PRESSURE REGULATOR OPR Series

CRANKCASE

The OPR regulator is designed to protect the compressor from overloading due to high suction pressure. Acts to limit crankcase pressure to a pre-determined maximum pressure. Can be mounted in vertical or horizontal posi- tion in the suction line as close as possible to the compressor. All regulators have a 0-60 psi adjustment range with a factory setting of 30 psi. Standard features include an inlet strainer to protect the valve against contaminant’s and an inlet connection pressure tap. Safe working Pressure is 300 psi for model OPR-6 and 200 psi for model OPR-10. Should not be used for hot gas bypass applications. Suitable for use in R-12, R-22, R-500, R-502, R-134a, R-404A and R-507 systems.

4R757

CAT. NO. MFG. NO. CONNECTIONS ADJ. PRESSURE RANGE 0-60 psi

OPR-6 7/8” O.D.

FACTORY SETTING 30 psi

EACH $219.50 SYSTEM EVACUATION A system evacuation consists of the following steps: IPR Series

EVAPORATOR PRESSURE REGULATORS

Installed near the evaporator in the suction line, the IPR series valve is designed to maintain a pre-determined minimum evaporator pressure at or above a given set point at minimum load conditions. Operates from an inlet pressure signal, opening on a rise in pressure above the valve set point and closing at any inlet pressure below the set point.

Available with either 0-50 psi or 30-100 psi adjustment range. Inlet connection pressure tap and inlet strainer are standard. Compact design permits installation in either a vertical or horizontal line using minimal space.

Safe working pressure is 300 psi for model IPR-6 and 200 psi for model IPR-10. For use in R-12, R-134a, R-22, R-500, R404A, R-502 and R-507 systems.

CAT. NO. MFG. NO. CONNECTIONS ADJ. PRESSURE RANGE 0-50 psi

4R750 4R751 4R753

IPR-6 IPR-6 IPR-6

5/8” O.D. 5/8” O.D. 7/8” O.D.

30-100 psi 30-100 psi

FACTORY SETTING 30 psi 60 psi 60 psi

EACH

$252.53 $252.53 $252.53

1. Flush system prior to beginning a system evacuation. 2. Replacement of system drier. 3. Evacuation of system down to at least 500 microns 4. System held at 500 microns or lower for minimum 10 min.

The system evacuation steps are designed to remove particu- lates during the flush, then remove air during the evacuation, and finally remove moisture as the vacuum on the system ap- proaches the 500-micron range.

The flush removes brazing flakes, particulates, acids, burned oils, etc. The drier is replaced in order to trap any remain- ing particulates, and inevitably to trap any minute amount of moisture that may be remaining after the evacuation process has been completed. Skip any of the recommended steps and the system suffers.

For instance, skip the very last part of the last step. If the system was pulled down, but the hold time period was not adhered to, there is a strong possibility of moisture content in the system. If the hold period was adhered to, the service contractor might have noticed the micron readings increased, indicating moisture in the system was boiling off.

It may take a while for the results of the missed step to show up, or it may show up immediately. How many times have you heard of “sticking TXV’s, or sticking reversing valves, or pistons clogged, or compressors locked up, or compressors burned out”? Any one of these failures may be the direct result of a missed step in the system evacuation process.

Always perform complete step-by-step system evacuation. The potential for service problems will be reduced exponentially.

HP Series HeadMaster®

HEAD PRESSURE CONTROLS Three-way diverting valves designed to maintain

proper air-cooled condenser pressures during periods of low out- door ambient temperature. By controlling liquid refrigerant pres- sure, the HeadMaster® maintains liquid subcooling and prevents liquid line flash gas. Capacity at 1.0 psi pressure drop.

CAT. NO. MFG. NO.

4R680 4R681

HP8T7-95 HP8T7-170

CONNECTIONS NOMINAL TONS CAPACITY R-134-A 5.5 ---

7/8” O.D. 7/8” O.D.

R-22 EACH --- 6.0

$256.21 $256.21

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REFRIGERATION EQUIPMENT & SUPPLIES