Page 232 - HVAC Pump Handbook

Rishel_CH08.qxd 21/4/06 6:16 PM Page 229

The Use of Water in HVAC Systems

The Use of Water in HVAC Systems 229

3–1000 GPM @ 72 ft. Circulator 10–200 GPM coil
variable speed pumps 200 GPM @ 14' 2' Piping
25 HP motors 1–1/2 HP motor 2' Pump fitting
Balance valve: 2 ft.
10' Coil
16' Pump head
Ten
coils

Coil Coil

Chiller ∆P
loop
bypass Balance DP set at
vlave 14 ft.

b. Secondary chilled water system with coil circulators.
From variable
primary 2000 GPM
pumping at 76 ft. head

Chiller
Ten
minimum coils
flow valve
Coil
Chiller ∆P
bypass
∆P set at
26 ft.

To variable primary Two-way control
pumps valves
c. Contempory system with two-way control valves.
Figure 8.6 (Continued.)

the recommended system now for contemporary two-way coil valve
projects. Also, the remote differential transmitter shown in these fig-
ures for pump speed control is described in Chap. 10.
Energy consumption in HVAC water systems is very dependent on
the proper use of water in these systems. The following coil connec-
tions impinge heavily on energy consumption in hot and chilled water
systems. The great variation in energy use will be demonstrated for

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