Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 45)

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APPENDIX B - WATER QUALITY, WATER TREATMENT AND FREEZE PROTECTION
WARNING
Install boiler so gas ignition system components are
protected from water (dripping, spraying, rain, etc)
during appliance operation and service (circulator
replacement, etc).
!
• DIELECTRIC ISOLATION
Two (2) 1-1/4” X 1-1/4” Female to female dielectric
isolation unions are shipped loose in boiler parts bag.
Install Dielectric Isolation unions at boiler supply line
and return line. Install isolation fittings nearest boiler
prior to system piping connections.
• WATER TREATMENT and ANTIFREEZE
PROTECTION
MUST be applied for ALL aluminum series high efficiency
gas-fired boilers using antifreeze protection.