L110366 3)
KP 61
B
– 30 → 15
5.5 → 23
1.5 → 7
aut.
120
2
060L1128663) 4)
KP 61
A
– 30 → 15
Fixed 6
Fixed 2
min.
120
5
060L110466
KP 61
B
– 30 → 15
Fixed 6
Fixed 2
min.
120
2
060L110566
KP 62
C1
– 30 → 15
6.0 → 23
1.5 → 7
aut.
120
KP 63
A
– 50 → – 10
10.0 → 70
2.7 → 8
aut.
120
2
060L110766
KP 63
B
– 50 → – 10
10.0 → 70
2.7 → 8
aut.
120
2
KP 68
C1
– 5 → 35
4.5 → 25
1.8 → 7
aut.
120
KP 69
B
– 5 → 35
4.5 → 25
1.8 → 7
aut.
120
KP 62
C2
– 30 → 15
5.0 → 20
2.0 → 8
aut.
80
060L110666
060L110866
060L111166
2
060L111266
060L1110663) 4)
KP 71
E2
– 5 → 20
3.0 → 10
2.2 → 9
aut.
80
2
060L111366
KP 71
E2
– 5 → 20
Fixed 3
Fixed 3
min.
80
2
060L111566
KP 73
E1
– 25 → 15
12.0 → 70
8.0 → 25
aut.
80
2
060L111766
KP 73
D1
– 25 → 15
4.0 → 10
3.5 → 9
aut.
80
2
060L111866 3)
KP 73
D1
– 25 → 15
Fixed 3.5
Fixed 3.5
min.
80
2
060L113866
KP 73
D2
– 20 → 15
4.0 → 15
2.0 → 13
aut.
55
3
060L114066
KP 73
D1
– 25 → 15
3.5 → 20
3.25 → 18
aut.
80
2
060L114366
KP 75
F
0 → 35
3.5 → 16
2.5 → 12
aut.
110
2
060L112066
KP 75
E2
0 → 35
3.5 → 16
2.5 → 12
aut.
110
2
060L113766
KP 77
E3
20 → 60
3.5 → 10
3.5 → 10
aut.
130
2
060L112166
KP 77
E3
20 → 60
3.5 → 10
3.5 → 10
aut.
130
3
060L112266
KP 77
E2
20 → 60
3.5 → 10
3.5 → 10
aut.
130
5
060L116866
KP 79
E3
50 → 100
5.0 → 15
5.0 → 15
aut.
150
2
060L112666
KP 81
E3
80 → 150
7.0 → 20
7.0 → 20
aut.
200
2
060L112566
KP 81
E3
80 → 150
Fixed 8
Fixed 8
max.
200
2
060L115566
KP 98
E2
OIL: 60 → 120
OIL: Fixed 14
OIL: Fixed 14
max.
150
1
E2
HT: 100 → 180
HT: Fixed 25
HT: Fixed 25
max.
250
2
060L113166
1
) Bulb must always be placed colder than the thermostat housing and capillary tube. The thermostat will then regulate
independent of ambient temperature.
2) Bulb can be placed warmer or colder than thermostat housing and capillary tube, but variations from +20°C ambient
temperature will influence the scale accuracy.
3) With manual switch, not isolating switch.
4) Panel mounting model with top plate.
© Danfoss A/S (IC-MC/mr), 12 - 2004
RD.5D.C4.02
5
Technical leaflet
Thermostats, type KP
Ordering
(continued)
Thermostat bulb types
6
A
Straight capillary tube
B
∅ 9.5 × 70 mm remote air coil
C
C1: ∅ 40 × 30 mm air coil
C2: ∅ 25 × 67 mm air coil
(integral with thermostat)
D
D1: ∅ 10 × 85 mm double contact remote bulb
D2: ∅ 16 × 170 mm double contact remote bulb
Note! Cannot be used in sensor (bulb) pocket
E
E1: ∅ 6.4 × 95 mm remote bulb
E2: ∅ 9.5 × 115 mm remote bulb
E3: ∅ 9.5 × 85 mm remote bulb
F
∅ 25 × 125 mm remote duct coil
RD.5D.C4.02
© Danfoss A/S (IC-MC/mr), 12 - 2004
Technical leaflet
Thermostats, type KP
Design
Function
Vapour charge
Key sketch of KP thermostats
1.
2.
3.
7.
8.
9.
12.
13.
14.
15.
16.
17.
Temperature setting spindle
Differential setting spindle
Main arm
Main spring
Differential spring
Bellows
Switch
Terminals
Earth terminal
Cable entry
Tumbler
Sensor
Adsorption charge
The switch in the KP has a snap-action function
and the bellows move only when the cut-in or
cut-out value is reached.
© Danfoss A/S (IC-MC/mr), 12 - 2004
RD.5D.C4.02
Adsorption charge
Vapour charge
The design of the KP thermostat affords the
following advantages:
high contact load
ultra-short bounce time
vibration resistance up to 4 g
in the range 0-1000 Hz
long mechanical and electrical life.
7
Technical leaflet
Thermostats, type KP
Design
Function
(continued)
1.
3.
5.
7.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Temperature setting spindle, OIL
Main arm
Temperature setting spindle, HT
Main spring
Bellows
Capillary tube, OIL
Capillary tube, HT
Switch
Terminals
Earth terminal
Cable entry
Tumbler
Sensor (bulb)
Locking plate
Terminology
KP 98, dual thermostat
Dual thermostat KP 98 is used to provide
protection against excessively high discharge
gas temperature and to ensure a suitable oil
temperature in the compressor.
To avoid the temperature of the hot gas
exceeding the maximum permissible value
during extreme operating conditions (low
evaporating pressure, high condensing pressure,
high suction vapour superheat) a KP 98
thermostat can be used on the high temperature
side (HT). If the temperature of the hot gas
becomes too high the refrigerant will break down
and the compressor discharge valve will become
damaged.
The risk is greatest in refrigeration systems that
operate on a high compression ratio (e.g. in
systems with NH3 or R22) and in applications with
hot gas bypass.
This unit has two separate thermostat functions.
The HT sensor that controls the discharge gas
temperature is fitted on the discharge tube
immediately after the compressor.
For larger compressors, the sensor can be built
into the discharge line.
The OIL sensor that controls the oil temperature
is located in the compressor oil sump.
Differential
The differential is the difference between the
make and break temperatures.
A differential is necessary for satisfactory
automatic operation of the plant.
Reset
1. Manual reset:
Units with manual reset can only be restarted
after the reset button has been activated.
On min. reset units the set value is equal to
the cut-out value for falling temperature.
On max. reset units the set value is equal to
the cut-out value for rising temperature.
Mechanical differential (intrinsic differential)
The mechanical differential is the differential set
by the differential spindle.
Operating differential (thermal differential)
The operating differential is the differential
the plant operates on. Operating differential is
the sum of the mechanical differential and the
differential produced by the time constant.
8
RD.5D.C4.02
2. Automatic reset:
These units are automatically reset after
operational stop.
© Danfoss A/S (IC-MC/mr), 12 - 2004
Technical leaflet
Thermostats, type KP
Setting
Thermostats with automatic reset
Set the upper activating temperature on the range
scale.
Set the differential on the "DIFF" scale.
The temperature setting on the range scale will
then correspond to the temperature at which the
refrigeration compressor will be started on rising
temperature. The compressor will be stopped
when the temperature has fallen in relation to the
differential setting.
Note that the differential depends on the range
setting. Therefore, the differential scale
must only be used as guideline.
If with low stop temperature settings the
compressor will not stop, check whether the
differential is set at too high a value!
Charges
Thermostats with minimum reset
Set the stop temperature on the range scale.
The differential is a fixed setting.
The compressor can be restarted by pressing
the "Reset button" after the temperature on the
thermostat sensor has risen by a value equal to
the fixed differential setting.
Thermostats with maximum reset
Set the stop temperature on the range scale.
The differential is a fixed setting.
The compressor can be restarted by pressing
the "Reset button" after the temperature on the
thermostat sensor has fallen to a value equal to
the fixed differential setting.
1. Vapour charge
9. Bellows element
17. Sensor (bulb)
19. Capillary tube
Here the interdependence between the pressure
and temperature of saturated vapour is utilized,
i.e. the element is charged with saturated vapour
plus a small amount of liquid.
The charge is pressure-limited; a further increase
in pressure after evaporation of all the liquid in
the sensor (17) will only result in a small pressure
increase in the element.
This principle can be utilized in thermostats for
low temperature, etc. where evaporation must be
able to take place from the free liquid surface in
the sensor (within the operating range of the
thermostat), and where at the same time, the
bellows must be protected against deformation
when kept at normal ambient temperatures.
Since the pressure in the element depends on
the temperature at the free liquid surface, the
thermostat must always be placed so that the
sensor is colder than the rest of the thermostatic
element.
The evaporated liquid will recondense at the
coldest point, i.e. the sensor. Thus, as intended,
the sensor becomes the temperature-controlling
part of the system.
Note: When the sensor is coldest, the ambient
temperature has no effect on regulating accuracy.
2. Adsorption charge
In this case the charge consists partly of a
superheated gas and partly of a solid having a
large adsorption surface.
The solid is concentrated in the sensor (17) and
it is therefore always the sensor that is the
temperature-controlling part of the thermostatic
element.
The sensor can be placed warmer or colder
than thermostat housing and capillary tube, but
variations from +20°C ambient temperature will
influence the scale accuracy.
9. Bellows element
17. Sensor (bulb)
19. Capillary tube
© Danfoss A/S (IC-MC/mr), 12 - 2004
RD.5D.C4.02
9
Technical leaflet
Thermostats, type KP
Dimensions and weights
Weight
KP 61-81: approx. 0.4 kg
KP 98: approx. 0.6 kg
KP 61-81
Mounting holes (back of KP)
Mounting holes (back of KP)
KP 98
Wall bracket
A:
KP 61,
KP 63
10
B:
KP 61,
KP 63,
KP 69
C1:
KP 62,
KP 68
C2:
KP 62
RD.5D.C4.02
D2:
KP 73
Angle bracket
E2:
KP 71
E3:
KP 77
KP 73
KP 75
KP 77
KP 98
D1:
KP 73
KP 79
KP 81
E1:
KP 73
F:
KP 75
© Danfoss A/S (IC-MC/mr), 12 - 2004
Technical leaflet
Thermostats, type KP
© Danfoss A/S (IC-MC/mr), 12 - 2004
RD.5D.C4.02
11
Technical leaflet
Thermostats, type KP
12
RD.5D.C4.02
© Danfoss A/S (IC-MC/mr), 12 - 2004
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