21
LP- 325 REV. 3.3.15
For installation that incorporates standing iron radiation and systems with manual vents at high points, follow above section and,
starting with the nearest manual air vent, open until water flows out. Then close vent. Repeat procedure, working your way toward
furthest air vent.
NOTE:
It may be necessary to install a basket strainer in an older system where larger amounts of sediment may be present. Annual
cleaning of strainer may be necessary.
Upon completion, make sure that the fill valve is in automatic position and each zone balance and purge or shut off is in an open
position and zone valves are set for automatic operation.
Use only inhibited propylene glycol solutions which are
FDA RATED AS
GRAS
and specifically formulated for hydronic systems.
Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.
Glycol in hydronic applications includes inhibitors that prevent it from attacking metallic system components. Make certain that system
fluid is checked for the correct glycol concentration and inhibitor level.
The glycol solution should be tested at least once a year, or as recommended by the glycol manufacturer.
Anti-freeze solutions expand more than water. For example: A 50% by volume glycol solution expands 4.8% in volume during a
temperature increase from 32
o
F to 180
o
F, while water expands 3% over the same temperature rise. Allowances must be made for
expansion in system design.
A 30% mixture of glycol results in a BTU output loss of 15% with a 5% increase in head against the system circulator.
A 50% glycol mixture results 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 glycol manufacturer recommended concentrations, expansion requirements, and
maintenance recommendations (pH additive break down, inhibitor reduction, etc.) You must carefully figure the additional friction loss in
the system as well as the reduction in heat transfer coefficients.
I. ZONING WITH ZONE VALVES
1. Connect appliance to system as shown in the Piping Details diagrams. Properly size circulators for friction loss of zone valves and
piping for proper operation.
2. Connect DHW (domestic hot water) piping to indirect storage water appliance as shown.
J. ZONING WITH CIRCULATORS
1. Connect appliance to system as shown in the Piping Details diagrams. Properly size each zone circulator for friction loss of each
zone for proper operation.
2. Install a separate circulator for each zone.
3. Connect DHW piping to indirect storage water appliance as shown.
K. MULTIPLE APPLIANCES
1. All piping shown is reverse return to assure balanced flow through the connected appliances.
2. Connect DHW piping to indirect storage water appliance as shown.
Содержание Pioneer
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