| Вид документа | Інструкція з монтажу |
|---|---|
| Виробник | JCI |
| Код документа | p29-series-low-pressure-control-with-time-delay-relay-installation-guide |
| Група обладнання | P29 Low Pressure Cutout Control with Time Delay |
| Сторінок | 4 |
| Мова документа | англійська |
| Розмір файлу | 0.5 МБ |
Текст документа
Installation Guide P29
Issue Date 0622
P29 Series Low Pressure Control
with Time Delay Relay
Application
IMPORTANT: Use this P29
The P29 Series control Series low pressure control
combines a pressure sensing with time delay relay only as
mechanism with a time delay. A an operating control. Where
drop in pressure energizes the failure or malfunction of the
time delay relay and opens a P29 control could lead to
contact after a predetermined personal injury or property
period. damage to the controlled
equipment or other property,
There are two main applications
additional precautions must
for this control:
be designed into the control
• Chiller: low temperature system. Incorporate and
You connect the pressure maintain other devices,
element to the suction side such as supervisory or
of a chiller refrigeration alarm systems or safety or
system and wire the time limit controls, intended to Fig. 1 Interior view of a P29
delay relay to the warn of or protect against control
compressor control circuit. failure or malfunction of the
Prolonged low suction P29 control. Installation
pressure, such as pressure
caused by a low temperature Mounting
condition, causes the control
Operation
Use the two mounting screw holes
to shut down the refrigeration When the equipment starts, the located on the back of the control
compressor. time delay heater energizes. If case to mount the control, in any
the pressure does not reach the position, directly to a wall or panel
• Industrial equipment:
heater-off value within the board. Mount the control so that
lubrication oil pressure On
required time limit, the time the pressure connection on the
any electrically driven
delay relay trips to stop the bellows is above the liquid level of
machine with a forced oil
equipment. the equipment on which you are
system, you connect the
pressure element to the lube If the pressure rises to the using the control.
oil system and wire the time heater-off value within the Do not mount the control in a
delay relay in the control required time limit, the time location where vibration might
circuit. The time delay delay relay does not trip and the cause malfunction or damage,
provides a period of time for equipment continues to run. even though tests indicate that the
oil pressure to build up on P29 control has some ability to
startup or to recover from
Time delay relay perform at vibrations of 2.5 G at
temporary fluctuations. A 10 to 55 cycles per second.
sustained loss of oil pressure The time delay relay is a thermal
causes the control to shut expansion device with a trip-free If required, universal mounting
down the machine. manual reset. The time delay bracket Part No. 271-51 is
relay compensates to minimize available.
the effect of ambient Note: Use only mounting screws
! CAUTION: Risk of temperature variations. Voltage supplied with the control to avoid
equipment damage. On variations affect the timing. damage to internal components.
ammonia installations the
ammonia pressure control
should be mounted sepa-
rately from the electrical
cabinet. Do not use on an
ammonia system unless the
control is marked for
ammonia service.
© 2022 Johnson Controls 1
Part No. 997-659, Rev. H
Use P29 controls at normal room
temperatures of 32°F to 104°F
(0°C to 40°C) and in areas
protected from the weather. Use
the control where normal working
pressures do not exceed 250
PSIG (1723 kPa) and never
expose it to a test overpressure
greater than 325 PSIG (2240
kPa).
Pressure connections
• Avoid sharp bends or kinks
in the capillary tubing.
• Purge all tubing and lines
before you connect the Fig. 2 Internal wiring for 120/240 VAC models
pressure controls.
• Coil and secure excess
capillary to avoid vibration.
Allow some slack in the
capillary to avoid violin string
vibration which can cause
tubing to break. Do not allow
the tubing to rub against
metal surfaces where friction
can damage the capillary.
IMPORTANT: With a 1/4 in.
male SAE flare fitting and
1/4 in. tubing, you must use
a pulsation dampener
where there is a possibility
of pulsation.
Fig. 3 Standard wiring for the P29 on a 240 V system with a 240 V magnetic
starter coil
Wiring Make all wiring connections with When you install a P29 control
copper conductors only, and in on a 440 VAC or 550 VAC
accordance with local, national, system, use an external step-
! WARNING: Risk of and regional regulations. down transformer to provide
electrical shock. either 120 V or 240 V to the pilot
For the maximum electrical
Disconnect the power and time delay relay circuits.
rating of the control, refer to the
supply before mounting and label inside the control cover. Table 1: Power required for
wiring to prevent possible time delay relay
electrical shock. On multiple Note: Use the terminal screws
circuit units, more than one supplied with the Pennswitch (8- Timing (s) Voltage
circuit may have to be 32 x 1/4 in. binder head). Do not 24, 120 240
disconnected. substitute screws of a different
30, 60, 90, 15 VA 30 VA
size.
or 120
For applications that use a 208 V Note: 240 V includes dropping
! CAUTION: Risk of control circuit, for standard resistor wattage.
equipment damage. applications use one leg of the
The transformer must be of
Disconnect the power 208 V control circuit and a
sufficient volt-ampere capacity to
supply before mounting and neutral wire to power the 120 V
operate the motor starter and the
wiring to avoid damage to circuit of the time delay heater.
P29 time delay relay. For wiring,
equipment. On multiple see Fig. 3 to Fig. 6 or the wiring
circuit units, more than one diagrams with the
circuit may have to be manufacturer’s specifications.
disconnected.
2 P29 Installation Guide
Adjustments
To adjust the setpoint, turn the
setpoint adjustment screw
clockwise to raise the pressure
setting or counterclockwise to
lower setting. The screw is at the
top of the control case.
Adjust the control so the setpoint
is at, or just above, the specified
minimum pressure. The time
delay is factory set and sealed
and cannot be field-adjusted.
Test for shutdown
Fig. 4 Internal wiring diagram for low voltage models
! WARNING: Risk of
electrical shock.
Disconnect the power
supply before testing to
prevent possible electrical
shock. On multiple circuit
units, more than one circuit
may have to be
disconnected.
Immediately after installation and
at regular intervals thereafter,
you must test the time delay
relay to be sure that all circuits
operate correctly. Proceed as
follows:
1. Pull the disconnect switches
and remove the cover from
the P29 control. Fig. 5 Wiring with 24 V control circuit power from a step-down transformer
2. Connect a jumper between
terminal 1 and 2.
3. Close the line switch to start the
compressor running. The time
delay relay stops the compressor
after the time delay interval.
Note: Replace the cover before
testing if the control is mounted
on a condensing unit and where
air from auxiliary equipment,
such as blowers or fans, may
affect the time delay heater.
4. After testing the time delay
relay, pull the disconnect line
switches again and remove
the jumper between terminals
1 and 2.
5. Place the cover on the
control, close the line switch,
and manually reset the time
delay relay.
P29 Installation Guide 3
Checkout procedure Repairs and replacement
Before you leave the installation, Do not make field repairs except
observe at least three complete for replacement of the time delay
operating cycles to ensure all relay assembly. You can replace
components function correctly. or interchange the timer and
terminal board in the field. For
replacements, contact a
Johnson Controls® distributor.
Table 2: Replacement time delay relay assemblies
Part number Voltage Type of Timing Alarm circuit
reset
RLY13A-600R 120/240 VAC Manual 60 s No
RLY13A-609R 24 VAC/VDC Manual 120 s No
RLY13A-610R 120/240 VAC Manual 30 s No
RLY13A-613R 12 VAC Manual 120 s No
RLY13A-616R 120/240 VAC Manual 120 s No
Table 3: Conformity declaration information
Information 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
Single point of contact
APAC: Europe: NA/SA: UK:
JOHNSON CONTROLS JOHNSON CONTROLS JOHNSON CONTROLS JOHNSON CONTROLS
C/O CONTROLS PRODUCT MANAGEMENT VOLTAWEG 20 5757 N GREEN BAY AVE. TYCO PARK
6101 XK ECHT GLENDALE, WI 53209
NO. 32 CHANGJIANG RD NEW DISTRICT GRIMSHAW LANE
THE NETHERLANDS USA
WUXI JIANGSU PROVINCE 214028 MANCHESTER M40 2WL
CHINA UNITED KINGDOM
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of their respective owners. © Copyright 2022 by Johnson Controls. All rights reserved.
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