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2. FAN SETTINGS
The FAN SETTINGS menu consists of 3 sub menus: FAN
BALANCING, START TEMP, and FAN DELAY
2.1 FAN BALANCING: The FAN MODE setting will
determine the appearance of the FAN BALANCING
menu. If CONSTANT SPEED has been selected,
the SPEED% setting can be adjusted for each input.
For example: If FAN: CONSTANT SPEED has
been selected, then selecting “Y1: SPEED%”
will display:
The default speed value is 50%. Line 1 displays
the units, and line 2 shows the real time value of
the parameters. Selecting Y1% will set the
cursor at line 2 indicating real time adjustment is
active. UP and Down clicks will change Y1%
increasing the fan speed value up to 100% or
decreasing it down to 5%. The Pressure and
CFM values are constantly being updated to
provide feedback to the fan speed changes. You
must hit SEL to save the desired setpoint.
If CONSTANT PRESSURE has been selected
the static pressure setpoint can be adjusted for
each input.
For example: If FAN: CONSTANT PRESSURE
has been selected, selecting “Y1: ST PRESS”
will display:
The default pressure setpoint 1.2” WC. Line 1
shows the units. Line 2 shows the real time value
of the parameters. Selecting Y1 will set the
cursor to line 2, indicating real time adjustment is
active. UP and Down clicks will change the static
pressure setpoint, either increasing the value to
up to 2.5” WC or decreasing it down to 0.5”
WC. The fan speed will vary to maintain the
selected static pressure setpoint. You must hit
SEL to save the desired set-point.
2.2 FAN START TEMP: The temperature of the
heating/cooling coils is constantly being
monitored. When a call for heating or cooling is
received the fan will not start until the coil is at the
appropriate temperature. This assures the coil is
at the correct temperature to avoid initially
delivering warm air for a cooling call or cool air for
a heating call. The Fan Start Temperature
[START TEMP] menu allows the target coil
temperature to be adjusted. The default target
temperature for heating is 80°F and the default
target temperature for cooling is 70°F.
2.3 FAN DELAY: The FAN DELAY menu contains 2
settings: ON DELAY and OFF DELAY.
The FAN ON DELAY is only used if a coil sensor is
in fault. If the J+ board recognizes a coil temperature
sensor is not installed or has faulted the FAN ON
DELAY will be used to delay the fan from coming
on to allow the coil time to get to the target
temperature.
The FAN OFF DELAY is always used to allow the
fan to optionally run for a time after a demand has
been satisfied allowing time to offload the coil of
any excess heat that may still be present.
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