Page 36
FIGURE 17
MOTORIZED
DAMPER ASSEMBLY
MANUAL OUTDOOR AIR
DAMPER − PAINTED SIDE
B7
DAMPER
MOTOR
OUTDOOR AIR DAMPER
D−Supply and Return Diffusers (all units)
Optional flush mount diffuser/return FD9−65 and ex-
tended mount diffuser/return RTD9−65 available for use
with all KHA units. Refer to manufacturer’s instructions
included with transition for detailed installation proce-
dures.
E−Economizer
(Field or Factory Installed)
Unit may contain an optional field or factory−installed econ-
omizer equipped with an A6 enthalpy control and an A7
outdoor enthalpy sensor. The modulating economizer
opens fully to use outdoor air for free cooling when temper-
ature is suitable and opens to minimum position during the
occupied time period.
The A6 enthalpy control is located in the economizer ac-
cess area. See figure 18. The A7 enthalpy sensor is located
on the division panel between horizontal supply and return
air sections.
FIGURE 18
ECONOMIZER CONTROLS
A6
ENTHALPY
CONTROL
B7
DAMPER
MOTOR
A7
ENTHALPY
SENSOR (OTHER
SIDE OF PANEL)
POWER EXHAUST WIRES
ONLY CONNECTED WHEN
UNIT IS EQUIPPED WITH
POWER EXHAUST
MIXED AIR SENSOR
(R1) AND WIRING IN
THIS BUNDLE
Optional Sensors
An optional differential sensor (A62) may be used with the
A7 outdoor sensor to compare outdoor air enthalpy to re-
turn air enthalpy. When the outdoor air enthalpy is below
the return air temperature, outdoor air is used for free cool-
ing.
Mixed air sensor (R1) is used to modulate dampers to 55
°
F
(13
°
C) discharge air.
An optional IAQ sensor (A63) may be used to lower operat-
ing costs by controlling outdoor air based on CO
2
level or
room occupancy (also called demand control ventilation or
DCV). Damper minimum position can be set lower than
traditional minimum air requirements; dampers open to
traditional ventilation requirements when CO
2
level reach-
es DCV (IAQ) setpoint.
Refer to instructions provided with sensors for installation.
A6 Enthalpy Control LED’s
A steady green Free Cool LED indicates that outdoor air is
suitable for free cooling.
When an optional IAQ sensor is installed, a steady green
DCV LED indicates that the IAQ reading is higher than set-
point requiring more fresh air. See figure 19.
Summary of Contents for KHA SERIES
Page 41: ...Page 41 KHA036 048 060 Y Voltage 1 2 5 9 3 11 6 7 8 4 4 5 5 8 9 9 10...
Page 42: ...Page 42 KHA036 048 060 G J Voltage 1 2 5 9 3 11 6 7 8 4 4 5 5 7 9 9 10 11...
Page 46: ...Page 46 T1EH 7 5 10 15 22 5 kW P VOLTAGE 1 3 4 5 6 7 2 4 4 4 7 7 7...
Page 47: ...Page 47 T1EHA 7 5 15 22 5kW Y VOLTAGE KHA SERIES UNITS 1 3 4 5 6 7 2 4 7...
Page 48: ...Page 48 T1EHA 7 5 15 22 5kW G J VOLTAGE KHA SERIES UNITS 1 3 4 5 6 7 2 4 7...
