Viconics VT7606E Installation Manual - Manual (Page 26)

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| PIR Ready VT7600 Series-Installation Guide
028-0363-02
C mech
Mechanical cooling
allowed
Default value =
Off
In Cooling mode.
Allows the operation of the mechanical cooling if the
free cooling ( economizer ) cannot maintain the cooling
setpoint.
Off Typically applies when the MS ( mixed air tempera-
ture sensor ) is installed after the mechanical cooling
refrigeration coils. In this case, mechanical cooling will
never operate at the same time as free cooling.
On Typically applies when the MS ( mixed air tempera-
ture sensor ) is installed before the mechanical cooling
refrigeration coils in the mixing plenum. In this case,
mechanical cooling is allowed when the free cooling
( economizer operation ) cannot maintain the cooling
setpoint.
Off or On
mix stpt
Mixed air setpoint
Default value =
55 °F
(13.0 °C)
Free cooling mixed air setpoint when economizer mode
is enabled.
50 to 90 °F (10.0 to 32.0 °C)
SH lock
Only valid if HT Type is
set to Analog
Outside air temperature
supply heat lockout
Default value =
32 °F
(0 °C)
Disables heating operation based on outdoor air tem-
perature.
From –15 °F up to 120 °F (-26 °C up to 49 °C)
(increments: 5° or 50°)
Dis HL
Discharge air
temperature high limit
Default: 120°
Discharge air high temperature value at which the heat-
ing stages will be locked out.
70°F to 150°F (21°C to 65°C)
(increments: 0.5° or 5°)
Dis LL
Discharge air
temperature low limit
Default: 45°F
Discharge air low temperature value at which the cooling
stages will be locked out.
35 to 65°F (2.0°C to 19.0°C)
(increments: 0.5° or 5°)