Carrier 90MA, 90MU specifications Connection Locations

a.Route regulating valve capillary with its flare nut to the fitting on refrigerant discharge line (Figure. 1), using any convenient unused opening on side of unit. Use a grommet in panel to prevent chafing of capillary.

b.Remove cap from discharge line fitting.

c.Remove cotter pin taped to discharge line fitting. Insert

pin, split end first, into regulating valve flare

d. Hold flare tightly against fitting while connecting flare nut. Round end of cotter pin will depress core of fitting. The opened fitting allows refrigerant pressure to act on water regulating valve. Tighten nut to prevent leakage. Fitting automatically seals when nut is removed.

90MU UNITS-Install remote mounted condenser in accordance with the installation instructions provided with condenser. Recommended line sizes are given in Table 3. Additional instructions can be found in Carrier System Design Manual, Part 3, for standard refrigeration piping techniques. On *08 and *12 size units, secure discharge line to bracket at unit outlet using proper clamp from supplied fastener package

Condenserless (90MU) units are shipped with a refrigerant holding charge. After refrigerant connections are made, leak test, reclaim refrigerant, evacuate, and charge system as described in “Service, Charging The System”.

A = Condensate, ¾ inch Female Pipe Thread,

B = Electrical Opening,

C = Condenser In, 1 inch FPT,

D = Condenser Out, 1 Inch FPT

FIGURE 6 - CONNECTION LOCATIONS

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations

Printed in U.S.A. Pg 10 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009