Carrier 30HXA Installation Instructions Manual

Also see for 30HXC116: Installation instructions

Contents

installation instructions

To install condenser piping:1. Remove bolts on weld flanges, and remove flanges fromcondenser water heads.Remove the weld flanges before welding piping tothe flanges. Refer to Fig. 1 and 2 for weld flangelocations. Failure to remove the flanges may dam-age the sensors and insulation.2. To keep debris from entering the heat exchanger duringshipping and storage, the gaskets between the weld flangesand the water heads do not have holes cut into them. Thegaskets have perforations where the holes are to be cut.Carefully cut a hole along the designated perforations.IMPORTANT: Be sure to remove flanges and cutholes in the gaskets between the flanges and the wa-ter heads as indicated.3. Apply a thin coat of oil to both sides of each gasket tohelp ensure a good seal, and reattach each gasket to eachwater head.4. Weld the field-supplied piping to the weld flanges.5. Bolt the weld flanges back onto their respective waterheads.IMPORTANT: When bolting the weld flanges to thewater heads, be sure to locate the flange such thatthe hole in each flange lines up completely with thehole in each water head. If installed incorrectly, partof the hole in the water head will be blocked off.This will result in impaired water flow in high pres-sure drop applications.Provide openings in water piping for pressure gages andthermometers (if used). These openings should be 5 to 10pipe diameters from the unit water nozzles. For thorough mix-ing and temperature stabilization, wells in the leaving waterpipe should extend at least 2 in. (50 mm) into the pipe.Accessory Victaulic-type connections and condenser-water thermistors are available. Follow the connection di-rections as provided with the accessory. If accessory differ-ential pressure switch, water flow switch, or condenser waterthermistor is to be installed, install the proper fittings intothe condenser water lines before water is connected.Although condenser has an air vent, it is recommendedthat a field-supplied air vent be installed in the system tofacilitate servicing. Field-supplied shut-off and balancing valvesshould also be installed to facilitate servicing and flow bal-ancing. Locate valves in inlet and outlet lines as close to thechiller as possible. Locate air vents at the highest point ofthe system loop. See Fig. 6.Provide drain connections at all low points in the loop topermit complete system drainage.For installations where entering condensing water tem-perature could be below 70 F (21 C), a field-suppliedleaving water temperature regulating valve is required.Operation below 70 F (21.1 C) without this valve may causethe unit to shut down on low oil pressure alarms.NOTE: This valve should be a temperature-controlledvalve (DO NOT USE a pressure-controlled valve) whichcontrols to 80 F (26.7 C) leaving water temperature. Be sureto add a bleed line between the entering and leaving waterlines.INSTALL PRESSURE RELIEF REFRIGERANT VENTPIPING — To facilitate refrigerant vent piping, units haveflares for all of the relief fittings. The low side relief valveson all units are provided with a 3/4 in. NPT flare connec-tions, and are located on the cooler shell. There are 2 reliefvalves for the cooler; one on each circuit.The 30HXA high side relief valve is provided with a5/8 in. SAE (Society of Automotive Engineers, U.S.A.) flareconnection. The 30HXC high side relief valves are providedwith a 3/4 in. NPT flare connection, and are located on thecondenser shell.There are 2 relief valves for the separator (30HXA) and2 for the condenser (30HXC); one for each circuit. Mostlocal codes require that these devices be piped to the out-side. If vent piping is required by local codes, these con-nections have been provided to aid in the connection of ventpiping in accordance with ASHRAE 15 (American Societyof Heating, Refrigeration, and Air Conditioning Engineers),Safety Code for Mechanical Refrigeration. If vent piping isrequired, do not restrict the vent flow in any way.NOTE: When accessory suction service valve kit is in-stalled, there are 2 additional high-side pressure relief valves.Pipe these valves per local codes. These are located on thedischarge line between the muffler and the discharge shut-off valve.Step 4 — Make Electrical Connections — Theelectrical characteristics of the available power supply mustagree with the unit nameplate rating. Supply voltage mustbe within the limits shown.FIELD POWER CONNECTIONS (See Fig. 12) — All powerwiring must comply with applicable local and national codes.Install field-supplied, branch circuit fused disconnect(s) of atype that can be locked off or open. Disconnect(s) must belocated within sight and readily accessible from the unit incompliance with NEC Article 440-14. See Tables 4A and 4Bfor unit electrical data. See Tables 5A and 5B for compres-sor electrical data.IMPORTANT: the 30HX units have a factory-installedoption available for a non-fused disconnect for unit powersupply. If the unit is equipped with this option, all fieldpower wiring should be made to the non-fused discon-nect since no terminal blocks are supplied.All units have a single location for power entry to sim-plify the field power wiring. Maximum wire size that theunit terminal block or non-fused disconnect will accept is500 kcmil.All 380/415-3-50, 460-3-60, and 575-3-60 units requirea single field-supplied power supply. All 230-3-50 and208/230-3-60 units require 2 separate field-supplied powersupplies.All 380-3-60 units (except the 30HXC/A186 units)require a single field-supplied power supply. The30HXC/A186 units require 2 field-supplied power supplies.The 30HXA136-186 and 30HXC171,186, 346-3-50 unitsrequire 2 field-supplied power supplies. All other 346-3-50units require a single field-supplied source.FIELD CONTROL POWER CONNECTIONS (SeeFig. 13) — Units with a power supply of 208/230-, 460-,and 575-3-60 require 115-1-60 control circuit power. Unitswith a 380-3-60 power supply require 230-1-60 control cir-cuit power. All other units 230-1-50 control circuit power.Field control power connections are made at terminals 1 and2 of TB4.Copy continued on page 26.14