Delta PG PLUS-25 Operations Instructions download pdf (Page 20)

Domestic Piping

SECTION IV - Domestic Piping

General Piping Requirements

• All plumbing must meet or exceed all

local, state and national plumbing codes.

• Use pipe dope or tape suitable for

potable water.

• Use isolation valves to isolate system

components.

• Install unions for easy removal of the

PERFORMANCE PLUS from the sys-

tem piping.

Domestic Supply Pressure

For applications in which the domestic sup-

ply pressure exceeds 70 psig it is recom-

mended to install a pressure reducing valve

on the cold water supply.

Maintaining the cold water supply at or

below 70 psig will prevent normal thermal

expansion from repeatedly forcing the T&P

relief valve open.

Thermal Expansion

If the cold water supply contains a backflow

p r e v e n t e r, 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.

The Temperature / Pressure relief valve

is not intended for constant duty, such as

relief of pressure due to normal thermal

expansion.

Water Hammer

Water hammer is the effect of sudden pres-

sure changes occurring in the domestic pip-

ing. These pressure changes are typically

the result of “fast acting” positive shut-off

valves closing. These types of valves can

be typically found on dishwashers and

clothes washers.

The effects of water hammering can cause

damage to system components and tank

welds on the unit.

Installation of hammer arresters is recom-

mended at these types of appliances, which

incorporate “fast-acting” positive shut-off

valves. Consult the manufacturer of water

hammer arresters for recommendation on

sizing and installation requirements.

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:

CAUTION

14

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

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 75 76

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