Dunkirk Q90-200 Series II - Manual (Page 11)

11
NOTE: When zoning with
circulators, use furnished circulator
pump as one of zone pumps. Tape
or wire nut each stripped end of
electrical wire for circulator pump
inside junction box to prevent short
circuits. Unplug circulator pump
wiring at integrated boiler control.
Supply And Return Lines
Packaged boiler receives 1¼” NPT supply and return piping
from top access.
Figure 6 - Multi-zone Boiler Piping with Circulators
4 - NEAR BOILER PIPING
Figure 7 Multi Zone Boiler Piping With Zone Valves
SUPPLY TO
ZONE SERVICE
FLOW CHECK
VALVE
VALVE
RETURN FROM
ZONE SERVICE
ZONE SERVICE
VALVE
ZONES
ZONES
VALVE
VALVE
FLOW CHECK
ZONE SERVICE
VALVE
CIRCULATORS
AIR SCOOP
EXPANSION TANK
REDUCED PRESSURE
BACKFLOW PREVENTER
GATE VALVE
FEED
WATER
PRESSURE
REDUCING VALVE
CAN VENT
DIELETRIC UNION
CIRCULATOR
SUPPLY TO
ZONE SERVICE
VALVE
ZONE SERVICE
RETURN FROM
ZONE SERVICE
VALVE
VALVE
ZONES
VALVE
ZONE VALVE
ZONE SERVICE
ZONES
EXPANSION TANK
AIR SCOOP
REDUCED PRESSURE
BACKFLOW PREVENTER
PRESSURE
REDUCING VALVE
FEED
WATER
GATE VALVE
PURGE VALVE
SHUT OFF VALVE
CAN VENT
DIELETRIC UNION
DIELECTRIC UNIONS
DIELECTRIC UNIONS