GSW 319594-000 manual VII Combo Heating, System Requirements, Installation

VII) COMBO HEATING

This section serves as a guide for the installation and use of "Combo" heating systems utilizing a domestic water heater that has been specifically approved for such use. It is writ- ten for those knowledgeable in the required trades and pro- fessionals involved in the design and installation of Combo Heating Systems.

It is the responsibility of the installer/designer to follow all applicable codes to ensure the effectiveness and safety of the installation.

2.Install a drain valve at the lowest point of the heating loop so that water can be drained from the heating mod- ule without affecting the water heater.

3.If the air handler does not have a venting means at the highest point of the piping arrangement, install an air bleed at the highest point of the plumbing arrangement.

System Requirements

The following requirements must be met for the installation
					EXPANSION TANK						CHECK VALVE
of Combo Heating Systems:										COLD
											(IF USED
						(OPTIONAL)
1.	All components used for the distribution of water in the									SUPPLY	REQUIRES
	heating loop must be suitable for potable water. These			HOT WATER							EXPANSION
							MIXING				TANK)
	include all piping, fittings, solder and fluxes, pumps for			TO HOUSE
				FIXTURE			VALVE
	circulation of water, valves, etc.
2.	The water heater must not be connected to a hydronic				8in TO 12in		M	H
	heating system that has been used previously.
3.	No boiler treatment chemicals of any kind shall be intro-				MAX.			C
		CHECK
	duced into the system.
		VALVE			H O T						COLD
4.	The Combo System components must be selected and
		EXTERNAL			OUTLET						INLET
	sized to meet and maintain the total calculated				FLOW
		CIRCULATOR
	demands for both domestic service hot water and space
					CONTROL
	heating requirement. The sizing and installation must be	HOSE	BIB
	performed in accordance with good engineering prac-	(OPTIONAL)
	tice such as "ASHRAE Handbooks", HRAI,				SUPPLY					WATER
			RETURN						HEATER
	"Hydronics Institute Manuals", CSA B149.1, NFPA
	54, ANSI Z223.1, CSA F280, National/Provincial	DRAIN/PURGE
	Building Codes, CSA C22.1, ANSI/NFPA 70, CSA	VALVE
	B51 and/or codes having jurisdiction.	I N T E R N A L
5.	The air handler (fan coil) and/or the circulating pump in	CIRCULATOR
		AIR HANDLER
	a baseboard hydronic loop will require a dedicated
	120V circuit. This must be provided and identified for	Figure 29 Combo Heating - Air Handler
	this purpose.
6.	All piping between the water heater and the air handler
					EXPANSION TANK					COLD	CHECK VALVE
	or hydronic baseboard loop must be adequately insulat-					(OPTIONAL)					(IF USED
										SUPPLY	REQUIRES
	ed to reduce heat loss.
				HOT WATER							EXPANSION
7.	If the local jurisdiction requires a back-flow preventer in										TANK)
				TO HOUSE			MIXING
	the cold water line, an expansion tank of adequate size			FIXTURE			VALVE
	must be installed.
8.	"Combo" Heating Systems require higher water temper-							C
					8in TO 12in		M
	atures than other applications. When the system is				MAX.			H
	used to supply water for Combo Heating applications, a	CHECK
	means, such as mixing valve, must be installed to tem-	VALVE			H O T						COLD
	per the water in order to reduce scald hazard potential	EXTERNAL			OUTLET						INLET
					FLOW
	(see Figures 29 & 30).	CIRCULATOR
					CONTROL
Installation		HOSE	BIB
		(OPTIONAL)		SUPPLY
The heating mode may be one of the following options:
			RETURN							WATER
A.	A fan coil/air handler (Figure 29).								HEATER
B.	A hydronic baseboard (finned tube) loop/In floor heating	HYDRONIC
	(Figure 30).
		BASEBOARDS
The following is a list of requirements for the installation of		(SERIES CON-
the heating loop to the water heater.		NECTED
		SHOWN)

1.Install shut-off valves and unions so that the water heater can be isolated from the heating module should

servicing of the water heater become necessary.	– 31	Figure 30 Combo Heating - Baseboard
		–