Q3 & Qht Controls for Chilled Water Systems Description of the Controls
L-2962 ENGLISH 3
Figure 2: Qht Diagram - Control Display Panel and Indicators
Table 2: Qht Diagram Description of Control Display Panel and Indicators
1 Data Display - Large LCD readout displays current temperature,
set point, programmed values and error messages.
9 Fan Mode Indicator - The word MANUAL displays when the fan is
running in Manual Fan Mode. The word MANUAL does not display
when the fan is running in Automatic Fan Mode.
2 Set Point Indicator - Display shows SET when set point is being
adjusted. Normally display defaults to inside temperature.
10 Dehumidify Mode Indicator - The word DEHUMIDIFY displays
when you are in Dehumidification Mode. It flashes if optional
humidity sensor is connected and operating in the Cooling Mode.
(Press the MODE button to select Dehumidification Mode.)
3 Aux Heating Indicator and Aux Heat Mode Indicator (optional) -
A solid dot displays next to the words AUX HEAT when the electric
heater is on and running in Aux Heat mode. The words AUX HEAT
display when you are in Aux Heat mode. (Press the MODE button
to select the optional Aux Heat Mode.) See Programmable Function
“12: Aux Heat Enabled/Disabled” on page 9.
11 FAN Button - Press to select Manual or Automatic Fan Mode,
indicated by the word MANUAL displaying or not displaying. In
Manual Fan Mode, additional presses of the FAN button will adjust
fan speed higher, then lower, then back to Automatic. In Automatic
Fan Mode, fan speed is controlled by the system as a function of
the difference between set point and inside temperature. See
Programmable Function “3: Fan Response Differential” on page 8.
4 Heating Indicator - A solid dot displays next to the word HEAT
when the bypass valve is on (open) and running in Heat mode.
12 UP Button - Press to adjust set point up. In programming mode
press to scroll through program modes and adjust values.
5 Cooling Indicator - A solid dot displays next to the word COOL
when the bypass valve is on (open) and running in Cool mode.
13 DOWN Button - Press to adjust set point down. In programming
mode press to scroll through program modes and adjust values.
6 Run Mode Indicator - Lights when the Run mode is selected. The
Run mode will automatically switch from cool to heat depending on
set point, cabin temperature, and entering loop-water temperature.
(Press the MODE button to select Run mode.)
14 MODE Button - Press to cycle through the modes of operation
(refer to indicators). Mode sequence selections are RUN, AUX
HEAT (optional), AUTO (RUN with optional AUX HEAT), and
DEHUMIDIFY.
7 AUTO Mode Indicator - A bracket and the word AUTO display to
the right of the words COOL, HEAT, and AUX HEAT when you are
in Auto Mode. Auto Mode automatically switches from RUN mode
to AUX HEAT depending on set point, cabin temperature, and
entering loop-water temperature. AUTO Mode can only be selected
if the optional Aux Heat function is enabled (see Programmable
Function “12: Aux Heat Enabled/Disabled” on page 9).
15 POWER Button - Press to turn the system on and off. Note that
the Data Display remains on in the Off mode. You can continue to
adjust set point, display temperature readings and activate the
manual fan to circulate air while the system is in the Off Mode.
8 Fan Speed Indicator - A row of five bars indicate the current fan
speed, with more bars indicating a higher fan speed and fewer bars
indicating a lower fan speed.
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