HTP ELP-199 - Manual (Page 17)

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LP-294 REV. 2.20.14
C. BACKFLOW PREVENTER
Use a backflow preventer specifically designed for hydronic boiler installations. This valve should be installed on the cold water fill
supply line per local codes (Part 4, Section G. Piping Details).
All piping methods shown in this manual use primary/secondary connection to the boiler loop. This is to avoid the possibility of
inadequate flow through the boiler. For other piping methods, consult your local HTP representative or refer to the detailed piping
drawings in this manual.
D. SYSTEM WATER PIPING METHODS
EXPANSION TANK AND MAKE-UP WATER
1. Ensure the expansion tank is sized to correctly handle boiler and system water volume and temperature.
Expansion tanks must be sized according to total system volume. This includes all length of pipe, all fixtures, boilers, etc. Failure to
properly size system expansion could result in wasted time, money, and possible property damage, personal injury, or death.
ADDED VOLUME TO SYSTEM BY ELITE PLUS BOILER
ELP-110 1.7 Gallons
ELP-199 2.6 Gallons
Table 4
Undersized expansion tanks cause system water to be lost from the relief valve and make-up water to be added. Eventual boiler failure
can result due to excessive make-up water addition. SUCH FAILURE IS NOT COVERED BY WARRANTY.
2. The expansion tank must be located as shown in Part 4, Boiler Piping, or following recognized design methods. See expansion tank
manufacturer’s instructions for details.
3. Connect the expansion tank to the air separator only if the separator is on the suction side of the circulator. Always install the system
fill connection at the same point as the expansion tank connection to the system.
4. Most chilled water systems are piped using a closed type expansion tank.
DO NOT install automatic air vents on closed type expansion tank systems. Air must remain in the system and return to the tank to
provide an air cushion. An automatic air vent would cause air to leave the system, resulting in improper operation of the expansion tank.
DIAPHRAGM (OR BLADDER) EXPANSION TANK
Always install an automatic air vent on top of the air separator to remove residual air from the system.
E. CIRCULATORS
DO NOT use the boiler circulator in any location other than the ones shown in this manual. The boiler circulator location is selected to
ensure adequate flow through the boiler. Failure to comply with this caution could result in unreliable performance and nuisance
shutdowns from insufficient flow.
Sizing Space Heat System Piping
1. See Piping Details in this manual, Section G. In all diagrams, the space heating system is isolated from the boiler loop by the
primary/secondary connection.
2. Size the piping and components in the space heating system using recognized design methods.
F. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE BOILERS
This boiler is designed to function in a closed loop hydronic system. We have included a temperature and pressure gauge that allows
the user to monitor system pressure and outlet temperature from the boiler. It is important to note that the boiler has a minimal amount
of pressure drop that must be calculated when sizing the circulators. Unless the system has a closed type expansion tank, each boiler
installation must have an air elimination device that will remove air from the system.