Sequence Of Operation - Daikin OptiLine FSG Installation, Operation And Maintenance Manual

Sequence of Operation

2-Pipe Heating/Cooling Units
The control valve is activated by the cool and heat outputs from
the thermostat which are connected to an aquastat. On a call
for cooling from the thermostat and the water temperature is
less than 65ºF, the aquastat energizes the control valve. If the
water temperature rises above 85ºF, the aquastat de-energizes
the control valve. On a call for heating from the thermostat
and the water temperature is greater than 85ºF, the aquastat
energizes the control valve. If the water temperature drops
below 65ºF, the aquastat de-energizes the control valve.
The aquastat has black, yellow and orange wire leads. The
switch closes for heating at 85ºF +/- 5F through BLK and ORG
and cooling at 65ºF +/- 5ºF through BLK and YEL.
2-Pipe Heating/Cooling Auxiliary Electric
Heat Unit
The control valve and electric heat relay are activated by the
cool and heat outputs of the thermostat which are connected to
two aquastats labled A1 and A-2 on the wiring diagram. On a
call for cooling from the thermostat and the water temperature
is less than 65ºF, the A1 aquastat energizes the control
valve. If the water temperature rises above 85ºF, the aquastat
deenergizes the control valve. On a call for heating from the
thermostat and the water temperature is more than 100ºF, the
A2 aquastat energizes the control valve. If the water drops
below 75ºF, the aquastat de-energizes the control valve and
energizes the electric heat relay.
The A2 aquatat has black, yellow and orange wire leads. The
switch closes for heating at 100ºF +/- 5ºF through BL and
ORA and cooling at 75ºF +/- 5ºF through BL and YEL. The A1
aquastat has 2 brown wire leads. The switch closes for heating
at 85ºF +/- 5ºF and cooling at 65ºF +/- 5ºF.
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2-Pipe Heating/Cooling Total Electric
Heat Unit
The control valve and electric heat relay are activated by the
cool and heat outputs of the thermostat. No aquastats are
used. On a call for cooling from the thermostat, the thermostat
energizes the chilled water control valve. On a call for heating
from the thermostat, the thermostat heat output energizes the
electric heat relay. The control valve remains closed.
4-Pipe Heating/Cooling Unit
The hot water control valve and chilled water control valve are
activated by the cool and heat outputs of the thermostat. No
aquastats are used. On a call for cooling from the thermostat,
the thermostat cool output energizes the chilled water control
valve. On a call for heating from the thermostat, the thermostat
heat output energizes the heating water control valve
NOTE: Always refer to wiring diagram on the motor cover
panel to the determine the model and type of fan coil.
This can be viewed by lifting the hinged filter access
panel door.
See submittal for more information specific to the unit
and refer to the wiring diagram on the motor cover.
Figure 3: Hinged Filter Access Panel Door
9 IM 1272 • OPTILINE VERTICAL FAN COILS
Operating Instructions