Carrier 50AH024-096 FLANGEa50-8551, Self Sealing Coupling, a50-8552, Tubing Installation

Condensing section must be located in same plane as, or above, evaporator section to maintain the liquid refrigerant seal at the expansion device. This permits expansion device to feed liquid refrigerant to evaporator coil properly. To split sections (some of the following steps may be eliminated depending on particular application):

1.Disconnect all electrical power to unit.

2.Remove the 10 size 10 drive screws that hold on the top tie strap.

3.Remove the 8 size 3/8-in. drive bolts that hold on each side angle.

4.Control panel access panels are held on with 2 size 10 drive screws for each panel. A standard 50AH024-060 unit has one control panel located in the evaporator sec- tion. A standard 50AH072 or 096 unit has a control panel in both the evaporator and condenser sections.

5.Units have resealable fittings. Do not cut refrigerant pip- ing. See Interconnecting Refrigerant Tubing section be- low for procedure on installing tubing.

6.Install evaporator and condensing sections in desired locations.

7.Use sufficient length of refrigerant piping to reconnect piping cut in previous step. Refer to Carrier System Design Manual, Part 3, for additional piping data.

8.Recharge unit with R-410A. See Refrigerant Charge sec- tion on page 18 for more information.

After splitting sections, additional refrigerant must be added to system to ensure proper refrigerant charge. The amount of refrigerant to be added depends on length of tubing added to system and operating temperatures of system. Refer to Carrier System Design Manual, Chapter 3. Allow unit to operate at least 10 minutes before adjusting refrigerant charge.

Since standard roomtop unit has negligible line losses, split- ting the system can increase line loss and decrease system capacity. Capacity reduction can be determined by referring to Carrier System Design Manual.

INTERCONNECTING REFRIGERANT TUBING — The interconnecting tubing kit comes with all factory-optional split- table units. After the separated sections have been installed, the interconnecting tubing can be run, using the self-sealing cou- plings supplied in the interconnect tubing kit (see Fig. 7 and 8).

SELF-SEALING	SELF-SEALING
COUPLING	COUPLING
(MALE HALF)	(FEMALE HALF)

SCREWS

SELF-SEALING

FLANGEa50-8551

Fig. 7 — Self Sealing Coupling

For dual circuits, 2 kits are supplied. It is recommended that some refrigerant oil be placed on the coupling threads to facili- tate threading.

Perform the following procedure:

1.For condensing section, hand thread the female halves of the self-sealing couplings (supplied with the interconnect tubing kit) onto the male couplings (factory supplied and installed on the condensing section). Turn union nut ap- proximately 1 to 11/2 turns. This is to make sure that the interconnecting tubing will be routed and brazed with the self-sealing couplings in their final proper location, so that there will be no difficulty when the final coupling as- sembly is made.

2.For evaporator section, hand thread the male halves of the self-sealing couplings (supplied with the interconnect tubing kit) onto the female couplings (factory supplied and installed on the evaporating section). Turn union nut approximately 1 to 11/2 turns. This is to make sure that the interconnecting tubing will be routed and brazed with the self-sealing couplings in their final proper location, so that there will be no difficulty when the final coupling as- sembly is made.

3.Run the interconnecting tubing required.

NOTE: Installations may be made with up to 50 ft equiv- alent line lengths by installing the recommended tube siz- es and adding the necessary refrigerant. For equivalent line lengths greater than 50 ft, contact Carrier for line siz- ing and additional accesories required.

IMPORTANT: On units with more than one refrig- erant circuit, be careful not to intermix lines of the various circuits. If the connections were labeled before disconnecting the couplings, this should not be a problem. Half couplings may be removed to make brazing to the interconnecting tubing more convenient.

	D		D
C	A	B	C	A

EVAPORATOR			CONDENSING
SECTION	D	D	SECTION

C A B C A

A — Male self-sealing fittings
B — Refrigerant piping between sections	a50-8552
C — Female self-sealing fittings

D — Schrader fittings

Fig. 8 — Tubing Installation

CAUTION

When brazing tubing to the self-sealing couplings, be sure to use a wet rag, running water bath or chill blocks on the quick-connects to prevent overheating the valves and dam- aging the seals.

4.The interconnect tubing kit contains a sufficient number of Schrader access valves to permit installation of one in each end of both the liquid and suction lines of the field- supplied tubing. Each interconnecting line (suction, liq- uid, hot gas) must have one of the supplied Schrader ac- cess fittings installed into the field-supplied tubing, how- ever, for short lengths of tubing, only one Schrader in each line is necessary. Install the Schrader valve fittings into the tubing before brazing the couplings onto the ends

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