Carrier 40QNB Installation, Start-up And Service Instructions Manual
Also see for 40QNB018: Owner's manualInstallation, Start-Up and Service Instructions
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d. Install factory-supplied flare connection and Accu-Rater metering device in liquid line at the fan coil uniton 38HDC, HDL and 38BK systems (Fig. 9). Makesure the arrow on the metering device body points AWAYFROM the fan coil unit. Use Table 5 to verify that thecorrect piston for your system has been shipped withthe unit.NOTE: No AccuRatert device is installed on 38HDSsystems. The 38HDS systems have a TXV (thermo-static expansion valve) in the condensing unit for re-frigerant metering and control.e. On heat pump installations, install factory-supplied pis-ton in the AccuRater metering device located in theservice valve on the outdoor unit (Fig. 10). Make sureTeflon seal on the piston faces toward the outdoor unit.Use Table 5 to verify the correct piston for your sys-tem has been shipped with the unit. Refer to 38BKinstallation instructions for more details.f. Install a liquid line filter drier near the outdoor unit(38HDC, HDL and 38BK). On heat pump systems, abi-flow filter drier must be used. DO NOT install a fil-ter drier in 38HDS systems.3. Insulate and caulk wall openings to reduce air infiltrationand refrigerant pipe vibrations on structure.4. Evacuate piping, if necessary. If either refrigerant pipingor the indoor coil is exposed to atmospheric conditions,it must be evacuated to 1000 microns to eliminate con-tamination and moisture in the system.Fig. 6 — Bracket MountingNOTE: Use either point ‘‘A’’ or point ‘‘B.’’Fig. 7 — Wall Hole Location for Rear PipingFig. 8 — Piping Hole6 |
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