Product data

Catalog 724-2 35
Engineering Guide Specication
mounted magnetic contactor shall be supplied
on all voltages. High temperature cutouts with
automatic reset and one with manual reset must
be provided as an integral part that de-energizes
the electric heat in the event of an overheat
condition.
1.01 VALVE PACKAGES
A. Fan coil units shall be provided with factory-
installed valve / piping package(s)available for the
primary [and secondary]coil. All piping packages
shall be factory assembled and tested at 400 psig
(2760 kPa) and re-tested for leak when factory
soldered to the coil(s) at 300 psig (2069 kPa)
Maximum Working Pressure of the piping package
shall be 300 psig (2069 kPa).
B. The valve package shall be designed so that any
condensation is directed into the secondary drain
pan. With the secondary drain pan provided,
insulation of the piping package is not required.
C. The valve package shall be provided with:
1. Interconnecting copper piping and shut-off ball
valves.
2. Connecting supply and return lines to the unit.
[Four-pipe packages shall include a venting
valve for the preheat or reheat coil].
3. {A manual circuit setter in the supply water
pipe. The circuit setter acts as both a ow-
setting device and a shut-off valve. It allows
water ow through the fan coil to be set quickly
and accurately. The valve shall have a memory
stop so that the correct setting can be found
quick ly}.
4. {An automatic circuit setter. The circuit setter
includes a cartridge within the valve body that
is sized to allow a specic ow rate through
the coil. This valve sets ow through the coil
without any action required by a system piping
balancer.}
5. P/T ports to measure the temperature or pressure
drop across the valve. This pressure drop can be
compshall bed to factory-supplied curves that
relate the pressure drop to a specic ow rate.
6. Unions at the coil connections.
7. {A 20 mesh strainer on the supply side that is
easily removed for cleaning, with a blow-off
valve. The strainer shall have a pressure rating
of up to 400 psig (2,758 kPa)}
8. {Isolating ball valve on the supply side}
9. {Balancing ow valve ( auto-xed or manual)
with isolating ball valve on the return.}
10. Control valves in the supply water pipe.
a. Two-Way/Two-Position Valves that shall be
fully open or fully closed in response to a
line voltage (115VAC) (265-277 VAC)
(24 VAC signal) from the
Daikinthermostat
or controller. Some means of relieving pump
head pressure should be accounted for when
two-way valves shall be selected. Normally-
open or normally-closed valves shall be
available as per schedule.
b. [Three-Way, Two-Position Valves that
either allow full water
ow through the
coil or divert the ow through a bypass
line. The valves respond to a line voltage
(115VAC) (265-277 VAC) (24 VAC signal)
from the Daikin thermostat or controller. All
standard three-way valves come with
a xed-balance orice in the bypass line
to compensate for ow balancing in the
bypass position, eliminating the need for an
additional balancing valve. Normally-open or
normally-closed valves shall be available as
per schedule.]
c. [Two-Way Modulating Valves that modulate
the water flow through the coil in response to
a signal from the Daikin thermostat or
controller. All standard Daikin modulating
v
alves shall be three-wire floating point equal
percentage valves. The modulating valves
shall be factory mounted in the supply water
pipe upstream of the coil.]
d. [Three-Way Modulating Valves that
modulate the water flow through the coil
in response to a signal from the 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. All modulating valves
shall be three-wire, floating-point equal
percentage valves.]
1.02 FILTERS
A. Filters shall be 1" (25 mm) throwaway. They shall
be concealed from sight and easily removable.