Carrier 40QNB018 Installation, Start-up And Service Instructions Manual

Also see for 38BK-018: Owner's manual

Contents

If mounting bracket is not mounted level, the indoor sec-tion will be mounted unevenly, and condensate drain-age water may drip onto the floor. Also, a gap betweenthe bracket and the wall may result in vibration and noisefrom the indoor section.5. Mark and cut condensate and piping holes.a. For piping through the wall, mark the wall below thecondensate connection and cut a 21⁄ 2-in. hole into thewall at either point ‘‘A’’ or point ‘‘B’’ in Fig. 7.NOTE: The 21⁄2-in hole must be made at a downward slopeto ensure proper condensate drainage. See Fig. 8. Slopecondensate line at a minimum pitch of 1⁄4 in. per foot ofline. The condensate line cannot be run up for upper pip-ing connections − only refrigerant lines may be run up.b. Push the wall sleeve (factory supplied with the unit)through the 21⁄2-in. wall opening.Step 4 — Connect Refrigerant Piping — Fan coilunits may be connected to the outdoor units using field-supplied refrigerant grade piping. Refer to Table 3 for thecorrect size piping. The length of refrigerant pipe dependson the unit placement and building structure; run pipes asdirectly as possible. For piping requirements over 50 ft oftotal run, or more than 25 ft of lift, consult the long lineapplication guidelines available in the product presale lit-erature, or contact your local representative.DO NOT BURY MORE THAN 36 IN. OF REFRIG-ERANT PIPE IN THE GROUND. If any section of pipeis buried, there must be a 6-in. vertical rise to the valveconnections on the outdoor unit. If more than the rec-ommended length is buried, refrigerant may migrate tothe cooler, buried section during extended periods of unitshutdown, causing refrigerant slugging and possible com-pressor damage at start-up.Use the following instructions to connect piping.1. Install insulation. Insulate all refrigerant lines on heat pumpsand 38HDS systems to prevent condensation. It is ex-tremely important that all refrigerant lines and theAccuRatert metering device be insulated on heat pumps.On 38HDC cooling only units, the liquid line may be leftuninsulated. Use any acceptable heat resistant closed-cellfoam insulation (minimum 3⁄8 -in. wall thickness). Wheninsulating piping, cap ends and slide insulation over thepiping. Insulation can also be cut and placed over piping.2. Run liquid and gas refrigerant piping.a. Run pipes as directly as possible, and avoid any un-necessary turns and bends.b. Suspend refrigerant pipes so that the insulation is notdamaged and vibrations are not transmitted to thestructure.c. Leave slack in the refrigerant pipe between the struc-ture and the unit to absorb vibrations.d. Install factory-supplied flare connection and Accu-Rater metering device in liquid line at the fan coil uniton 38HDC and 38BK systems (Fig. 9). Make sure thearrow on the metering device body points AWAY FROMthe fan coil unit. Use Table 4 to verify that the correctpiston for your system has been shipped with the unit.Fig. 6 — Bracket MountingNOTE: Use either point ‘‘A’’ or point ‘‘B.’’Fig. 7 — Wall Hole Location for Rear PipingFig. 8 — Piping Hole5