Heatcraft Refrigeration Products 25000102 Series P100 Pressure Control, Auto Reset Models

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Parallel Compressor Systems

Series P100 Pressure Control

The P100 series, manufactured by Johnson Control, Inc., are encapsulated, non adjustable, single-pole single throw, direct mount pressure controls typically used for low or high pressure cutouts. On the Heatcraft manufactured parallel systems, the control is used for High Pressure cutout.

There are two types available. Auto Reset Models and Manual Reset Models.

Figure 13.

Auto Reset Models

When pressurized to the selected actuation pressure setting, the internal snap-acting disc reverses its shape and drives a set of electrical contacts either open or closed. When the pressure drops below the de-actuation pressure setting, the disc snaps back to its preset position thus resetting the electrical contacts.

Manual Reset Models

The snap-acting disc in the manual reset model opens the electrical contacts when actuated by the pressure sensor. Once the disc snaps, the contacts are held open until an external force on the push button closes them. Because of the disc’s link with the pressure sensor, the contacts cannot be reset until the pressure drops to a predetermined level.

The latching mechanism inside the manual reset model is trip free. The electrical contacts will cutout even if the reset button is held fully depressed. The control can only be reset when the pressure returns to a predetermined level.

Liquid Level Switch

S-9400 Level Switch Series

OPTION – Not available on all systems or receivers.

Table 19. Level Switch Table

Cat.

Voltage

Resistive

Contacts

No.

Rating

Liq. Present

 

S-9420

208/240

.5 Amp

N.C.

50/60 Hz

 

 

 

 

 

 

 

 

 

 

 

Cat.

Wire Color

Replacement

Replacement

Sight Glass

No.

Code

Module No.

No.

 

 

 

S-9420

Red & White

2-044-015

3-020-063

 

 

 

 

Figure 14.

Operation

The S-9400 Series Level Switches manufactured by AC&R Components uses light reflecting from a conical glass prism as a means of detecting the absence of a fluid at the level of the glass cone. When no fluid covers the lower half of the cone, infra-red light from the module reflects from the mirror-like inner surface of the cone back to a light detector signaling the electronic module to switch. When fluid covers the lower half of the glass cone, the light from the module passes into the fluid. This absence of light is detected by the module which switches into the opposite direction. The module provides a

.06/.10 differential distance from the cone point down.

Parallel Compressor Systems Installation & Operations Manual, October 2004

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Contents Parallel Compressor Systems Table of Contents Inspection IntroductionUnit Designation Model DefinitionRigging System WarrantyLocation Of Equipment Indoor Clearances Floor & Foundation RequirementsGround Mounting Location of Equipment OutdoorRoof Mounting Unit Vibration IsolationVertical Clearance Unit AccessDecorative Fences Units in PitsElectrical Ventilation Requirements Indoor UnitsRefrigerant Piping Suction P-TrapsRefrigerant Line Support Refrigerant Line InsulationTable of Values for L Expansion LoopsRef. Line Amount of Expansion Equivalent Feet of Pipe Pressure Loss of Liquid RefrigerantsLiquid Line Rise in Feet Refrigerant 10’ 20’ 25’ 30’ 40’ 50’ 75’ 100’Suction Line at Suction Temperature Weight of Refrigerants in Copper Lines During OperationLine 40F 20F Recommended Line Sizes for R-404A/R-507 Expansion Valve Liquid Line SizeLengths 100’ 150’ 200’ 25’Suction Line Size Recommended Line Sizes for R-22Capacity 40˚F 20˚F 10˚F 10˚F Liquid Line Size Suction TemperatureNet Recommended Remote Condenser Line Sizes12 & R-134A 502 507 & R-404A TotalEvacuation Leak Checking, Evacuation and Start-upStart-up Off-Cycle Refrigerant DistributionElectric Defrost Priority I Hot Gas DefrostSystem Balancing Electronic Control SystemSystem Superheat Evaporator SuperheatCopeland Compressors 4D/6D Solid State Modules CompressorsTypical Voltage Ranges Unloader FactorsOil Charges Oil Safety SwitchApproved Copeland Lubricants Carlyle CompressorsPart Load Performance Multipliers Phase Voltage MonitorRequired Differential Pressure for Unloader Operation Sight Glass Safety Relief Devices Sight Glass & Moisture IndicatorDischarge Piping Table Henry Relief Valve Capacity RatingManual Reset Models Auto Reset ModelsLiquid Level Switch Level Switch TableOil Control Module ReplacementOil Separators Temprite Models Temprite Valve AdjustmentOil Level Regulators AC&R Model Regulators Troubleshooting Oil SystemLiquid Filter-Driers & Suction Filters Sporlan Valve CoSuction Filter CompressorMotorBurnoutCleanupProcedureSporlan Valve Company Replaceable Suction FilterType AFD for cleanup Type DF for cleanupSuperior Valve Company Type F FilterField Adjustment Recommended Valve SettingsHot Gas Bypass Regulator Adjustment Liquid Drain Control MethodControl Settings for R-404A/R-507 Control SettingsControl Settings for R-22 Low Pressure Switch Setting for RmccWeekly General Maintenance ScheduleMonthly QuarterlyTemperature Symptom Cause Remedy CompressorDoes Not Run Unit ShortSwitch Open Symptom Cause Remedy LowHigh Suction Low SuctionSystem Reference Data Service Record