HELIX VX-050 Installation, Operation & Maintenance Manual page 81

User Interface Display
Allowed Range: 1 to 60 Minutes
Default Setting: 30 Minutes
APPENDIX A - CONTROL MODULE
Maximum time boiler operates in DHW mode limited by DHW
Maximum Priority Time Setting.
Priority timer starts when both CH and DHW demand is present.
Boiler will switch from DHW back to CH operation after Maximum
Priority Time has elapsed.
CH demand then has priority until Maximum Priority Time has
elapsed.
Process repeats until either CH or DHW demand satisfied.
System test can be activated via installer menu for testing
system at fixed power rates.
Boiler can be started without CH or DHW demand being present.
System Test has priority over any system demand while test
mode activated.
System test mode automatically ends after 30 minutes boiler
resumes normal operation.
The following modes are available:
• Disabled
• Low power - Burner starts. After ignition period has
• Ignition power - Burner starts. Stays at ignition power
• High power - Burner starts. After ignition period has
Note:
• Before running system test modes, check if hydronic
system capable of dissipating heat.
• Both heat exchanger and CH pumps are activated during
system test.
• During System Test Mode, boiler will run at fixed power
rates until supply water temperature is 93°C/195°F
• All other safety functions remain active while in System
Test Mode.
81
Explanation
finished the burner stays at low power
finished burner stays at high power.