Munchkin Gas-Fired Hot Water Boiler Specifiche Scaricare il pdf (Pagina 20)

LP-185 Rev. 3.2.15

 Install in a tee on the supply piping above the boiler.

 Follow low water cutoff manufacturer’s instructions.

D. 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. (See piping details at the end of this section.)

All piping methods shown in this manual use primary/secondary connection to the boiler loop. This is to avoid the possibility of noise or

actuator problems in zone valves because of the high-head boiler circulator. For other piping methods, consult your local HTP

representative or refer to separate piping details in this manual.

E. SYSTEM WATER PIPING METHODS

EXPANSION TANK AND MAKE-UP WATER

1. Ensure expansion tank size will handle boiler and system water volume and temperature. Allow 3 gallons for the boiler and its piping;

4 gallons for 399 models and piping.

Expansion tanks must be sized according to total system volume. This includes all length of pipe, all fixtures, appliances, etc. Failure to

properly size system expansion could result in wasted time, money, and possible property damage, personal injury, or death.

Undersized expansion tanks cause system water to be lost from relief valve and make-up water to be added through fill valve. Eventual

failure can result due to excessive make-up water addition. SUCH FAILURE IS NOT COVERED BY WARRANTY.

2. Expansion tank must be located as shown in Piping diagrams, or following recognized design methods. See 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 its air cushion. An automatic air vent would cause air to leave the system, resulting in water-logging 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.

F. CIRCULATORS

DO NOT use the boiler circulator in any location other than the ones shown in this manual. The boiler circulator is selected to ensure

adequate flow through the boiler. Failure to comply could result in unreliable performance and nuisance shut downs from insufficient

flow.

SIZING SPACE HEAT SYSTEM PIPING

1. See Piping Details in this section. In all diagrams, the space heating system is isolated from the heating loop by the

primary/secondary connection.

2. Size the piping and components in the space heating system using recognized design methods.

G. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE BOILERS

This boiler may function in a closed loop 15 psi system. A factory installed water pressure switch ensures adequate pressure in the

system. The boiler will not operate without a minimum of 10 psi water pressure. This assures you that if the system does have a leak,

the boiler will lock out (PRO on the display) before it damages the heat exchanger.

The included temperature and pressure gauge allows the user to monitor the 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. Each

installation must also have an air elimination device that will remove air from the system.

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Munchkin Gas-Fired Hot Water Boiler Specifiche Pagina 20