SA 3 134a - Sea Frost Refrigeration

More documents

Recommendations

Info

a) If the refrigerator box and SEA FROST plates are warm and pressure readingsare below 50 psi with the compressor off (in 50 degree F or higher ambient conditions)pressurize system with R-134a and leak-check. After leaks have been located,repaired, and tested, install new RFD (Receiver/filter/drier) - see instructions below inStep 3.b) If pressure reading is over 50 psi with compressor off, proceed to check thecharge level via sight glass and charge if needed.CHARGE LOSS INDICATES A LEAK THAT MUST BE CORRECTEDSTEP 2. If a system continues to operate inefficiently after Step 1, check for moistureor dirt plugging the valve. Run the system, observing closely the gauge readings andplate temperature, noting the following.a) If system is warm upon start-up, a DIRT-PLUGGED Valve will show animmediate deep vacuum reading on low side. Consult SeaFrost for cleaningtechniques.b) MOISTURE-PLUGGED VALVE on a properly charged system is indicated bydeep vacuum readings on low side after a few minutes of operation from warm, followedby any combination of these symptoms:• High side compressor discharge fitting temperature drops from hot to warm.• Suction line from Valve Unit remains warm.• Compressor currents draw drops (running amperes).• Moisture enters either through a low side leak or during initial installation and willfreeze at the Valve Unit, reducing or eliminating refrigeration. Turning off systemand allowing the valve to warm to above freezing, and then restarting, maytemporarily solve the problem. If not, change RFD as follows.STEP 3. To change a saturated RFD, allow the system to warm to ambienttemperature, thereby preventing moisture from condensing in the circuit upon opening.(A light bulb in the refrigerator box will speed the warming of the plates. Recover therefrigerant from system through the suction service port SLOWLY to prevent liquid andoil from escaping. WARNING: BEFORE DISASSEMBLY OF ANY PART IN THISSYSTEM BE SURE CHARGE IS COMPLETELY RECOVERED. With a backup wrenchholding the brass body of the Swagelok fittings, loosen and back off the nuts. The tubingmay be pulled out of the fittings. Remove the RFD. Replace only with an identical unitby size and color: THE SEAFROST RFD is a drier and also a receiver/filter. TheDESICCANT and the oil in the Sea Frost RFD are special to this system and R-134a. Installation of the wrong part or oil will destroy the system.28
NOTE: This system contains a measured amount of lubricating oil. Be sure the RFDbeing installed is a gray SEA FROST SA-III R-134-a RFD. Record all componentexchanges in this on-board owner's manual.Follow the "re-make" instructions for Swagelok fittings.Reminder: To ensure the total removal of moisture from the system use a high vacuumpump, and evacuate the system with the highest possible plate temperature (100degrees F.). A light bulb or heat lamp in contact with the plates is a good technique.Recharge. Refer to "Recharging section"MOISTURE IS A SYMPTOM. Carefully leak check the low side of the system ifmoisture becomes a problem. Moisture leaks in!CALL US WITH ANY QUESTIONSINTERNATIONAL 603-868-5720TOLL FREE IN THE UNITED STATES,800-435-6708FAX 603 868 1040SHIPPING AND MAIL:SEA FROST148 OLD CONCORD TURNPIKEBARRINGTON, NH 03825 USAE-mail sales@seafrost.comwww.seafrost.com29
Page 1 and 2: 148 OLD CONCORD TURNPIKE BARRINGTON
Page 3 and 4: SA-III OPERATIONThe SEAFROST SA-III
Page 6 and 7: It is IMPORTANT that NO WATER flows
Page 9 and 10: NOTES ON SWAGELOK FITTINGSSwagelok
Page 11: * SWAGELOK FITTINGS ARE TO BE TIGHT
Page 14 and 15: The RFD is a reservoir for excessre
Page 16 and 17: REFRIGERANT HANDLING AND SAFETYDo n
Page 18 and 19: ACCESS TO THE SYSTEM: SERVICE PORTS
Page 20 and 21: Disconnecting the gauge set on a st
Page 22 and 23: LEAK CHECKINGLeak checking is a ver
Page 24 and 25: READING THE SIGHT GLASSA clear sigh
Page 26 and 27: CHECKING THE REFRIGERANT CHARGEPERI
Page 30 and 31: WATER CIRCUIT30
Page 32 and 33: 148 OLD CONCORD TURNPIKE BARRINGTON

SA 3 134a - Sea Frost Refrigeration

Create successful ePaper yourself

Delete template?

Save as template?