HTP ELP-199 - Manual (Page 27)

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LP-294 REV. 2.20.14
Upon completion, make sure that the fill valve and zone valves are in automatic positions. You must also assure the purge and shut off
valves are in open positions.
L. GLYCOL ANTIFREEZE SOLUTIONS
Use only inhibited propylene glycol solutions which are specially formulated for hydronic systems. Ethylene glycol is toxic and can
attack gaskets and seals used in hydronic systems. Glycol mixtures should not exceed 50%.

Glycol in hydronic applications should include inhibitors that prevent the glycol from attacking metallic system components.
Make certain that the 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 solution expands 4.8% in volume for a
temperature increase from 32
o
F to 180
o
F, while water expands 3% over the same temperature rise. Allowances must be made
in system design for expansion.

A 30% mixture of glycol will result in a BTU output loss of 15% with a 5% increase in head against the system circulator.

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.) You must carefully calculate the additional friction
loss in the system as well as the reduction in heat transfer coefficients.
M. ZONING WITH ZONE VALVES
1. When zoning with zone valves, connect the boiler to the system as shown in Piping Details, Part 4, Section G. 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 zone valves.
2. Connect DHW (domestic hot water) piping to indirect storage water heater as shown in Piping Details.
N. ZONING WITH CIRCULATORS
1. When using circulator zoning, connect the boiler to the system as shown in Piping Details, Part 4.
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 Piping Details.
O. MULTIPLE BOILERS
1. Connect multiple boilers as shown in Piping Details, Part 4.
2. All piping shown is reverse return to assure balanced flow throughout connected boilers.
3. Each connected boiler must have its own circulator pump to assure adequate flow.
4. Ensure a swing check valve is installed on each boiler return pipe.
5. Connect DHW (domestic hot water) piping to indirect storage water heater as shown in Piping Details.
6
. The system flow (secondary loop) must be greater than the boiler’s primary loop flow.
PART 5 – VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL
The boiler must be vented as detailed in this Venting Section. Ensure exhaust and intake piping complies with these instructions
regarding vent system. Inspect exhaust vent and intake piping thoroughly to ensure all joints are well secured, airtight, and comply with
all applicable code requirements, as well as with the instructions provided in this manual. Failure to properly install the vent system will
result in property damage, severe personal injury, or death.