Raypak Boiler 42 66 User Guide

RESIDENTIALS  
Inputs from  
42,000  
thru  
180,000  
BTUH  
Firing Mode  
Models 42 & 66 – Single-stage firing  
Models 90-180 – 2-stage firing  
Radiant Heating  
Hydronic Space Heating  
• Snow Melting  
Non-Condensing  
Operates at 105 °F return water temperature  
without condensing – perfect for the low-  
temperature needs of radiant floor and snow  
melting systems  
Built-In Pump and Bypass  
Offers maximum application flexibility  
Honeywell IID Ignition  
Standard S8600 IID eliminates off-cycle fuel  
consumption; Standing pilot available on Models  
90-180  
Spark-To-Hood” Pilot  
Eliminates erratic pilot ignition and lockout  
Motorized Vent Damper  
Prevents heat loss during off-cycles  
Non-Ferrous Waterways Option  
All bronze pump and fittings and glass-lined  
headers eliminate boiler oxygen permeation  
problems associated with non-barrier radiant  
tubing  
Outstanding Warranty  
One-year parts and service warranty against  
defects  
 

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