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Technical and Application Notes
Technical and Application Notes
Fan Operation
The thermostat may be factory configured for standard or
staged fan operation.
Standard Fan Operation
Table 16: Standard Fan Operation Overview
Menu
Fan is on continuously and is not dependant on
FAN ON
a heat or cool demand
Fan cycles on with a heat or cool temperature
FAN AUTO
demand and cycles off with the heat or cool
output
FAN SPEED
High, medium, or low is selected by the user
Single setpoint represented in
includes multiple setpoints.
Staged Fan Operation with Temperature Demand
Table 17: Staged Fan Operation with Temperature Demand
Overview
Menu
Fan stages from high to medium to low and
FAN ON
stays continuously on in the lowest available
speed
Fan stages from high to medium to low and
FAN AUTO
cycles off at set point
FAN SPEED
selected by the thermostat program
Single setpoint represented in
includes multiple setpoints.
Figure 9: Standard Fan Operation
Figure 10: Staged Fan Operation
12
Description
Figure
9. Programming mode
Description
Figure
10. Programming mode
Fancoil Operation
Fancoil operation is either a 2-pipe or 4-pipe configuration
which is determined by jumper selection JP4 (see
Mounting and Wiring the Thermostat‚ page
Pipe Sensor Operation
A pipe sensor can be connected when the thermostat is
configured for either 2-pipe or 4-pipe fan coil operation (see
JP4 jumper configuration). The Pipe sensor is used to
determine the water temperature in the Main Coil. The Pipe
Sensor should be mounted on the Main Coil supply and
wrapped with insulating material.
Pipe Sensor Input: 10K Remote Probe or a standard On-Off
Aqua-stat can be used for summer/winter changeover. ON
(closed) is winter heating mode and OFF (open) is summer
cooling mode.
Purge Cycle Operation
With a pipe sensor connected, this thermostat will initiate a
purge cycle if the sensed water temperature is ambiguous (not
adequately hot or cold). The purge cycle algorithm can be
either temperature or time based, depending on the
configuration of Service Menu 16.
Temperature-Based Purge
• When an Ambiguous mode is detected and a demand exists,
a 3 minute purge timer begins and the Main Output is
opened.
• After the 3 minute purge cycle, the thermostat checks again
to see if the water temperature is more than 15°F from set
point, or above 80°F or below 60°F.
• If Winter or Summer mode is determined, normal HVAC
operation occurs. If still ambiguous, the thermostat checks to
see if the COIL temperature is below 60°F or above 80°.
Coil < 60°F = Summer Mode.
Coil > 80°F = Winter mode.
• Purge Cycle is repeated until a non-ambiguous condition is
sensed.
Note: If at any time the demand goes away, the thermostat will
abort the purge cycle.
Installing,
4).
Daikin IM 1019
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