Johnson Controls RLY13A-600R, RLY13A-602R, RLY13A-603R, RLY13A-608R, RLY13A-609R Series Manual

...
P28 and P128 Series Lube Oil Controls
with Built-in Time Delay Relay
Manual or automatic reset models are available with factory set and sealed time delays of 30, 45, 60, 90, or 120 seconds (all time delays may not be available on all models). The P128 is the same control as the P28 but with 1/4 inch male flare pressure connections.
Master Catalog 125
Pressure Controls Section P
Product/Technical Bulletin P28
Issue Date 0498
Figure 1: P128AA
Features and Benefits
Built-in Time Delay Relay with Ambient Compensation
Trip-free Manual Reset Provides manual reset that cannot be overridden
Replaceable Time Delay Relay Assembly
Available with Runlight and Alarm Terminals
Minimizes timing fluctuations due to temperature variations
by pressing and holding the reset button
Allows easy field replacement of the time delay relay and terminal board
Allows the control to be wired for normal oil pressure runlight signals and shutdown alarm circuits for remote monitoring of oil pressure status
© 1998 Johnson Controls, Inc.
Part No. 24-7664-605, Rev. A Code No. LIT-125420
1
ntroduction
I
!
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 any way, user must provide for proper containment.
The P28 and P128 controls measure the net oil pressure available to circulate oil throughout a pressure-lubricated refrigeration system. The net oil pressure is the difference between the oil pressure at the pump discharge and the refrigerant pressure in the compressor crankcase.
Example: If the oil pressure pump discharge reading
is 90 psi (621 kPa) and the crankcase pressure is 70 psi (483 kPa), the net oil pressure is 20 psi (138 kPa).
The P28 and P128 have a built-in time delay relay. This relay allows the oil pressure to build up for the time delay period before the compressor trips. This also prevents nuisance lockouts due to intermittent loss of oil pressure. The time delay relay is a “trip free” device. The manual reset cannot be overridden by pressing and holding the reset button.
Manual reset models are available with time delays of 30, 45, 60, 90, or 120 seconds. Automatic reset models are available with a 90-second time delay. The time delay relay is compensated to minimize the effect of ambient temperature variations. However, the time delay relay will be affected by voltage variations.
Dimensions
Figure 2: P28 or P128 Dimensions (in./mm)
peration
O
When the compressor starts, the timer is energized because the net oil pressure of the system is zero. During normal operation, the net oil pressure should build up to the pressure switch’s cut-out setting (scale setting) plus the switch differential (3 to 5 psi [21 to 34 kPa]) within the required time delay, causing the time delay relay to de-energize.
If the net oil pressure does not rise to the cut-out pressure setting plus the switch differential within the required time delay, the time delay relay trips and stops the compressor.
If the net oil pressure drops below the cut-out pressure setting during the compressor’s run cycle, the time delay relay energizes. If the net oil pressure returns within the time delay, the time delay relay de-energizes and the compressor continues to operate normally. If the net oil pressure does not return within the time delay, the control shuts down and locks out the compressor.
2 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
Example: Net oil pressure (oil pump pressure minus
crankcase pressure) required to the bearings is 9 psi (62 kPa). The control scale setting should be 9 psi (62 kPa). The switch differential is 5 psi (34 kPa). Upon initial start of the compressor, the time delay relay energizes. If the net oil pressure does not build up to 14 psi (97 kPa), or the scale setting (9 psi) plus the switch differential (5 psi), during the time delay, the control breaks the circuit to the compressor. If the pressure of 14 psi (97 kPa) is reached during the time delay, the time delay relay de-energizes and the compressor continues to operate normally.
nstallation
I
Mounting
Pressure Connections
!
CAUTION: Equipment damage hazard.
Avoid sharp bends or kinks in the capillary or tubing to avoid damage to the capillary.
Coil and secure excess capillary or tubing. Because harmonic vibration can break the capillary or tubing, some slack must be provided.
Do not allow the capillary or tubing to rub against metal surfaces where friction can cause damage.
When using a control with 1/4 in. / 6.4 mm tubing, a pulsation damper must be used. Pulsation can cause excessive wear and damage the control.
!
CAUTION: Equipment damage hazard.
A P28AN or P28DN control used for ammonia service must be mounted separately from the electrical cabinet. An ammonia leak could damage the electrical circuitry.
Do not use Johnson Controls/Penn Ecosafe® hose tubing in applications with ammonia or other corrosive refrigerants. Corrosion could cause tube breakage and refrigerant leakage.
Use only the mounting screws supplied with the control. Damage to internal components may occur if other screws are used.
The P28 and P128 controls are not position sensitive and can be mounted in any position.
Use the two mounting screw holes located on the back of the control case to mount the control directly to a wall or panel board. Mount the control so that the pressure connections on the bellows are above the crankcase liquid level of the equipment being controlled.
Note: When mounting the control to a
compressor is required, a mounting bracket (Part No. 271-51) is available.
1. Purge all tubing and lines before connecting the pressure control.
2. Connect the oil pressure line pump discharge to the pressure connector labeled “OIL.”
3. Connect the crankcase pressure line to the pressure connector labeled “LOW.”
4. Coil and secure excess capillary or tubing to avoid vibration.
Wiring
!
WARNING: Shock hazard. Disconnect
all power supplies before making wiring connections to avoid electrical shock or damage to the equipment.
Make all wiring connections using copper conductors only.
Wire in accordance with National Electric Code and local regulations. For 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 Figures 3 through 10 for typical wiring diagrams or refer to the compressor manufacturer’s specifications.
P—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 Terminal 3, it may be wired to operate a runlight for indicating when there is sufficient net oil pressure. When the control is supplied with a Terminal A, it can be wired to operate a shutdown alarm or signal for indicating when the compressor has tripped.
For applications using a 208V control circuit, it is suggested that one leg of the 208V circuit and a neutral or ground wire be used as a 120V source to power the time delay relay.
When a P28 or P128 is installed on a 440 or 550 VAC system, use an external step-down transformer to provide either 120 or 240V to the pilot and time delay relay circuits. The transformer must be of sufficient volt ampere capacity to operate the motor starter and the time delay relay. Table 1 presents the power requirements for the P28 or P128 time delay relay. Table 2 presents the electrical ratings.
Table 1: Electrical Power Required for Time Delay Relay
Voltage
Timing in
Seconds
30, 45, 60, 90, or 120
Table 2: Electrical Ratings--Pilot Duty
Time Delay Relay
Circuit
120/240 VAC 750 VA, 120/240 VAC 10W Tungsten, 120/240 VAC 10 Ampere, 120 VAC
24 VAC/VDC 12 VAC/VDC
* Must be the same voltage as the pilot circuit.
** Must be the same voltage as the time delay relay circuit.
Low
Pilot Circuit Alarm Circuit* Crankcase Heater**
(Terminal 1)
5 Ampere, 240 VAC
125 VA, 24 VAC
57.5 VA, 24 VDC
PC
2
Oil
120/240 Models
240
3 1
PC
TD
1
2
2
H
120
DR
L TD M A
125 VA, 24 VAC
57.5 VA, 24 VDC
1
Low
Oil
Low Voltage Models
3 1
PC
PC
2
1
2
H
*12 volt also available.
TD
2
24*
L TD M A
12, 24, or 120V 240V
15 VA 30 VA
Runlight**
(Terminal 3)
10W Tungsten
-- 10W Tungsten
1
-
Pressure actuated contacts. Open on increase in pressure difference between oil and low pressure conntectors. Makes
PC
1
and breaks t ime delay heater circuit.
-
Contacts close simultaneously when PC contacts open (runlight circuit).
PC
2
-
Time delay relay. Contacts open after time delay interval if pressure dfference between oil and low pressure connectors
TD
1
is not established or maintained.
-
Contacts close simultaneously when TD contacts open (alarm circuit).
TD
2
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 circuit only when motor starter is closed.
1
1
Figure 3: P28 or P128 Internal Wiring Circuit, Showing Alarm Circuit and Runlight Terminals
4 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
Crankcase
Heater
When Used*
Additional controls in this line only.
Operating
Control
240
1
L
2
M
A
120
P28 or P128
240V 3-phase
L
L2L
1
T1T
2T3
Motor
C
C
3
Any Voltage
2
L1L2L
C
4
3
Ground
3
120 or 240V
Supply
Hot
Crankcase
Heater
When Used*
Runlight if Used
240
3
Alarm if Used
L
1
2
*
A
M
240 or
120V
Operating
T
1T2T3
Motor
Control
Additional controls
120
in this line only.
P28 or P128
*Crankcase heater cannot be cycled with this hookup. See Figure 5.
Figure 4: P28 or P128 Used on a 240V System with
240V Magnetic Starter Coil
Additional controls in this line only.
Crankcase
Heater
When Used*
Runlight if Used
Operating
Control
240
3
L
1
2
*
Alarm if Used
M
A
120
P28 or P128
*When crankcase heater is used, disconnect jumper from 2 to M and reconnect from 2 to L.
240V 3-phase
L1L2L
T
1T2T3
Motor
Figure 5: P28 or P128 Wired for 3-wire Control
(Jumper between 2 and M [or L] must be field
installed.)
*When crankcase heater i s used, disconnect jumper f rom 2 to M and reconnect from 2 to L.
Figure 6: P28 or P128 Where Separate Supply is
Provided for Control Circuit (Jumper between
2 and M [or L] must be field installed.)
440V
3-phase
3
Crankcase
Heater
When Used*
240V 440V
Runlight if Used
L1L2L
C
2
C
3
3
240
3
T
1T2T3
Motor
Additional controls in this line only.
Alarm
if Used
L
1
M
2
*
A
120
P28 or P128
Operating
Control
*When crankcase heater is used, disconnect jumper 2 to M and reconnect 2 to L. Also, make sure that control circuit transformer has sufficient output for additional load.
Figure 7: P28 or P128 Wired for 440V Supply
and 240V Magnetic Start Coil (Also for 550V
Using Proper Transformer) (Jumper between
2 and M [or L] must be field installed.)
P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 5
240V
3-phase
Start
Crankcase
Heater
When Used*
Alarm if Used
*When crankcase heater i s used, disconnect jumper from 2 to M and reconnect 2 to L.
Runlight if Used
240
3
L
1
2
*
M
A
120
P28 or P128
C
C
Stop
Additional controls in this line only.
L1L2L
2
3
T1T2T
Motor
Compressor
3
Low
Oil
3
Note:This system would provide shutdown on low
Motor
P74AA
lube oil pressure in either of two compressors operated by the common motor.
Low
P28/P128
Oil
Junction Box
1
2
240
L
M
Operating
Control
240 V
L
1
T
1
L
2
L
3
T
2
T
3
Figure 10: P28 or P128 and P74AA Wired for an
Oil Pressure Control System Where One Motor
Operates Two Compressors
Figure 8: P28 or P128 Where Manual “Start-Stop”
Pushbutton Station is Used (Jumper between
2 and M [or L] must be field installed.)
240V
3-phase
L
1L2L3
T1T2T
Motor
3
Alarm
if Used
3
L
1
2
M
A
24*
P28 or P128
Transformer
Starter Coil
Operating
Control
Additional controls in this line only.
*12 volt also available.
Figure 9: P28 or P128 Where 24V Control Circuit
Power is from a Step-down Transformer (Jumper
between 2 and M must be field installed.)
Adjustments
The P28 and P128 controls are shipped with a cut-out pressure differential of 9 psi (62 kPa). However, the controls can be adjusted 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. Replacement controls should duplicate the manufacturer’s specifications.
!
CAUTION: Equipment damage hazard.
To avoid damage to the compressor, obtain the compressor manufacturer’s net oil bearing pressure specifications as soon as possible. If necessary, reset the cut-out pressure difference to the manufacturer’s specifications.
When the manufacturer’s specifications are not known, proceed as follows to set the cut-out 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.
3. Set the cut-out pointer 6 to 8 psi (41 to 55 kPa) below the established running net oil pressure with the Adjusting Disk using a standard screwdriver.
6 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
To increase the cut-out pressure, turn the Adjusting Disk counterclockwise. To decrease, turn clockwise.
3. Apply power to start the compressor. The time delay relay should trip after the time interval and stop the compressor.
To raise the pressure differential, turn the Adjusting Disk (see Figure 2) to the left when viewing the front of the control. Turn the adjusting disk to the right to lower the pressure differential.
est for Shutdown
T
Immediately after installing, and at regular intervals thereafter, the time delay relay should be tested to verify that all circuits are operating correctly.
!
WARNING: Shock hazard. Disconnect
power from the control before testing for shutdown to avoid electrical shock or damage to the equipment.
To test for shutdown:
1. Remove power from the control and remove the control cover.
2. Connect a jumper between Terminals 1 and 2. See Figure 3 for terminal locations.
Note: If the control is mounted on a condensing
unit where air from auxiliary equipment (blowers or fans) may strike the control, the control cover should be replaced before proceeding to Step 3.
4. Remove power from the control and remove the jumper between Terminals 1 and 2.
5. Replace the cover on the control and apply power.
6. Manually reset the time delay relay if required.
heckout Procedure
C
Before leaving the installation, observe at least three complete operating cycles to be sure that all components are functioning correctly.
ungus Proofing
F
Fungus proofing can be supplied at extra cost when specified. Conforms to government specifications MIL-V-173A.
epairs and Replacement
R
Field repairs must not be made, except for replacement of the time delay relay assembly. For a replacement control or time delay relay assembly, contact the nearest Johnson Controls representative or Refrigeration Application Engineering at 414-274-
5535.
Table 3: Replacement Time Delay Relay Assemblies
Part Number Voltage Reset Type Timing in Seconds Alarm Circuit
RLY13A-600R
RLY13A-602R
RLY13A-603R
RLY13A-608R
RLY13A-609R
RLY13A-610R
RLY13A-616R
RLY13A-617R
P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 7
120/240 VAC Manual 60 No
120/240 VAC Manual 90 No
120/240 VAC Manual 90 Yes
120/240 VAC Automatic 90 No
24 VAC/VDC Manual 120 No
120/240 VAC Manual 30 No
120/240 VAC Manual 120 No
120/240 VAC Manual 45 No
rdering Information
O
Table 4: Ordering Information
Series Part
Number
P28AA Style 13, Style 5,
P128AA Style 5 Manual Non-corrosive
P28AN Style 15 Manual Ammonia 120/240 VAC No No
P28DA Style 13 Manual Non-corrosive
P28DN Style 15 Manual Ammonia 120/240 VAC Yes Yes
P28GA Style 13 Automatic Non-corrosive
P28NA Style 13 or Style 5 Manual Non-corrosive
P28PA Style 5 Manual Non-corrosive
* 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.
pecifications
S
Power Requirements See Tables 1 and 2.
Pressure Specifications Adjustable Cut-out Pressure Difference: 8 to 70 psi (55 to 483 kPa)*
Pressure Switch Units Enclosed Dust-protected Pennswitch
Ambient Operating Conditions 32 to 104°F / 0 to 40°C
Dimensions (H x W x D) 5.66 x 5.32 x 2.09 in. / 144 x 135 x 53 mm
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) 274-5535. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.
Pressure
Connections*
or Style 15
Product P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay
Material Case: 0.062 in. / 1.6 mm Galvanized Steel
Mounting Flat Surface or with a Universal Mounting Bracket (Part No. 271-51)
Wiring Terminal Large 8-32 x 1/4 in. Binder Head Screws
Agency Listings UL Guide No. SDFY; File SA516**
Shipping Weight 3.0 lb / 1.36 kg
Reset Type Refrigerant Time Delay
Relay Voltage
Manual Non-corrosive
All-range
All-range
All-range
All-range
All-range
All-range
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 is de-energized 3 to 5 psi (21 to 34 kPa) above the cut-out scale setting.
Cover: 0.028 in. / 0.7 mm Cold Rolled Steel (plated and painted)
CSA Class No. 1222 01; File LR948** **Most models. Contact Johnson Controls for a complete listing.
120/240 VAC No No
120/240 VAC No No
120/240 VAC Yes Yes
120/240 VAC No No
24 VAC/VDC No No
24 VAC/VDC No No
Alarm
Terminal
Runlight Terminal
Controls Group FAN 125
507 E. Michigan Street Master Catalog P.O. Box 423 Milwaukee, WI 53201
8 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin
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