Carrier 50BV020-064 Complete Electrical Connections, B - Economizer Pressure Drop Curve

Table 7B — Economizer Pressure Drop Curve

(ft wg), 50BVT,U,V,W,X Units

FLOW RATE	SIZE 034	SIZE 044	SIZE 054	SIZE 064
(gpm)		Pressure	Drop (ft wg)
60	13.1	—	—	—
70	17.9	—	—	—
80	23.5	5.8	—	—
90	29.8	7.3	—	—
100	36.9	9.1	9.0	—
110	44.8	11.0	11.0	—
120	53.4	13.1	13.1	13.1
130	—	15.4	15.4	15.4
140	—	17.9	17.9	17.9
150	—	20.6	20.6	20.6
160	—	23.5	23.5	23.5
170	—	—	26.6	26.5
180	—	—	29.8	29.8
190	—	—	33.3	33.2
200	—	—	36.9	36.8
210	—	—	—	40.7
220	—	—	—	44.7
230	—	—	—	48.9
240	—	—	—	53.3

LEGEND

GPM — Flow Rate

TRAP (MUST BE

ABOVE TOP OF

CONDENSER COIL)

SLOPE

TOWARD

CONDENSER

LIQUID

LINE

HOT GAS

LINE

50BV

UNIT

REMOTE

CONDENSER

a50-7270ef

PD — Pressure Drop (ft wg)

REMOTE REFRIGERANT PIPING (Remote Air-Cooled Only) — Carrier 50BVE,K,U,X units are supplied without condensers. To complete the installation, these units must be field connected to a suitable remote condenser. The 50BV units from 18 to 30 tons contain 2 equally sized independent refriger- ant circuits. Units from 40 to 60 tons have 4 separate equal ca- pacity refrigerant circuits. It is important that the condenser cir- cuiting be properly matched to the 50BV unit circuiting. Other- wise, unsatisfactory operation will result. Carrier will not be responsible for improperly matched remote condenser selec- tions. Recommended condenser matches are shown in Table 8.

Table 8 — Recommended Condenser Matches

for 50BVE,K,U,X Units

50BV	NO. OF	CONDENSER(S)	CONDENSER
	CKTS		CIRCUITING
020	2	09DK020 (1)	50/50%
024	2	09DK024 (1)	50/50%
028	2	09DK028 (1)	50/50%
034	2	09DK034 (1)	50/50%
044	4	09DK024 (2)	50/50% (each)
054	4	09DK028 (2)	50/50% (each)
064	4	09DK034 (2)	50/50% (each)

Install the air-cooled condenser or condensers according to the installation instructions provided with the condenser(s). Connection locations and sizes for the hot gas and liquid lines on the 50BV units are shown in Fig. 2-14, 22 and 23. For 50BV units up to 30 tons, there will be 2 hot gas lines and 2 liq- uid lines to install between the unit and the condenser. Above 30 tons, 4 hot gas lines and 4 liquid lines will be installed be- tween the unit and the 2 condensers. Refer to the System De- sign Manual, Part 3 for standard refrigerant piping techniques. Also see the air-cooled condenser installation instructions for additional guidance.

Remote air-cooled 50BV units (only) are shipped with a dry nitrogen holding charge. After refrigerant connections are made, release nitrogen, evacuate, leak test, and charge the system as described in Charging the System in the Mainte- nance section of this manual.

Fig. 22 — System with Condenser

Above Evaporator

a50-7271ef

50BV

UNIT

HOT GAS

LINE

LIQUID

LINE

SLOPE TOWARD

CONDENSER

REMOTE

CONDENSER

Fig. 23 — System with Evaporator

Above Condenser

Step 5 — Complete Electrical Connections —

Verify that electrical requirements listed on the unit nameplate match available power supply. The unit voltage must be within the range shown in Tables 9A and 9B and phases must be balanced within 2%. Contact the local power company for line voltage corrections. Never operate a motor where a phase im- balance in supply voltage is greater than 2%.

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