Introduction - HELIX VX-399 Installation, Operation & Maintanance Manual

1.1 Designated Use
• Hot water heating boiler.
• Indoor installation.
• Closet or alcove installation.
• Direct vent or single vent pipe boiler.
• For use with natural gas or liquefied petroleum gases
(LP/propane).
1.2 The unit MUST NOT:
• Directly heat potable water. Indirect heating is acceptable.
• Heat water with non-hydronic heating system chemicals
present (example, swimming pool water).
• Exceed 150 psig (1.03 MPa) maximum allowable
working pressure.
• Exceed 195°F (90.5°C) system design temperature.
1.3 Operational Features
• Modulating: 20-100%.
• Integral Dual Temperature Limit.
• CSD-1 Compliant - listing based on manufacturer's
interpretation of CSD-1 requirements. Consult authority
having jurisdiction prior to installation.
X Manual reset low water cutoff
X Manual reset high temperature limit
• Outdoor Temperature Reset Available.
• Heat exchanger over heat protection.
• Alternate mounting of User Interface Available
Check our website frequently for updates: www.ecrinternational.com
Information and specifications outlined in this manual in effect at the
time of printing of this manual. ECR International, Inc. reserves the right to
discontinue, change specifications or system design at any time without
notice and without incurring any obligation, whatsoever.

1 - INTRODUCTION

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P/N 240010943, Rev. C [09/07/2016]