Multi-Zone Outdoor Condenser Installation Manual

DURASTAR.COM

Note on refrigerant valve selection for indoor units

For DRA3U28M1A and DRA4U36M1A:

If installing a 24,000 BTU indoor unit, only connect the unit to the valve ports labeled "A" on the

outdoor unit.

For DRA5U48M1A:

If installing one 24,000 BTU indoor unit, only connect the unit to the valve ports labeled "A" on the

outdoor unit. If installing two 24,000 BTU indoor units, only connect the units to the valve ports

labeled "A" and "B" on the outdoor unit.

REFRIGERANT PIPING CONNECTIONS

REFRIGERANT PIPE LENGTH

The length of refrigerant piping will affect the performance and efﬁciency of the unit. Nominal

efﬁciency is tested with a pipe length of 25 feet (7.6 meters). A minimum pipe run of 10 feet (3

meters) is required to minimize vibration and excessive noise.

Refer to the table on page 13 for speciﬁcations on the maximum length and drop height of

refrigerant piping.

WARNING

When connecting refrigerant piping, do not let substances or moisture other than

speciﬁed refrigerant enter the unit or pipes. The presence of foreign materials will

lower the unit's capacity and can cause abnormally high pressure in the refrigeration

system. This can result in explosion and personal injury.

Note on master valves

For DRA3U28M1A, DRA4U36M1A, and DRA5U48M1A:

Initial startup

Once installation is complete and a vacuum is maintained on all applicable zones, open both

master valves. Then, starting with valve A, open all valves connected to an IDU to allow the

release of refrigerant into those zones. After all the refrigerant is released, both master valves

and all zone valves connected to an IDU must remain open for proper operation.

Refrigerant connecting pipe sizes

for indoor units

Indoor Unit capacity

(Btu/h)

Liquid Gas

9K 1/4” 3/8”

12K &18K 1/4” 1/2”

24K 3/8” 5/8”

“A” and “B” valve ports.

DRA5U48M1A shown.

Master Valves