Carrier 50BV020-064 A - Hot Water Pressure Drop, 50BVC,E,J,K,Q Units, B - Hot Water Pressure Drop

Table 6A — Hot Water Pressure Drop

50BVC,E,J,K,Q Units

FLOW RATE	SIZE 020	SIZE 024	SIZE 028	SIZE 034
(gpm)		Pressure	Drop (ft wg)
10	0.7	0.7	0.7	—
15	1.5	1.5	1.5	—
20	2.6	2.6	2.6	—
25	4.0	4.0	4.0	—
30	5.8	5.8	5.8	0.1
35	7.8	7.8	7.8	0.1
40	10.2	10.2	10.2	0.1
45	12.9	12.9	12.9	0.2
50	15.8	15.8	15.8	0.2
55	—	—	—	0.3
60	—	—	—	0.3
65	—	—	—	0.4

LEGEND

GPM — Flow Rate

PD — Pressure Drop (ft wg)

Table 6B — Hot Water Pressure Drop

50BVT,U,V,W,X Units

FLOW RATE	SIZE 034	SIZE 044	SIZE 054	SIZE 064
(gpm)		Pressure	Drop (ft wg)
45	2.4	—	—	—
50	3.0	—	—	—
55	3.6	—	—	—
60	4.3	—	—	—
65	5.0	—	—	—
70	5.7	—	—	—
75	6.6	—	—	—
80	7.4	—	—	—
85	8.4	—	—	—
90	9.3	2.5	2.5	2.5
100	—	3.1	3.1	3.1
110	—	3.7	3.7	3.7
120	—	4.4	4.4	4.4
130	—	5.1	5.1	5.1
140	—	5.9	5.9	5.9
150	—	6.7	6.7	6.7
160	—	7.6	7.6	7.6
170	—	8.6	8.6	8.6
180	—	9.6	9.6	9.6

LEGEND

GPM — Flow Rate

PD — Pressure Drop (ft wg)

Pipe sizes should be selected based on the head pressure available from the pump. Water velocity should not exceed 8 fps. Design the piping system for approximately 3 ft of loss per 100 equivalent ft of pipe. The piping system should allow for expansion and minimize vibration between the unit and piping system.

WATER ECONOMIZER (Optional) — The optional waterside economizer (pre-cooling coil) is factory-installed and piped inter- nally, in series with the condenser water circuit (Fig. 21). A divert- ing valve and factory controls are included with the option. Only one set of field connections needs to be made for condenser water and economizer water. In addition, when the unit is shipped with the economizer option, the economizer drain must be connected to a separate trap. Follow the same steps for the economizer drain as described for the evaporator condensate drain. An Aquastat is used to modulate water flow through the economizer. The control- ler is mounted to the low voltage control box. Electrical connec- tions are factory installed and wired. The remote bulb is shipped internal to the unit and requires field mounting. Care should be taken not to dent the bulb or miscalibration may occur. The Aquastat has a temperature range adjustment (–30 F to 100 F) and is field set. See Fig. 2-14 for connection locations and sizes. See Tables 7A and 7B for economizer waterside pressure drop data.

The waterside economizer can also be ordered without factory-installed piping or controls. This offers additional flexibility for specific applications. In this case, the coil is factory mounted, but all supply and return piping and controls are field supplied.

Table 7A — Economizer Pressure Drop Curve

(ft wg), 50BVC,E,J,K,Q Units

FLOW RATE	SIZE 020	SIZE 024	SIZE 028	SIZE 034
(gpm)		Pressure	Drop (ft wg)
35	8.9	—	—	—
40	11.5	11.0	—	—
45	14.4	13.8	—	—
50	17.6	16.9	16.9	—
55	21.1	20.4	20.4	—
60	24.9	24.1	24.1	3.5
65	29.0	28.1	28.2	4.1
70	34.4	32.5	32.5	4.7
75	—	37.1	37.2	5.4
80	—	42.1	42.1	6.1
85	—	—	47.4	6.9
90	—	—	52.9	7.7
95	—	—	58.7	8.5
100	—	—	64.9	9.4
105	—	—	—	10.3
110	—	—	—	11.3
115	—	—	—	12.3
120	—	—	—	13.4

LEGEND

GPM — Flow Rate

PD — Pressure Drop (ft wg)

3-WAY MOTORIZED

BALL VALVE a50-7269ef

WATERSIDE

ECONOMIZER

N.C.COIL

N.O.

AQUASTAT

MBV

N.O.

FLUID IN

“BULB STRAPPED TO FLUID” IN LINE (FIELD INSTALLED)

FLUID TO REFRIGERANT

HEAT EXCHANGER

POSITIVE SHUT-OFF SOLENOID VALVE FOR VARIABLE SPEED PUMPING SYSTEM

(FIELD INSTALLED)

Fig. 21 — Optional Water Economizer

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