33
The Anti-Frost Protection Temperature setting
[AFST TEMP] controls the integrated Anti-frost
feature. Th default setting is 34°F, and is adjustable
up to 50˚F. The temperature of the primary coil is
constantly monitored. If the coil temperature drops
below the Anti-Frost Protection Temperature setting
the Anti-frost feature will be enabled, the fan will
continue run at the called for speed, but all HVAC
output will be disabled. The feature will be disabled
once the primary coil temperature rises 10°F above
this setting.For units that have firmware 1.6 or
greater (see section on "how to check firmware
level") The HVAC outputs will remain off once the
primary coil reaches 20° above setpoint AND a 2
minute time delay has expired. This will prevent
short cycling of the outdoor unit. The time delay and
degrees above setpoint are field adjustable. Please
refer to the menu tree in this manual.
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.The user will adjust the fan speed by
pressing "select" when the cursor is above the
"SP". Then the target Static Pressure ("SP")
can be adjusted up or down using the up and
down buttons. The fan will respond in real time
during the adjustment. Once the proper static
pressure has been established, the user must
press "select" to save the setting. If select is not
pressed, the unit will revert to it's previous set
point.
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.
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