Raypak 5042004 operating instructions Piping, Air-Separation/Expansion Tank, Gpm

	Model	Input	Output	20° ∆T		30° ∆T		40° ∆T		Min. Flow			Max. Flow
	No.
		MBTUH		gpm	∆P	gpm	∆P	gpm	∆P	gpm	∆P	∆T	gpm	∆P	∆T
	504	500	420	42	2.7	28	1.4			25	1.1	34	100	11.3	8
	754	750	630	63	6.0	42	2.9	32	1.7	32	1.7	40	100	13.8	13
	1104	1100	924	92	13.3	62	6.7	46	4.1	46	4.1	40	113	18.6	16
	1504	1500	1260			84	13.3	63	8.0	63	8.0	40	113	22.2	22
	2004	1999	1679			112	26.9	84	16.0	84	16.0	40	113	27.2	30
	Note: Basis	for minimum flow is		∆T. Basis	for maximum flow is gpm.
Piping				Table F: Heater Rates of Flow and Pressure Drops

All high points should be vented. A heater installed above radiation level must be provided with a low wa- ter cut-off device (sales order option F-10). This heater, when used in connection with a refrigeration system, must be installed so that the chilled medium is piped in parallel with the heater with appropriate valves to pre-vent the chilled medium from entering the heater.

The piping system of a hot water heater connected to heating coils located in air handling units where they may be exposed to circulating refrigerated air, must be equipped with flow control valves or other automatic means to prevent gravity circulation of the heater water during the cooling cycle. It is highly recommend- ed that the piping be insulated.

Air-Separation/Expansion Tank

All heaters should be equipped with a properly sized expansion tank and air separator fitting as shown in Fig. 11.

THERMOSTAT OR

SYSTEM SENSOR

*Maximum 4 times the pipe diameter or 12”, whichever is less.

Fig. 12: Single Heater - Low-Temperature (Heat Pump)

Application with Primary/Secondary Piping

THERMOSTAT OR

SYSTEM SENSOR

Fig. 11: Air-Separation/Expansion Tank		*Maximum 4 times the pipe diameter or 12”, whichever is less.
		Fig. 13: Dual Heaters (Reverse/Return)
	15	with Primary/Secondary Piping