50
Aluminum Series

High Effi ciency Gas-Fired Boiler

DIELECTRIC ISOLATION & ANTIFREEZE PR OTE CTION

ADDENDUM

APPENDIX A - WATER QUALITY, WATER TREATMENT AND FREEZE PROTECTION
WARNING
Follow these instructions to prevent damage to
boiler’s heat exchanger caused by inadequate
dielectric isolation, incorrect water treatment or
antifreeze application. Failure to comply could result
in death or serious injury.
!
• Install boiler so gas ignition system components are
protected from water (dripping, spraying, rain, etc)
during appliance operation and service (circulator re-
placement, 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 fi ttings nearest boiler
prior to system piping connections.
• WATER TREATMENT and ANTIFREEZE
PROTECTION
MUST be applied for ALL aluminum series high
effi ciency gas-fi red boilers using antifreeze
protection.