Carrier HXC076-186, 30HXA installation instructions

To install condenser piping:

1.Remove bolts on weld ¯anges, and remove ¯anges from condenser water heads.

Remove the weld ¯anges before welding piping to the ¯anges. Refer to Fig. 1 and 2 for weld ¯ange locations. Failure to remove the ¯anges may dam- age the sensors and insulation.

2.To keep debris from entering the heat exchanger during shipping and storage, the gaskets between the weld flanges and the water heads do not have holes cut into them. The gaskets have perforations where the holes are to be cut. Carefully cut a hole along the designated perforations.

IMPORTANT: Be sure to remove ¯anges and cut holes in the gaskets between the ¯anges and the wa- ter heads as indicated.

3.Apply a thin coat of oil to both sides of each gasket to help ensure a good seal, and reattach each gasket to each water head.

4.Weld the ®eld-supplied piping to the weld ¯anges.

5.Bolt the weld ¯anges back onto their respective water heads.

IMPORTANT: When bolting the weld ¯anges to the water heads, be sure to locate the ¯ange such that the hole in each ¯ange lines up completely with the hole in each water head. If installed incorrectly, part of the hole in the water head will be blocked off. This will result in impaired water ¯ow in high pres- sure drop applications.

Provide openings in water piping for pressure gages and thermometers (if used). These openings should be 5 to 10 pipe diameters from the unit water nozzles. For thorough mix- ing and temperature stabilization, wells in the leaving water pipe 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 ¯ow switch, or condenser water thermistor is to be installed, install the proper ®ttings into the condenser water lines before water is connected.

Although condenser has an air vent, it is recommended that a ®eld-supplied air vent be installed in the system to facilitate servicing. Field-supplied shut-off and balancing valves should also be installed to facilitate servicing and ¯ow bal- ancing. Locate valves in inlet and outlet lines as close to the chiller as possible. Locate air vents at the highest point of the system loop. See Fig. 6.

Provide drain connections at all low points in the loop to permit complete system drainage.

For installations where entering condensing water tem- perature could be below 70 F (21 C), a ®eld-supplied leaving water temperature regulating valve is required. Operation below 70 F (21.1 C) without this valve may cause the unit to shut down on low oil pressure alarms.

NOTE: This valve should be a temperature-controlled valve (DO NOT USE a pressure-controlled valve) which controls to 80 F (26.7 C) leaving water temperature. Be sure to add a bleed line between the entering and leaving water lines.

INSTALL PRESSURE RELIEF REFRIGERANT VENT PIPING Ð To facilitate refrigerant vent piping, units have ¯ares for all of the relief ®ttings. The low side relief valves on all units are provided with a 3/4 in. NPT ¯are connec- tions, and are located on the cooler shell. There are 2 relief valves for the cooler; one on each circuit.

The 30HXA high side relief valve is provided with a 5/8 in. SAE (Society of Automotive Engineers, U.S.A.) ¯are connection. The 30HXC high side relief valves are provided with a 3/4 in. NPT ¯are connection, and are located on the condenser shell.

There are 2 relief valves for the separator (30HXA) and

2 for the condenser (30HXC); one for each circuit. Most local 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 vent piping in accordance with ASHRAE 15 (American Society of Heating, Refrigeration, and Air Conditioning Engineers), Safety Code for Mechanical Refrigeration. If vent piping is required, do not restrict the vent ¯ow 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 the discharge line between the muffler and the discharge shut- off valve.

Step 4 Ð Make Electrical Connections Ð The electrical characteristics of the available power supply must agree with the unit nameplate rating. Supply voltage must be within the limits shown.

FIELD POWER CONNECTIONS (See Fig. 12) Ð All power wiring must comply with applicable local and national codes. Install ®eld-supplied, branch circuit fused disconnect(s) of a type that can be locked off or open. Disconnect(s) must be located within sight and readily accessible from the unit in compliance with NEC Article 440-14. See Tables 4A and 4B for unit electrical data. See Tables 5A and 5B for compres- sor electrical data.

IMPORTANT: the 30HX units have a factory-installed option available for a non-fused disconnect for unit power supply. If the unit is equipped with this option, all ®eld power 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 ®eld power wiring. Maximum wire size that the unit terminal block or non-fused disconnect will accept is 500 kcmil.

All 380/415-3-50, 460-3-60, and 575-3-60 units require a single ®eld-supplied power supply. All 230-3-50 and 208/230-3-60 units require 2 separate ®eld-supplied power supplies.

All 380-3-60 units (except the 30HXC/A186 units) require a single ®eld-supplied power supply. The 30HXC/A186 units require 2 ®eld-supplied power supplies.

The 30HXA136-186 and 30HXC171,186, 346-3-50 units require 2 ®eld-supplied power supplies. All other 346-3-50 units require a single ®eld-supplied source.

FIELD CONTROL POWER CONNECTIONS (See Fig. 13) Ð Units with a power supply of 208/230-, 460-, and 575-3-60 require 115-1-60 control circuit power. Units with 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 and 2 of TB4.

Copy continued on page 26.

14