Delta PG PLUS-25 warranty Domestic Piping Section IV Domestic Piping

Domestic Piping
SECTION IV - Domestic Piping
	CAUTION
General Piping Requirements
	The Temperature / Pressure relief valve
• All plumbing must meet or exceed all	is not intended for constant duty, such as
local, state and national plumbing codes.	relief of pressure due to normal thermal
• Use pipe dope or tape suitable for	expansion.
potable water.	Water Hammer
• Use isolation valves to isolate system
components.	Water hammer is the effect of sudden pres-
• Install unions for easy removal of the	sure changes occurring in the domestic pip-
	ing. These pressure changes are typically
PERFORMANCE PLUS from the sys-
	the result of “fast acting” positive shut-off
tem piping.
	valves closing. These types of valves can
Domestic Supply Pressure	be typically found on dishwashers and
	clothes washers.
For applications in which the domestic sup-	The effects of water hammering can cause
ply pressure exceeds 70 psig it is recom-	damage to system components and tank
mended to install a pressure reducing valve	welds on the unit.
on the cold water supply.	Installation of hammer arresters is recom-
Maintaining the cold water supply at or
	mended at these types of appliances, which
below 70 psig will prevent normal thermal	incorporate “fast-acting” positive shut-off
expansion from repeatedly forcing the T&P	valves. Consult the manufacturer of water
relief valve open.	hammer arresters for recommendation on
	sizing and installation requirements.

Thermal Expansion

If the cold water supply contains a backflow preventer, check valve and / or a pressure reducing valve, the installer must install a domestic thermal expansion tank on the cold water supply. (See Fig. 6 page 17)

Installing a thermal expansion tank will prevent normal thermal expansion from repeatedly forcing the T&P relief valve open.

When installing a thermal expansion tank ensure the charge pressure of the tank is equal to the cold water supply pressure at the point of installation. Consult the ther- mal expansion tank manufacturer’s instruc- tions for further information on installation and sizing.

Temperature / Pressure Relief Valve

The PERFORMANCE PLUS has a factory installed Temperature / Pressure Relief valve. Ensure the rating of the T&P relief valve is correctly sized as follows per AGA:

Model	AGA Rating
PG PLUS-25	100,000 Btu/hr
PG PLUS-30	200,000 Btu/hr
PG PLUS-35	200,000 Btu/hr
PG PLUS-40	200,000 Btu/hr
PG PLUS-45	200,000 Btu/hr

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