| Вид документа | Бюлетень виробу |
|---|---|
| Виробник | JCI |
| Код документа | series-p28-oil-pressure-cutout-differential-pressure-control-with-built-in-time |
| Група обладнання | P28 and P128 Lube Oil Pressure Control |
| Сторінок | 5 |
| Мова документа | англійська |
| Розмір файлу | 0.3 МБ |
Текст документа
FAN 216
Section A
Product Bulletin
Issue Date 0622
P28 and P128 Series Oil Pressure Cutout
Differential Pressure Control with Built-in
Time Delay Relay
Application Use the P28 control at normal Timing is affected by voltage
room temperatures of 32ºF to variations.
104ºF (0ºC to 40ºC) and in areas
protected from the weather. Installation
Use P28 and P128 controls only Mounting
as an operating control. Where 1. Position the control so that the
failure or malfunction of the pressure connections on the
controls could lead to personal bellows are above the
injury or property damage to the crankcase liquid level of the
controlled equipment or other equipment on which you use
property, additional precautions the control.
must be designed into the control
system. Incorporate and maintain 2. Use the two mounting screw
other devices, such as holes located on the back of
supervisory or alarm systems or the control case to mount the
safety or limit controls, intended control in any position, directly
to warn of or protect against to a wall or panel board.
failure or malfunction of the
If required, universal mounting
control.
bracket Part No. 271-51 is available.
Operation
When the compressor starts, the
The P28 and P128 Series time delay heater energizes. If
controls provide dependable the net oil pressure does not
and economical oil pressure build up to the heater off value in
cutout for pressure lubricated the required time limit, the time
refrigeration compressors. The delay trips to stops the
factory set pressure adjustment compressor.
provides operation to the
compressor manufacturer’s If the net oil pressure rises to the
specifications. heater off value in the required time
after the compressor starts, the time
The P28 and P128 measure the delay heater automatically de-
net oil pressure available to energizes and the compressor
circulate oil through the continues to operate normally. Note: Use only mounting screws
lubrication system. Net oil supplied with control to avoid
pressure is the difference If the net oil pressure drops below
damage to internal components.
between the oil gage pressure the heater on value, also known as
and the refrigerant pressure in the scale setting, during the running CAUTION: If you apply the P28
the crankcase. cycle, the time delay relay energizes. control for ammonia service, you
If the net oil pressure does not return must mount the control separately
A built-in time delay relay, to the heater off value in the time from the electrical cabinet.
accurately compensated for delay period, the compressor shuts
ambient temperature, provides down. Pressure connections
time for pressure to rise on • Avoid sharp bends or kinks in
startup and avoids nuisance Time delay relay the capillary tubing.
shutdowns on short duration
The time delay relay is a trip-free,
pressure losses during the • Purge all tubing and lines
thermal expansion device. Manual
running cycle. When supplied before you connect the
reset models are available with
with Terminal 3, you can wire the pressure controls. Connect the
factory set and sealed time delays of
control to operate a runlight to oil pressure line to the
30, 45, 60, 90, or 120 seconds.
indicate when sufficient net oil pressure connector labeled
pressure is present. Purchase a The time delay relay is OIL and the crankcase line to
model with Terminal A if you compensated to minimize the effect the pressure connector labeled
need a shutdown alarm or signal. of ambient temperature variations. LOW.
© 2022 Johnson Controls 1
LIT-121400, Rev. C
• Coil and secure the excess Table 1: Electrical power setting to 9 psi (62 kPa). Upon an
capillary to avoid vibration. required for time delay relay initial start of the compressor, or if
Allow some slack in capillary to the oil pressure drops during the
avoid violin string vibration Timing (s) Voltage running cycle, the time delay
which can cause the tubing to 24 V or 240 V heater energizes. If during the time
break. Do not allow the tubing 120 V period the lube oil pressure does
to rub against metal surfaces not build up to the scale setting
where friction can damage the 30, 45, 60, 15 VA 30 VA plus 5 psi (34 kPa) for the switch
capillary. 90, or 120 differential, which is a total of 14
psi (97 kPa), the control breaks the
CAUTION: With a 1/4 in. male SAE Note: 240 V includes dropping
circuit to the compressor. If it
flare fitting and 1/4 in. tubing, a resistor wattage.
reaches the pressure of 14 psi (97
pulsation dampener must be used kPa) during the timing period, the
where there is a possibility of time delay heater de-energizes and
pulsation. Adjustment the compressor can continue
Wiring You can change the factory setting in normal operation.
the field. The standard stock setting Pressure specifications
WARNING: Disconnect the power is:
supply before the wiring connections
• The time delay shutdown
are made to avoid possible electrical Cutout 9 psi (62 kPa) pressure
range, in pressure difference,
shock or damage to the equipment. difference.
is 8 psi to 70 psi (55 kPa to
On multiple circuit units, more than Heater off pressure is
480 kPa)
one circuit may have to be approximately 5 psi (34 kPa)
disconnected. higher than the cutout. • The maximum allowable
overrun pressure is 325 psig
Make all wiring connections with Note: When the controls are shipped
(2,240 kPa)
copper conductors only, and in as an accessory to the compressor
accordance with the National unit, time delay and pressure are set Note: The time delay heater de-
Electrical Code and local regulations. to manufacturer’s specifications. energizes at 5 psi (34 kPa) pressure
For the maximum electrical rating of Ensure that replacement controls difference above the scale setting.
the control, see the label inside the duplicate the manufacture’s
control cover. specifications for time delay and Test for shutdown
pressure settings. Immediately after you install the
Note: Use the terminal screws
supplied in the Pennswitch (8-32 x When manufacturer’s settings are control, and at regular intervals
1/4 in. binder head). Substitution of not known, call the nearest thereafter, test the time delay relay to
other screws may cause problems distributor or proceed as follows: be sure that all circuits operate
in making correct connections. correctly. Proceed as follows:
1. With the compressor running, read
See the label inside the control the oil pressure and crankcase 1. Pull the disconnect switch and
cover or in the manufacturer’s pressure. remove the cover from the P28
specifications for a typical wiring control.
2. Subtract the crankcase pressure
diagram. 2. Connect a jumper between
from the oil pressure gage
For external wiring diagrams, see reading. This is the net oil terminals 1 and 2.
Fig. 4 to Fig. 11. pressure to the bearings. 3. Close the line switch to start the
For standard applications that use 3. Set the cutout pointer 6 psi to 8 compressor.
a 208 V control circuit, use one leg psi (41 kPa to 55 kPa) below the The time delay relay stops the
of the 208 V circuit and a neutral or established running net oil compressor after the time delay
ground wire as a 120 V source to pressure. interval.
power the time delay heater.
CAUTION: Obtain the compressor Note: If the control is mounted on
When you install a P28 control on a manufacturer’s net oil pressure a condensing unit where air from
440 VAC or 550 VAC system, use an specifications as soon as possible, auxiliary equipment, such as
external step-down transformer to and reset the cutout pointer if it is not blowers or fans, can strike the
provide either 120 V or 240 V to the in accordance with the control, replace the cover before
pilot and time delay relay circuits. manufacturer’s specifications. the test. After testing the time
The transformer must be of sufficient delay relay, again pull the
To raise the cutout setting, turn
volt-ampere capacity to operate the disconnect switch and remove
adjusting disk C to the left as
motor starter and the P28’s time the jumper between terminals 1
viewed from the front of the control.
delay relay. and 2. Place the cover on the
Turn the disk to the right to lower
the cutout setting. control and close the disconnect
switch. Manually reset the time
Example: Suppose the minimum delay relay.
lube oil pressure required to the
bearings is 9 psi (62 kPa) (oil pump
pressure minus crankcase
pressure). You set the control scale
2 P28 and P128 Series Oil Pressure Cutout Differential Pressure Control With Built-In Time Delay Relay Product Bulletin
Checkout procedure
Before you leave the installation, observe at least three complete operating cycles to be sure that all components
function correctly.
Repairs and replacement
In the field, you can replace or interchange the time delay relay assembly, which consists of the timer and terminal board.
Do not make field repairs except for replacement of the time delay relay assembly. For a replacement control or time delay
relay assembly, contact the nearest Johnson Controls® wholesaler.
Table 2: 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
Wiring diagram definitions
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 factory-
set 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. Connect Terminals L and M as a single-pole switch. Connect
Terminals 2 to the 240 V or 120 V terminal to energize the circuit
H: Heater for time delay relay. only when the motor starter is closed. See standard wiring
diagrams for details.
A, 3: In Figure 4, Figure 6 to Figure 9, and Figure 11, the
shutdown alarm circuit is A and the runlight is Terminal 3. Fig 4 — Internal circuit for a 120 VAC/240 VAC P28 control
Wiring diagrams
Note: Observe the instructions for the jumper for each
diagram.
You cannot cycle a crankcase heater with this configuration. For
an alternative, see Fig 6.
Fig 5 — Standard wiring for a P28 on a 240 V system with 240
V magnetic coil starter
P28 and P128 Series Oil Pressure Cutout Differential Pressure Control With Built-In Time Delay Relay Product Bulletin 3
In the field, you must install a jumper between 2 and either M or
L.
Fig 6 —P28 with 3-wire control, not 4-wire
In the field, you must install a jumper between 2 and either M or
L. Additional controls could be high pressure cutout, low pressure,
or temperature controls.
Fig 9 —Standard wiring for P28 with manual start-stop push
button
In the field, you must install a jumper between 2 and either M or
L. The magnetic coil in the starter must be the same voltage as
the control circuit supply. Only install the operating control and
addition controls between M and C4.
Fig 7 —P28 with separate supply to the control circuit
Connect Terminal L so that the circuit only energizes when
the operating control and overload terminals are closed.
Fig 10 —Low voltage P28 internal wiring
In the field, you must install a jumper between 2 and either M or
L. Use the correct transformer if you use a 550 V supply. Only use
a crankcase heater if the control transformer has sufficient output
for the additional load. Only install the operating control and
addition controls between M and C4.
Fig 8 —P28 for 440 V or 550 V supply and 240 V magnetic
starter coil
Fig 11 —P28 with 24 V control circuit power from a step-
down transformer
4 P28 and P128 Series Oil Pressure Cutout Differential Pressure Control With Built-In Time Delay Relay Product Bulletin
FAN 216
Section A
Product Bulletin
Issue Date 0622
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
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© 2022 Johnson Controls 5
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