Product data

Catalog 724-2 13
Options and Accessories
Control Valve Options
Except for Shut-off Only packages, all valve and piping
packages include control valves for controlling water flow.
All Daikin control valves are factory assembled and mounted
in the supply water pipe downstream of the coil. Several
options are available:
Two-Way/Two-Position Valves
These valves will be either Fully-Open or Fully-Closed in
response to a line voltage (115, 208-230 or 265-277
VAC) or 24 VAC signal from the Daikin thermostat or
controller. Some means of relieving pump head pressure
should be applied when two-way valves are selected.
Normally-Open or Normally-Closed valves are available,
both spring-return type.
Three-Way Two-Position Valves
These valves either allow full water
ow through the coil or
divert the ow through a bypass line. The valves respond to
a line voltage (115, 203-230 or 265-277 VAC) or to 24 VAC
signal from the Daikin thermostat or controller. All standard
three-way valves come with a fixed-balance orifice in a
bypass line to compensate for flow balancing in the bypass
position, eliminating the need for an additional balancing
valve. Normally-Open or Normally-Closed valves are
available.
Two-Way Modulating Valves
These valves modulate the water flow through the coil in
response to a signal from the Daikin thermostat or controller.
Standard Daikin modulating valves are three-wire floating
point equal percentage valves. Zero to 10 VDC proportional
valves are also available. The modulating valves are factory
mounted in the supply water pipe upstream of the coil.
Three-Way Modulating Valves
These valves modulate water flow through a coil in response
to a signal from a Daikin thermostat or controller. Three-way
valves allow water that is directed through the coil to mix
with water that is directed through the bypass line. This
mixture exits through the leaving water pipe. Modulating
valves are three-wire, floating-point equal percentage valves
or 0-10 VDC proportional. The modulating valves are factory
mounted in the supply water pipe upstream of the coil.
Selecting Correct Size Modulating Valves
Daikin McQuayTools software automatically selects the best
modulating valve size for the unit and coil being considered.
By combining the ARI performance data, the coil ow
rate and the DP across the water coil, the water coil Cv is
calculated and the best matching modulating port size is
selected. Valve and piping packages can easily be congured
and automatically selected using Daikin McQuayTools.