Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller manual Circulator Sizing

PIPING

8.Install an Air Elimination Device on the system supply.

9.Install a drain valve at the lowest point of the system. Note: The Munchkin can not be drained completely of water without purging the unit with an air pressure 15 PSI.

10.The Safety Relief Valve is installed at the factory located on the right hand side of Munchkin. Pipe the discharge of safety relief valve to prevent injury in the event of pressure relief. Pipe the discharge to a drain. Provide piping that is the same size as the safety relief valve outlet. Never block the outlet of safety relief valve.

11.In compliance with ASME CSD-1, a low water cut-off device should be properly connected in the field, both electrically and mechanically.

See the piping illustrations included in this section, Figs. 5-3 to 5-11 for suggested guidelines in piping the Munchkin heater with either zone valves or circulator pumps.

*Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

B. CIRCULATOR SIZING

The Munchkin Heat Exchanger does have pressure drop which must be considered in your system design. Refer to the graph below for pressure drop through the Munchkin Heat Exchanger.

	20
	19
	18
	17
	16
Head	15
	14
	13
of	12
	11
Feet
	10
in	9
	8
Friction
	5
	7
	6
	4
	3
	2
	1
	0
	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21
							Flow in Gallons per Minute
				MUNCHKIN T50M									MUNCHKIN T80M/80M
				MUNCHKIN 140M									MUNCHKIN 199M
Figure 5-1									BOILER				TACO P/N			GRUNDFOS P/N
								T50M/T80M/80M					007 * UPS15-58 FC SPD 2
										140M			0010 *				26-64 F
										199M			0011 *				26-96 F

* THE RECOMMENDED CIRCULATORS ARE BASED ON 1 GPM PER 10,000 BTU/HR W/20

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