Delta PG PLUS-25 Operations Instructions download pdf (Page 26)

20

Primary Piping

SECTION V - Primary Piping

General Piping Requirements

Low Water Cutoff Device

- The PERFORMANCE PLUS is equipped

with a factory installed pressure switch

style Low Water Cut Off device.

- The minimum operating system pressure

allowable with this device is 10 psig.

- Check local codes which require a low

water cutoff device for compliance of

this device.

Backflow Preventer

- Use a backflow preventer valve in the

make-up water supply to the unit as

required by local codes.

Primary System Piping Applications

All piping applications shown in this instal-

lation manual utilize a primary/ secondary

piping arrangement. This method is re c -

ommended as a means to provide priority

to the production of domestic hot water.

F o r o t h e r piping arrangements, consult the

Engineering Department at Triangle Tu b e

o r consult other a p p r o v e d / re c o g n i z e d

design arrangements.

On piping applications utilizing a single

zone or o t h e r recognized piping design

arrangements it is recommended the

i n s t a l l e r uses flow/check valves with

weighted seats at or n e a r the appliance to

p r event gravity circ u l a t i o n .

To prevent potential outer tank failures the

p r i m a r y system piping must be a “closed”

loop system to avoid any oxygen contami-

nation of the boiler w a t e r.

Expansion Tank and Makeup Water

Ensure the expansion tank is properly sized

for the outer tank volume (20 gallons) and

the system volume and temperature.

Undersized expansion tanks will cause sys-

tem water to be lost through the pre s s u r e

relief valve and cause additional makeup

w a t e r to be added to the system. Eventual

p r i m a r y tank failure can result due to this

excessive makeup water a d d i t i o n .

The expansion tank must be located as

shown in Figure 11, 11A or 11B page 23 or

as per recognized design methods. Refer to

the expansion tank manufacturer instruc-

tions for additional installation details.

Connect the expansion tank to an air sepa-

rator only if the air separator is located on

the suction side (inlet) of the system circu-

lator. Always locate and install the system

fill connection at the same location as the

expansion tank connection to the system.

Diaphragm (Bladder) Expansion Tank

Always install an automatic air vent on the

top of the air separator to remove residual

air from the system.

Closed-Type (Standard) Expansion Tank

It is recommended to pitch any horizontal

piping toward the expansion tank 1 inch per

5 feet of piping. Use 3/4” piping for the

expansion tank to allow air within the sys-

tem to rise.

CAUTION

NOTICE

BEST PRACTICE

BEST PRACTICE

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