Brochure

Catalog CIC-2003-1/US
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
357
Industrial Refrigeration Products: Pressure Regulators
Industrial
Refrigeration
Products
A4 Adaptomode
®
Series
Ordering Information Required
Catalog Pressure Voltage, Pilot Set Temp. Bulletin
Added Variation Code Pages* Range(s) Coil Light Motor Point Range Number
Electric Shut-Off S 356-357 ●★★ 23-06
Electric Wide Opening B 356-357 ●★★ 23-06
Dual Pressure Regulator D 356-357 ●● ★ ★ 23-06
Reseating Relief Regulator K
1
356-357 ●●23-05
Outlet Pressure Regulator O 358-359 ● 23-07
Differential Pressure Regulator L
2
360-361 ● 23-10
Electrically Compensated M
3
364-365 ●●23-11
1:1 Pneumatically Compensated P 360-361 ● 23-08
3:1 Pneumatically Compensated 3P 360-361 ● 23-08
Temperature Operated T 362-363 ● 23-09
Electronic Pilot Operated J
4
366-367 ● 23-12
Externally Equalized E 356-357 ● 23-05
Main Regulator for Remote Pilot R 356-357 23-05
Complete Regulator Assembly
Z
5
12-13 ● 23-06
w/ Modudapter® & 2 Moduplates®
Regulator Variations
NOTES:
1 Factory set and tagged. Standard 4.9 bar (70 PSIG)
2 Determine range from pressure difference required
3 Thermostats available to order separately
4 Includes a Landis & Staefa M2FP03GX direct operated proportional solenoid as pilot valve.
Order I/O module and controller within model number. Transformer may be ordered separately.
5 See pages 372-374 for Adaptomode modules sold separately.
* Page numbers reference information for flanged body regulators, 20-100mm (¾" to 4").
For weld end bodies, 125-200mm (5" - 8"), see pages 370-371.
Low Pressure Drop Option (LPD)
With the conventional evaporator regulator, a minimum
of 2 PSI pressure across the main valve is required for
the valve to be fully open. The Low Pressure Drop
feature added to a Type A4 inlet or outlet pressure
regulator permits full flow modulation with prsesure
drops down to 1/2 PSI.
The principle of operation for the LPD is to provide
high pressure refrigerant to the A2BOP pilot inlet line.
Reduce this high pressure to a lower pressure and
control it to follow the main regulator upstream
pressure always at a fixed differential (approximately
5 PSI). Use this controlled following pressure through
the pilot circuit and to the top of the piston, where it will
operate the main valve independently of the main line
pressure drop. The controlled following pressure from
the A2BOP must be enough higher than the upstream
pressure to provide reliable operation at all times, but
not so high at any time as to cause excessive leakage,
which would reduce evaporator capacity.
All Type A4 Regulating Valves arranged for LPD
operation must also be sized for LPD operation.
The capacity of a regulator at 1/2 PSI pressure drop
will be 50% of the capacity at 2 PSI pressure drop for
the same inlet conditions.
The basic LPD assembly includes:
• Compensated pressure regulator (A2BOP)
• Gauge valves:
2 with inlet regulator, 3 with outlet regulator
• 760mm Hg to 10.5 bar (30" Hg to 150 lb.) gauges:
2 with inlet regulator, 3 with outlet regulator
NOTE: Not available with Variations E, L, K or R.
PISTON
A4E
A2BOP
SCHEMATIC
FLOW DIAGRAM
OF PILOT GAS CIRCUIT
INLET
HIGH PRESSURE GAS
A4E INLET
PRESSURE
PILOT
(WITHOUT
INTERNAL
FEED OF
INLET
PRESSURE)
GAUGES INCLUDED
SPECIFY
REFRIGERANT
1/4" MIN. PIPE SIZE
KEEP LESS THAN
3m (10') LONG
A2BOP PILOT
1/2" MIN PIPE SIZE
HIGH PRESSURE LIQUID FREE GAS
KEY:
FIELD PIPING AND VALVES
NOT INCLUDED WITH REGULATOR
★ See Table on Page 376
for available voltages for
coils and pilot lights.
Technical Information