Carrier 30HXA Installation Instructions Manual

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Contents

installation instructions

Terminals TB2-11 and TB2-12 are provided for field in-stallation of a chilled water (fluid) pump interlock (CWPI)and a chilled water (fluid) flow switch (CWFS). These de-vices are to be installed in series. Contacts must be rated forday circuit applications capable of handling a 24-vac to50 mA load.Accessory remote on-off switch can be wired into TB2-13and TB2-14. To use this feature, remove the factory-installedjumper and install the device in series. See Fig. 13 for re-mote on-off, CWPI, and CWFS wiring. Contacts must berated for dry load application capable of handling a 24-vacto 50 mA load.Do not use interlocks or other safety device contactsconnected between TB2 terminals 13 and 14 as remoteon-off. Connection of safeties or other interlocks be-tween these 2 terminals will result in an electricalbypass if the REMOTE-OFF-LOCAL switch is in theLOCAL position. If remote on-off unit control is re-quired, a field-supplied relay must be installed in theunit control box and wired as shown in Fig. 13. Failureto wire the remote on-off as recommended will result intube freeze damage.Terminals 2 and 3 of TB2 have been provided for afield-supplied remote alarm (ALM). If an audible alarm isinstalled, an alarm shutoff is also recommended. Contactsare rated for 125 va at either 115 or 230 v control power. SeeFig. 13.Terminals 4 and 5 of TB2 have been provided for afield-supplied chilled water (fluid) pump relay (CWP). Afield-supplied power supply of appropriate voltage must beprovided. Contacts are rated for 125 va at either 115 or230 v control power. See Fig. 13.Terminals 1 and 6 of TB2 have been provided for afield-supplied control relay for the remote condenser (30HXA)or a condenser pump relay (30HXC). A field-supplied powersupply of appropriate voltage must be provided.Step 5 — Install AccessoriesELECTRICAL — Several optional control accessories areavailable to provide the following features:• control transformer• cooler pump/flow switch interlock• cooler pump control• expanded display panel• remote alarm• remote on-off• pulldown control• occupancy scheduling• demand limit control• temperature reset (from occupied space or outdoor-airtemperature)• dual set point control• condenser water sensors• level II communications (CCN[Carrier Comfort Network])Refer to Start-Up and Operation literature and sepa-rate accessory installation instructions for additionalinformation.30HXA LOW-AMBIENT OPERATION — If outdoorambient operating temperatures below 60 F (15 C) are ex-pected, refer to separate installation instructions for low-ambient operation using accessory Motormastert III control.MINIMUM LOAD ACCESSORY — If minimum loadaccessory is required, use the appropriate package. Refer tounit Price Pages or contact your local Carrier representativefor more details. For installation details, refer to separate in-stallation instructions supplied with the accessory package.MISCELLANEOUS ACCESSORIES — For applications re-quiring special accessories, the following packages are avail-able: control power transformer, minimum load control, soundreduction enclosure, external vibration isolation, expandeddisplay, Victaulic-type connections, temperature reset sen-sor, and chilled fluid flow switch. Refer to individual acces-sory installation instructions for installation details.Step 6 — Leak Test Unit30HXC UNIT — These units are shipped from the factorywith a full charge of R-134a (See Tables 1A and 1B). Per-form a leak test to ensure that leaks have not developedduring unit shipment. Dehydration of the system is not re-quired unless the entire refrigerant charge has been lost. Thereare a number of Swage-Lok fittings used on the refrigerantpiping. If a leak is detected at any of these fittings, tightenoutside nut 1⁄8 turn.DO NOT OVERTIGHTEN THESE FITTINGS. Over-tightening will result in the tube being crushed and willcause a refrigerant system leak.30HXA UNITS — These units are shipped with a holdingcharge of R-134a. Leak test and dehydrate the complete sys-tem (including both field and factory installed piping).Step 7 — Refrigerant ChargeIMPORTANT: These units are designed for use withR-134a only. DO NOT USE ANY OTHER refrig-erant in these units without first consulting yourCarrier representative.The liquid charging method is recommended for com-plete charging or when additional charge is required.When charging, circulate water through the condens-er and cooler at all times to prevent freezing. Freezingdamage is considered abuse and may void the Carrierwarranty.DO NOT OVERCHARGE system. Overcharging re-sults in higher discharge pressure with higher coolingfluid consumption, possible compressor damage, and higherpower consumption.26

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