Assessments - 4, GPA: 3.3
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For medium temperature (R-134a) applications, an 06EM compressor is standard. Factory substitutions may be made. Contact Carrier Sales Representative. †The condenser listed is for R-22, air conditioning duty and may change based on the application. Maximum condenser operating pressure: 350 psi refrigerant side, 150 psi water side. START-UP Energize crankcase heater at least 24 hours prior to start-up. Check to see that oil level is approximately 1/3 up on the compressor sight glass. Open water supply valve and allow water to reach condenser. (Turn condenser fan on when the compressor unit is applied with air-cooled condenser.) Backseat the compressor suction and discharge shutoff valves; open liquid line valve at receiver. Start evaporator fan or chilled water pump. Do not attempt start-up with terminal cover removed from compressor. Bodily injury or death may result from explosion and/or fire if power is supplied to compressor with the terminal cover removed or unsecured. See warning label on terminal cover. Start Compressor — Push the control circuit STARTSTOP- RESET switch to START. The timer motor starts immediately. Depending on the position of the timer, the compressor start is delayed for 12 seconds to approximately 8 minutes. Check oil pressure after compressor has run a few minutes; the pressure should be 12 to 18 psi above the suction pressure. After about 20 minutes of operation, stop the compressor. Allow it to be idle for about 5 minutes, then observe the oil level in the sight glass. Refer to the Carrier Standard Service Techniques Manual, Chapter 1, Section 1-11, for adding oil. The proper oil level for the 06E compressor is approximately 1/3 up on sight glass. Timer Functions (See Fig. 7 — Timer Cycle.) 1. Switch A (contacts A-A1 and A-A2) provides Time Guard® function. Start of compressor is delayed approximately 5.5 minutes after shutoff. The minimum time between starts of compressor is 8 minutes. 2. Switch B (contacts B-B1 and B-B2) starts compressor and deenergizes the crankcase heater. These contacts also provide one-second time delay for part-winding start. 3. Switch E (contacts E-E1) provides approximately 40-second bypass of oil pressure switch (OPS) at start-up. Compressor will shut off if sufficient oil pressure does not build up. 4. Switch D (contacts D-D1) bypasses the low-pressure switch (LPS) for 2.5 minutes at start-up for winter start control. Fig. 7 — Timer Cycle 8 SERVICE Protection Devices HIGH-PRESSURE SWITCH — Check by throttling condenser water or blocking airflow on air-cooled units, allowing head pressure to rise gradually. Check discharge pressure constantly throughout procedure. Compressor should shut off within 10 psi of values shown in Table 4. LOW-PRESSURE SWITCH — Check by slowly closing suction shutoff valve or by completely closing liquid line shutoff valve. A decrease of suction pressure will follow. Compressor should shut off within 4 psi of values shown in Table 4. OIL PRESSURE SWITCH (OPS) — The oil pressure switch protects against damage from loss of oil or loss of oil pressure during unit start-up. If the oil pressure differential sensed by the OPS is 6 psig or less on unit start-up, the switch remains closed and the OPS heater is energized. The switch time delay is approximately 45 seconds. If after 45 seconds the oil pressure differential sensed by the OPS is less than 11 psig, the heater remains energized. The OPS temperature actuated switch then opens and the compressor is deenergized. If the differential reaches 11 psig, the OPS opens and deenergizes the heater and the system operates normally. See Table 4. IMPORTANT: If the oil pressure switch causes unit lockout, determine and correct the cause of the lockout (such as loss of compressor oil or flooded compressor) before restarting the unit. Failure to correct the cause of OPS lockout may constitute abuse. Equipment failure due to abuse is not covered by warranty. To restart the unit, push the OPS reset button and then push the control circuit switch on the unit control box to OFF and then to ON. Table 4 — Factory Switch Settings SWITCH TYPE PRESSURE CHANGE AFFECTING SWITCH POSITION (psig) Closed Open High Pressure 210 (±10) 290 (±10) Low Pressure 70 (±4) 60 (±4) Oil Pressure 6 11 NOTES: 1. Values for the high- and low-pressure switches based on R-22. For other refrigerants, reset to pressure corresponding to saturation temperatures indicated by the listed pressures. 2. Values for oil pressure are above operating suction pressure (pressure differential between suction and discharge pressures of oil pump). TIME GUARD® CONTROL — The Time Guard control protects against short cycling. See Start Compressor. CRANKCASE HEATER — The crankcase heater prevents absorption of liquid refrigerant by oil in crankcase during brief or extended shutdown periods. Source of 115-volt power is the auxiliary control power, independent of the main unit power. This assures compressor protection even when main unit power di...
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