Rheem RAMP-JEZ Installation Instructions - Page 19

HARD START COMPONENTS Start components are not usually required with the scroll compressors used in (-)ANL/(-)APL/(-)APM condensing units, but are available for special cases and where start components are desirable to reduce light dimming. TIME DELAY CONTROL (TDC) The time delay (TDC) is in the low voltage control circuit. When the compressor shuts off due to a power failure or thermostat operation, this control keeps it off at least 5 minutes which allows the system pressure to equalize, thus not damaging the compressor or blowing fuses on start-up. LOW AMBIENT CONTROL (LAC) This component senses compressor head pressure and shuts the condenser fan off when the head pressure drops below designated levels. This allows the unit to build a sufficient head pressure at lower ambient in order to maintain system balance and obtain improved capacity. Low ambient control should be used on all equipment operated below 65°F ambient. OUTDOOR UNIT COVERS Outdoor condensing unit covers are available if the homeowner requests a cover for their unit. With the complete model number for the unit, the correct cover can be obtained through an authorized distributor. ! CAUTION FAILURE TO REMOVE CONDENSING UNIT COVER BEFORE OPERATING OUTDOOR UNIT CAN CAUSE COMPONENTS TO FAIL. SERVICE SINGLE-POLE COMPRESSOR CONTACTOR (CC) Single-pole contactors are used on all standard single phase units up through 5 tons. Caution must be exercised when servicing as only one leg of the power supply is broken with the contactor. Two pole contactors are used on some three phase units. 19