Zoning With Zone Valves; Zoning With Circulators; Multiple Boilers - Westinghouse WBCETNG750 Manual

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5. A 50% mixture of glycol will result in a BTU output loss of 30%
with a 50% increase in head against the system circulator.
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.). Carefully figure
the additional friction loss in the system as well as the reduction
in heat transfer coefficients.
L. Zoning with Zone Valves
1. When zoning with zone valves, connect the boiler to the
system as shown in Applications. 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 in Applications.
M. Zoning with Circulators
1. When using circulator zoning, connect the boiler to the system
as shown in Applications. NOTE: The boiler circulator cannot be
used for a zone. It must only supply 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 in Applications.
N. Multiple Boilers
1. Connect multiple boilers as shown in Applications.
2. All piping shown is reverse return to assure balanced flow
throughout 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 in Applications.
5. The system flow (secondary loop) must be greater than the
boiler's primary loop flow.
WHL-038 Rev. 1.29.16