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It also exposes the Chiller Array Screen via M/S button.
Access: Main Menu>Devices Menu>M/S:
• The left side of this screen provides the parameters for
Primary/Secondary units.
• The right side of this screen provides status
information, that details which nodes are requested to
run by Primary and their actual running capacity.
Hot Gas Bypass Valves Control
Note: Not available on Thermafit™ TACW.
HMI HGV Control option should be changed to Enabled in
order to expose Hot Gas Valve control screen under
Devices Menu.
Figure 42. HMI HGV control enabled screen
Controls accessed on main Hot Gas Bypass valve screen
and Setup pop-up screen are common for all Hot Gas
Bypass Valves. Controls available on HGVs / Solenoids
pop-ups, however are individual for each Hot Gas Bypass
Valve.
1. Hot Gas Bypass Valve Control
a. Displays trend and current values for Setpoint,
Process Value and Valve position.
b. PV. Chiller LWT.
c. SP. SP = Chiller SP – low urgency zone (refer to
Chiller Control Manual) + SP Offset (described
below).
d. T3C dP. Evaporator inlet / outlet pressure delta.
e. Trend has y-axis zoom capability.
f. Access: Main Menu > Devices Menu > HGV
button.
g. Provides access to other pop-up screens:
• Setup
• HGVs
• Solenoids
2. Hot Gas Bypass Valve Setup
a. SP Offset. Involved in setpoint calculation (see
main screen SP description above).
b. P-Gain and I PID constants.
c. Max and Min valve position settings.
d. Access: Main Menu > Devices Menu > HGV
button > Setup button.
3. Hot Gas Bypass Valves manual control
a. Each Hot Gas Bypass valve can be in one of the
following modes:
• Auto. Valve controlled automatically by Hot
Gas Bypass PID controller;
• Off. Valve is always off;
• Manual. Valve position is set up manually.
b. Access: Main Menu > Devices Menu > HGV
button > HGVs button.
4. Hot Gas Bypass solenoids manual control
Operating Procedures
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