www.DaikinApplied.com 57
IM 830-6
Making Control Connections
Controls by Others Components
Daikin
unit ventilators come with factory installed components
and wiring. It facilitates the field hookup of controls by others,
capable of providing the standard ASHRAE II cycle that
are compatible with these factory installed and pre-wired
components.
CAUTION
!
It is the responsibility of the Automatic Temperature Control
supplier to check that the controls operates correctly and
protect the unit.
Controls by others option consists of the following components
which are factory provided and wired where indicated:
1. Unit Main Power "On-Off" switch:
disconnects main
power to the unit. Non-fused power interrupt switch (S1)
2.
Fuse(s):
fan motor, auto transformer and control
transformer have the hot line(s) protected by factory
installed fuse(s).
3. Three (3) speed HIGH-MEDIUM-LOW-OFF motor fan
speed switch (SW2):
wired to auto transformer (X1), to
provide fan speed/air delivery.
4. Factory installed Low Air Temperature (limit T6 -
freezestat):
across leaving air side of hydronic heating
coil. Cuts out below 38°F ± 2°F and automatically resets
above 45°F ± 2°F. Responds when any 15% of the
capillary length senses these temperatures.
CAUTION
!
It is the responsibility of the Automatic Temperature Control supplier to
check that the T6 freezestat is incorporated properly to protect the unit.
5. Low Refrigerant Temperature Sensor (T4 - capillary
sensor):
for direct expansion (DE) coils the unit is
supplied with a T4-capillary sensor located on the leaving
air side of the direct expansion coil. T4 cuts out below
34°F ± 2°F and automatically resets above 38°F ± 2°F.
Responds when any 15% of the capillary length senses
these temperatures.
6. 40 VA, 24 volt, NEC class 2 transformer
: for Direct
Expansion (DE) coils the unit is supplied with a for 24 volt
power (X2), with a factory installed 5 minute timer delay
relay (TDR) (located inside Unit Power Box).
CAUTION
!
It is the responsibility of the Automatic Temperature Control supplier
to check that T4 and R4 are incorporated properly to protect the unit.
Figure 96: Controls by Others Unit Component Locations
Bottom View
Left End View
Right End View