Carrier 30GX080-176 user manual

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30GX080-176
30HX076-271
Minimum Load Control Accessory
50/60 Hz
Installation Instructions
Part Nos. 30HX-900---008, 30GX-900---004
(60 Hz — 115-v Control)
Part Nos. 30HX-900---009, 30GX-900---005
(50 or 60 Hz — 230-v Control)
Followallsafetycodes.Wearsafetyglassesandworkgloves.
CONTENTS
Use care in handling equipment.
Page
SAFETY CONSIDERATIONS...................1
INTRODUCTION..............................1
Besurepowertoequipmentisshutoffbeforeperform-
INSTALLATION .............................

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30GX—Cutplugendoffofminimumloadportbrazenipple Step 2 — Install Piping on discharge line, located between oil separator and con- denser.Removeplugfromminimumloadportoncoolershell. See Fig. 1. Using thread sealant, install Swagelok fitting in Shutoffallpowertotheunit,thenlockoutandsafety- minimum load port on cooler. Port on nipple in discharge tag all disconnects before proceeding with installation. line is reserved for a brazed connection. 30HX— Remove plugs from minimum load ports on the cooler

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INSTALLBALLANDSOLENOIDVALVES—Usinggood IMPORTANT:DoNOTovertightenthefittings.Over- piping practice, braze ball valve and solenoid valve into 5 tightening the fittings can deform the tube ends and ⁄8-in. minimum load piping. Fig. 2 shows a typical 30HX cause leaks. installationandFig.3showsatypical30GXinstallation,in- cludingvalvelocationsandorientation.Ensurethatballvalve is fully open, and that both the ball and solenoid valve are 30GXUNITSONLY—Usinggoodbrazingpractice,braze 5 protectedfromexcess

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Fig. 3 — Installing Valves, 30GX 30GXUNITS—Installtheaccessoryjunctionboxincluded Step 4 — Install Control Wiring with this kit in the position shown on the 30GX chiller in Fig. 3. Route the waterproof conduit included with this kit betweentheaccessoryjunctionboxandthefactory-installed Be sure all power to the unit is off before proceeding. junctionbox.SeeFig.3and4.Routefield-suppliedconduits Lock out and safety-tag all disconnects. from the solenoid valves to the accessory junction box. ALLUNITS

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30GX080-176 30HX076-271 LEGEND MLC — Minimum Load Control TB — Terminal Block NOTE: See Fig. 3 for locations of junction boxes on unit. Fig. 4 — Minimum Load Control Wiring 5

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Step5—ConfigureUnitforMinimumLoadCon- 8. Press to turn off the minimum load valve relay trol— Oncethepipinginstallationandwiringinstallation for CircuitA. are complete, the chiller must be configured for minimum TochecktheoperationofthesolenoidvalveonCircuitB, loadcontroloperation.Thismaybedoneusingtheunitkey- follow the same procedure as the preceding, but enter pad (HSIO-2). Set the LOCAL/OFF switch in the OFF position. enter in Step 1, instead of . The display screens will be for Circuit B inst

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Copyright 1997 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 2 PC 903 Catalog No. 563-056 Printed in U.S.A. Form 30GX,HX-2SI Pg 8 1-97 Replaces: New Tab 5c