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GAS-FIRED BOILER Boiler Manual
PART 5: BOILER PIPING
(CONTINUED)
J. ZONING WITH ZONE VALVES
1. Connect boiler to system as shown in 2A and
2B in Piping Details when zoning with zone
valves. The primary/secondary piping shown
ensures the boiler loop will have sufficient
flow. It also avoids applying the high head of
the boiler circulator to the zone valves.
2. Connect DHW (domestic hot water) piping to
indirect storage water heater as shown.
K. ZONING WITH CIRCULATORS
1. Connect boiler to system when circulator
zoning as shown in 1C and 1D in Piping
Details when zoning with circulators. The
boiler circulator cannot be used for a zone. It
must supply only the boiler loop.
2. Install a separate circulator for each zone.
3. Connect DHW (domestic hot water) piping to
indirect storage water heater as shown.
L. MULTIPLE BOILERS
1. Connect multiple boilers as shown in 1E and
1F in Piping Details.
2. All piping shown is reverse return to assure
balanced flow through the connected boilers.
3. Each connected boiler must have its own
circulator pump to assure adequate flow.
4. Connect DHW (domestic hot water) piping to
indirect storage water heater as shown.
CAUTION
It is highly recommended that you carefully
follow the glycol manufacturer’s recommended
concentrations, expansion requirements and
maintenance recommendations (pH additive
breakdown, inhibitor reduction, etc.). You must
carefully figure the additional friction loss in the
system as well as the reduction in heat transfer
co-efficients.