| Вид документа | Бюлетень виробу |
|---|---|
| Виробник | JCI |
| Код документа | p28-and-p128-series-lube-oil-control-with-built-in-time-delay-relay-product |
| Група обладнання | P28 and P128 Lube Oil Pressure Control |
| Сторінок | 9 |
| Мова документа | англійська |
| Розмір файлу | 0.5 МБ |
Текст документа
Master Catalog 125
Pressure Controls Section P
Product/Technical Bulletin P28
Issue Date 0622
P28 and P128 Series Lube Oil Controls
with Built-in Time Delay Relay
The P28 and P128 Series Lube Oil Controls provide
dependable and economical oil pressure cutout for
pressure-lubricated refrigeration compressors. The
field-adjustable pressure differential of these controls
provides compressor operation according to the
manufacturer’s specifications. The P28 and P128
controls measure the net lube oil pressure and de-
energize the compressor if the pressure falls below the
differential setpoint.
Manual reset models are available with factory set and
sealed time delays of 30, 45, 60, 90, or 120 seconds.
Not all time delays are available for all models. The
P128 is the same control as the P28 but with 1/4 in.
male flare pressure connections.
Figure 1: P28AA
Features and benefits
Built-in time delay relay with Minimizes timing fluctuations due to temperature
ambient compensation variations
Trip-free manual reset Provides manual reset that cannot be overridden
by pressing and holding the reset button
Replaceable time delay relay Allows easy field replacement of the time delay
assembly relay and terminal board
Available with runlight and Allows the control to be wired for normal oil
alarm terminals pressure runlight signals and shutdown alarm
circuits for remote monitoring of oil pressure
status
© 2022 Johnson Controls 1
Part No. 24-7664-605, Rev. D
Code No. LIT-125420
I ntroduction
Dimensions
! WARNING: Personal injury hazard. All
P28 and P128 controls are
designed as lubrication
protection controls. Failure of
the P28 or P128 could allow
the refrigeration compressor
to be damaged in a way that
may not be apparent upon
visual inspection. Follow
proper procedures and the
compressor manufacturer’s
instructions, as well as any
warning signs on or around
the equipment, when
discharging and
disassembling the
compressor.
Environmental damage
hazard. If leakage of sensed
media such as refrigerant or
oil can be harmful to the
environment, or hazardous in Figure 2: P28 or P128 dimensions, in. (mm)
any way, the user must
provide for proper
containment. O peration
The P28 and P128 controls measure the net oil When the compressor starts, the timer is energized
pressure available to circulate oil throughout a because the net oil pressure of the system is zero.
pressure-lubricated refrigeration system. The net oil During normal operation, the net oil pressure builds
pressure is the difference between the oil pressure up to the pressure switch’s cut-out setting, also
at the pump discharge and the refrigerant pressure known as scale setting, plus the switch differential
in the compressor crankcase. which is 3 psi to 5 psi (21 kPa to 34 kPa), in the
required time delay. This causes the time delay relay
Example: If the oil pressure pump discharge reading to de-energize.
is 90 psi (621 kPa) and the crankcase
pressure is 70 psi (483 kPa), the net oil If the net oil pressure does not rise to the cut-out
pressure is 20 psi (138 kPa). pressure setting plus the switch differential within the
required time delay, the time delay relay trips and
The P28 and P128 have a built-in time delay relay. stops the compressor.
This relay allows the oil pressure to build up for the
time delay period before the compressor trips. This If the net oil pressure drops below the cut-out
also prevents nuisance lockouts due to intermittent pressure setting during the compressor’s run cycle,
loss of oil pressure. The time delay relay is a trip- the time delay relay energizes. If the net oil pressure
free device. The manual reset cannot be overridden returns within the time delay, the time delay relay de-
by pressing and holding the reset button. energizes and the compressor continues to operate
normally. If the net oil pressure does not return
Manual reset models are available with time delays within the time delay, the control shuts down and
of 30, 45, 60, 90, or 120 seconds. The time delay locks out the compressor.
relay is compensated to minimize the effect of
ambient temperature variations. However, the time
delay relay is affected by voltage variations.
2 P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
Example: The bearings require a 9 psi (62 kPa) net Pressure connections
oil pressure, which is the oil pump
pressure minus crankcase pressure. The
installer sets the control scale setting to 9 ! CAUTION: Equipment damage hazard.
psi (62 kPa). The switch differential is 5
psi (34 kPa). Upon initial start of the Avoid sharp bends or kinks in the
compressor, the time delay relay capillary or tubing to avoid damage to
energizes. If the net oil pressure does not the capillary.
build up to 14 psi (97 kPa), or the scale
Coil and secure excess capillary or
setting (9 psi) plus the switch differential
tubing. Because harmonic vibration
(5 psi), during the time delay, the control
can break the capillary or tubing,
breaks the circuit to the compressor. If the
some slack must be provided.
pressure of 14 psi (97 kPa) is reached
during the time delay, the time delay relay Do not allow the capillary or tubing to
de-energizes and the compressor rub against metal surfaces where
continues to operate normally. friction can cause damage.
When using a control with
I nstallation
1/4 in. (6.4 mm) tubing, a pulsation
damper must be used. Pulsation can
cause excessive wear and damage
Mounting the control.
1. Purge all tubing and lines before connecting the
! CAUTION: Equipment damage hazard. pressure control.
A P28AN or P28DN control used for 2. Connect the oil pressure line pump discharge to
ammonia service must be mounted the pressure connector labeled OIL.
separately from the electrical cabinet.
3. Connect the crankcase pressure line to the
An ammonia leak could damage the
pressure connector labeled LOW.
electrical circuitry.
4. Coil and secure the excess capillary or tubing to
Use only the mounting screws
avoid vibration.
supplied with the control. Damage to
internal components may occur if
other screws are used. Wiring
The P28 and P128 controls are not position-
sensitive and you can mount them in any position. ! WARNING: Shock hazard. Disconnect
Use the two mounting screw holes located on the all power supplies before
back of the control case to mount the control directly making wiring connections to
to a wall or panel board. Mount the control so that avoid electrical shock or
the pressure connections on the bellows are above damage to the equipment.
the crankcase liquid level of the equipment being
controlled. Ensure all wiring connections use copper
Note: When mounting the control to a conductors only.
compressor is required, a mounting bracket
Wire in accordance with the National Electric
(Part No. 271-51) is available. Code and local regulations. For the maximum
electrical rating of the control, see the label
inside the control cover.
Use the terminal screws furnished (8-32 x 1/4 in.
binder head). Substitution of other screws may
cause faulty connections.
See Figure 3 to Figure 10 for typical wiring diagrams
or refer to the compressor manufacturer’s
specifications.
P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 3
When the P28 or P128 control is supplied with a When you install a P28 or P128 on a 440 VAC or
Terminal 3, you can wire it to operate a runlight to 550 VAC system, use an external step-down
indicate when there is sufficient net oil pressure. transformer to provide either 120 V or 240 V to the
When the control is supplied with a Terminal A, you pilot and time delay relay circuits. Ensure that the
can wire it to operate a shutdown alarm or signal to transformer is of sufficient volt ampere capacity to
indicate when the compressor has tripped. operate the motor starter and the time delay relay.
Table 1 presents the power requirements for the
For standard applications that use a 208 V control
P28 or P128 time delay relay. Table 2 presents the
circuit, use one leg of the 208 V circuit and a neutral
electrical ratings.
or ground wire as a 120 V source to power the time
delay relay.
Table 1: Electrical power required for
time delay relay
Timing in seconds Voltage
24 V or 120 V 240 V
30, 45, 60, 90, or 120 15 VA 30 VA
Table 2: Electrical ratings, pilot duty
Time delay relay Pilot circuit Alarm circuit* Crankcase heater** Runlight**
circuit Terminal 1 Terminal 3
120/240 VAC 750 VA, 120/240 VAC 10W Tungsten, 120/240 VAC 10 A, 120 VAC 10 W Tungsten
5 A, 240 VAC
24 VAC/VDC 125 VA, 24 VAC 125 VA, 24 VAC -- 10 W Tungsten
* Must be the same voltage as the pilot circuit.
** Must be the same voltage as the time delay relay circuit.
120/240 VAC models Low voltage models
Figure 3: P28 or P128 internal wiring circuit, with alarm circuit and runlight terminals
PC1: Pressure actuated contacts. The contacts open on an increase in pressure difference between oil and low pressure connectors. The contacts make
and break the time delay heater circuit.
PC2: The contacts close simultaneously when PC1 contacts open. Use PC2 for the runlight circuit.
TD1: Time delay relay. The contacts open after the time delay interval if the pressure difference between oil and low pressure connectors is not
established or maintained.
TD2: The contacts close simultaneously when TD1 contacts open. Use TD2 for the alarm circuit.
DR: Voltage dropping resistor used in dual voltage models.
H: Heater for time delay relay.
Connect Terminals L and M as a single-pole switch.
Connect Terminals 2 and 240 or 120 to energize the circuit only when the motor starter is closed.
4 P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
Important: For Figure 5 to Figure 7, install the jumper between 2 and M or L in the field.
240V 3-phase Ground Any Voltage
Additional controls in this line only.
120 or 240V C2
L1 L2 L3 Supply L1 L2 L3
Hot
Crankcase Operating C4
Heater Crankcase C3
Control Heater
When Used* Runlight
When Used*
if Used
240 240
T3 3
T1 T2
1 L L 240 or T1 T2 T3
1
120V
2 M M
Alarm 2*
Motor Motor
A if Used A Operating
Control
120 Additional controls
120 in this line only.
P28 or P128 P28 or P128
* You cannot cycle the crankcase heater with this wiring * When you use a crankcase heater, disconnect the
configuration. To do this, see Figure 5. jumper from 2 to M and reconnect it from 2 to L.
Figure 4: P28 or P128 on a 240 V system with 240 V Figure 6: P28 or P128 with separate supply for the
magnetic starter coil control circuit
440V
3-phase
240V 440V
Additional controls in this line only. 240V 3-phase L1 L2 L3
C2
L1 L2 L3
Crankcase Runlight
Heater if Used C3
Crankcase Operating When Used*
Heater Control
Runlight 240
When Used*
if Used 3
240 L T1 T2 T3
1
3
T1 T2 T3 2* M
1 L Alarm
Operating Motor
2* M if Used A
Alarm Control
Motor
if Used A Additional controls
120
in this line only.
P28 or P128
120
P28 or P128 * When you use a crankcase heater, disconnect the
jumper from 2 to M and reconnect it from 2 to L. Ensure
* When you use a crankcase heater, disconnect the
that the control circuit transformer has sufficient output for
jumper from 2 to M and reconnect it from 2 to L.
additional load.
Figure 5: P28 or P128 wired for 3-wire control
Figure 7: P28 or P128 wired for 440 V supply
and 240 V magnetic start coil, also applies for 550 V
with appropriate transformer
P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 5
Important: For Figure 8 and Figure 9, install the Note: For the following figure, the system provides
jumper between 2 and M or L in the field. shutdown on low lube oil pressure in either of two
240V compressors that the common motor operates.
3-phase Compressor Operating 240 V
L1 L2 L3 Control
L2
Start L1 L3
C2 Motor
Crankcase
Runlight C3
Heater Low P74AA Low P28/P128
When Used* if Used
Stop 1 240
L
240 2
T2
M T1 T3
3 Oil Oil
L T1 T2 T3
1
2* M Junction Box
Alarm
Motor
if Used A
Additional controls
in this line only. Figure 10: P28 or P128 and P74AA wired for an
120
P28 or P128
oil pressure control system with one motor operating
two compressors
* When you use a crankcase heater, disconnect the
jumper from 2 to M and reconnect it from 2 to L. Adjustments
Figure 8: P28 or P128 with manual Start-Stop The P28 and P128 controls are shipped with a cutout
pushbutton station pressure differential of 9 psi (62 kPa). However, you
can adjust the controls according to the compressor
manufacturer’s specifications.
Note: When the controls are shipped as an
accessory to the compressor unit, time delay
and cut-out pressure are set to manufacturer’s
specifications. Make sure that replacement
controls duplicate the manufacturer’s
specifications.
! CAUTION: Equipment damage hazard.
To avoid damage to the
compressor, obtain the
compressor manufacturer’s net
oil pressure specifications as
soon as possible. If necessary,
reset the cutout pressure
difference to the manufacturer’s
specifications.
Figure 9: P28 or P128 with 24 V control circuit power Setting the cutout pressure differential
from a step-down transformer
When you do not know the manufacturer’s
specifications, complete the following steps to set the
cutout pressure differential.
1. With the compressor running, read the oil pressure
and the crankcase pressure.
2. Subtract the crankcase pressure reading from the
oil pressure pump discharge reading. This is the
net oil pressure to the bearings.
6 P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
3. Use a standard screwdriver on the adjusting disk 3. Apply power to start the compressor. Expect the
to set the cut-out pointer 6 psi to 8 psi (41 kPa to time delay relay to trip after the time interval and
55 kPa) below the established running net oil stop the compressor.
pressure.
4. Remove power from the control and remove the
To increase the cut-out pressure, turn the jumper between Terminals 1 and 2.
adjusting disk counterclockwise. To decrease the
pressure, turn the disk clockwise. 5. Replace the cover on the control and apply power.
To raise the pressure differential, turn the
adjusting disk to the left when viewing the front of 6. Manually reset the time delay relay if required.
the control. See Figure 2. Turn the adjusting disk
to the right to lower the pressure differential.
C heckout procedure
T esting for shutdown Before you leave the installation, observe at least
three complete operating cycles to be sure that all
Immediately after you install the control, and at regular components function correctly.
intervals thereafter, test the time delay relay to verify
that all circuits operate correctly.
R epairs and replacement
! WARNING: Shock hazard. Disconnect the
Do not make field repairs, except for replacement of
the time delay relay assembly. For a replacement
power from the control before control or time delay relay assembly, contact the
testing for shutdown to avoid nearest Johnson Controls representative or
electrical shock or damage to Refrigeration Application Engineering at 414-525-
the equipment. 5535.
To test for shutdown, complete the following steps:
1. Remove the power from the control and remove
the control cover.
2. Connect a jumper between Terminal 1 and
Terminal 2. See Figure 3 for terminal locations.
Note: If the control is mounted on a condensing
unit where air from auxiliary equipment
such as blowers or fans can strike the
control, replace the control cover before
you proceed to Step 3.
Table 3: Replacement time delay relay assemblies
Part number Voltage Reset type Timing in seconds Alarm circuit
RLY13A-600R 120/240 VAC Manual 60 No
RLY13A-609R 24 VAC/VDC Manual 120 No
RLY13A-610R 120/240 VAC Manual 30 No
RLY13A-616R 120/240 VAC Manual 120 No
RLY13A-617R 120/240 VAC Manual 45 No
P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 7
O rdering information
Table 4: Ordering information
Series part Pressure Reset type Refrigerant Time delay relay Alarm Runlight
number connections* voltage terminal terminal
P28AA Style 13 Manual Non-corrosive 120/240 VAC No No
All-range
P128AA Style 5 Manual Non-corrosive 120/240 VAC No No
All-range
P28AN Style 15 Manual Ammonia 120/240 VAC No No
P28DN Style 15 Manual Ammonia 120/240 VAC Yes Yes
P28PA Style 5 Manual Non-corrosive 24 VAC/VDC No No
All-range
* Style 5 connections are 1/4 in. / 6.4 mm SAE male flare connectors (no capillary tubing). Style 13 connections are 36 in. / 914 mm capillary tubing and
1/4 in. / 6.4 mm flare nut. Style 15 connections are 1/4 in. / 6.4 mm female National Pipe Thread connectors.
S pecifications
Specification Description
Product P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay
Power requirements See Table 1 and Table 2.
Pressure specifications Adjustable cutout pressure difference: 8 to 70 psi (55 to 483 kPa)*
Maximum differential: 70 psi (483 kPa)
Maximum working pressure: 250 psig (1724 kPa) on the high side
Maximum overpressure: 325 psi (2240 kPa) oil and low side pressure
*The time delay relay de-energizes 3 psi to 5 psi (21 kPa to 34 kPa) above the cutout scale
setting.
Pressure switch units Enclosed dust-protected Pennswitch
Ambient operating conditions 32 to 104°F / 0 to 40°C
Material Case: 0.062 in. / 1.6 mm galvanized steel
Cover: 0.028 in. / 0.7 mm cold rolled steel (plated and painted)
Wiring terminal Large 8-32 x 1/4 in. binder head screws
Agency listings UL Guide No. SDFY, File SA516
cUL Guide No. SDFY7, File SA516
Dimensions (H x W x D) 5.66 in. x 5.32 in. x 2.09 in. / 144 mm x 135 mm x 53 mm
Shipping weight 3.0 lb / 1.36 kg
Conformity declaration information
Specification Description
Purpose of control Pressure operating controls
Method of mounting control Flat surface or with a universal mounting bracket (Part No. 271-51)
Method of earthing of control Wiring binding screw terminal
Type 1 or Type 2 action Type 1.C (micro-interruption)
External pollution situation Pollution degree 3
Rated impulse voltage 4,000 VAC
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications,
consult the local Johnson Controls Refrigeration Application Engineering at 414-525-5535. Johnson Controls shall not be liable for damages resulting
from misapplication or misuse of its products.
8 P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
Single point of contact
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