Munchkin Gas-Fired Hot Water Circulating Heater Part 5 Munchkin Contender Piping, Circulators

GAS-FIRED HEATER Installation Manual

PART 5: MUNCHKIN CONTENDER PIPING (CONTINUED)

CAUTION

Undersized expansion tanks cause system water to be lost from relief valve and makeup water to be added through fill valve. Eventual failure can result due to excessive make-up water addition.

2.Expansion tank must be located as shown in Piping Part 5, 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.

Diaphragm (or bladder) expansion tank

1.Always install an automatic air vent on top of the air separator to remove residual air from the system.

F.CIRCULATORS

CAUTION

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 system, resulting in water- logging the expansion tank.

CAUTION

DO NOT use the heater circulator in any location other than the ones shown in this manual. The heater circulator is selected to ensure adequate flow through the Munchkin Contender. 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 manual Part 5. 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 HEATERS

The Munchkin Contender is designed to function in a closed loop 15 PSI System. A factory installed water pressure switch will ensure that you have adequate pressure in the system. The Munchkin Contender will not operate without a minimum of 10 PSI water pressure. This assures you that if the system does have leak, the Munchkin Contender will lock out (PRO on the display) before it damages the Stainless Steel Heat Exchanger. We have also included a Temperature and Pressure gauge which allows the user to monitor the system pressure and outlet temperature from the Munchkin Contender. It is important to note that the Munchkin Contender has a minimal amount of pressure drop and must be calculated when sizing the circulators. Each Munchkin Contender installation must have an Air Elimination device that will remove air from the system. Install the Munchkin Contender so the gas ignition system components are protected from water (dripping, spraying, etc.) allowing clearance for basic service of circulator replacement, valves and other. Observe minimum 1” clearance around all un-insulated hot water pipes when openings around pipes are not protected by non- combustible materials. On a Munchkin Contender installed above radiation level, some states and local codes require a low water cut off device at the time of installation (See Part C this section). If the Munchkin Contender supplies hot water to heating coils in air handler units, flow control valves or other devices must be installed to prevent gravity circulation of heater water in the coils during the cooling cycle. Chilled Water Medium must be piped in parallel with the heater. Freeze Protection for new or existing systems must use glycol that is specifically formulated for this purpose. It will include inhibitors that will prevent the glycol from attacking the metallic system components. Make certain that the system fluid is checked for the correct glycol

14