Carrier 00EFN900003000A installation instructions

12.Using the accessory-supplied M6 screws (3000A or 3100A: Item 6), install the accessory-supplied junction box (3000A or 3100A: Item 5) at the desired location where the entering and leaving water thermistor cables can be conveniently spliced. One or two knockouts can be used. Follow all local codes. Remove one knockout from the junction box and install the field-supplied strain relief at the knockout hole. If using field-supplied conduit to provide mechanical protection to the thermistor wires between the cooler and the 30XA base unit, remove another knockout.

13.To reconnect the thermistors, locate the entering water thermistor and leaving water thermistor and cut both leads where they can be spliced in the installed junction box. Cut, strip, and label both sides of the entering water thermistor lead “EWT.” Cut, strip, and label the leaving water thermistor lead the same way, with “LWT” on both sides. See Fig. 13.

14.Run the labeled thermistor leads connected to the unit into the installed junction box and tighten the field- supplied strain relief. Strip back the lead jackets to expose the two wires in each lead.

15.Take one of the accessory-supplied 5-wire jacketed ca- bles (3000A or 3100A: Item 3) to connect the thermistor leads in the installed junction box to the cooler location. Each wire in the jacketed cable is a different color. Cut the cable into two pieces so that each has a maximum length of 100 ft (30.5 m).

16.Select one jacketed cable and strip back the jacket on both ends to expose the five wires. Pick any two wires and label both ends of each wire “EWT.” Pick another pair of wires and label both ends “LWT.” The fifth wire is not used. See Fig. 14.

17.Run one end of the accessory-supplied 5-wire jacketed cable into the installed junction box and splice the identi- cally labeled thermistor leads. Solder the splices and insu- late them to prevent shorting. Tighten the field-supplied strain relief for the cables.

18.Run the other end of the accessory-supplied 5-wire jacketed cables back to the cooler. Splice the labeled jacketed cable wires to the matching thermistors. If a second junction box is necessary at the cooler location, use the second accessory-supplied junction box (3000A or 3100A: Item 5).

19.Reinstall the thermistors in the correct cooler wells.

20.To reconnect the suction pressure transducers (SPT), locate the SPT plugs for circuits A and B, and cut the leads where they can be conveniently spliced in the installed junction box at the 30XA base unit. Label the leads “SPTA” for the circuit A lead, and “SPTB” for the circuit B lead.

21.Take the two pieces of accessory-supplied transducer wire harness (3000A: Item 16 or 3100A: Item 14). One side of the harness is a plug and the other side is three wires in red, black, and green. Label both sides of one harness “SPTA,” and label the other harness “SPTB.” Remove one knockout from an installed junction box and install a field-supplied strain relief valve at the knockout hole. If using field-supplied conduit to provide mechani- cal protection to the transducer wires between the cooler and the 30XA base unit, remove another knockout.

22.Run the labeled transducer leads connected to the unit into the installed junction box at the 30XA base unit and tighten the field-supplied strain relief. Strip back the lead jackets to expose the three wires, black, red, and white.

23.Run the lead end of accessory-supplied transducer wire harnesses into the junction box and splice the identically labeled leads. The red wire should go with red wire, the black wire with the black wire, and the white wire with the green wire. Solder the splices and insulate them to prevent shorting. Tighten the field-supplied strain relief for the cables and secure the accessory-supplied junction box cover (3000A or 3100A: Item 6) with accessory- supplied M6 screws.

24.Run the plug end of the accessory-supplied transducer wire harness back to the cooler. Connect the “SPTA” plug into the circuit A transducer. Connect the “SPTB” plug into the circuit B transducer. See Fig. 13.

25.Charge the unit to the amount of refrigerant as specified on the 30XA base unit nameplate. Because of longer field-installed liquid, economizer, and suction lines, addi- tional charge is needed. Refer to Table 7 to calculate the additional charge for each circuit and then add it to the nameplate charge. Additional charge for the economizer line is NOT required.

26.Perform all pre-start-up and start-up procedures specified in the unit operation instructions. Follow the checklist provided with the unit operation instructions.

27.Verify unit operation.

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