HELIX VX-050, Installation, Operation & Maintenance Manual, Page: 80 / 88

80
User Interface Display
Explanation
CH Settings
Outdoor reset boost function increases CH set point by
increment (‘Temp’) if CH demand continues beyond pre-set
time limit (‘Time’).
CH set point will continue to increase until set point reaches
195°F / 91°C
Allowable Temperature Increment: 0..36 °F (0..20 °C)
Default Temperature increment: 0 °F (10 °C)
Allowable Time Delay: 1..120 minutes
Default Time Delay: 20 minutes
Maximum boiler power in CH mode limited by adjusting
‘Maximum Power CH’ setting. Boiler will not exceed this
value while operating in CH Mode.
Allowable Range: 1..100%
Default Setting: 100%
DHW Sett
ings
Two DHW modes are available
• DHW Mode = 0 ‘No DHW
• DHW Mode is disabled
• The DHW thermostat input is ignored and the DHW
pump is not used.
• DHW Mode = 2 ‘DHW Store with Thermostat’
• Boiler reacts to DHW demand when DHW thermostat
input closes.
• Boiler modulates to meet DHW demand similar to CH
Mode except DHW set point is used. DHW set point set
in Settings’ submenu found in 'User Menu’.
• Simultaneous CH & DHW demands handled using DHW
Priority Timing. See ‘DHW Maximum Priority Time’
setting below.
Note:
• Outdoor reset function disabled while operating in DHW
Mode.
• Typical when using a DHW indirect storage tank.
• After DHW demand satisfied, boiler enters post purge
mode and DHW pump continues to run for 15 seconds.
APPENDIX A - CONTROL MODULE