Delta PG PLUS-25 Operations Instructions download pdf (Page 27)

21

Primary Piping

For proper operation of the expansion tank

and system, remove the factory installed

automatic air vent from the PERFOR-

MANCE PLUS and plug the connection.

(See Item 10, Fig. 46 page 68)

DO NOT install automatic air vents on a

closed-type expansion tank system. Air

must remain in the system and be

returned to the expansion tank to pro-

vide an air cushion. An automatic air

vent would cause air to be vented from

the system resulting in a water-logged

expansion tank.

Circulator

The PERFORMANCE PLUS is supplied

with a circulator that is pre-wired to allow

for domestic priority. Locate the circulator

in the return or supply piping as shown in

the piping diagrams included in this manual.

Closet (Zero Clearance) Applications

For applications in closets or zero clear-

ances, the installer may use the upper prima-

ry connection shown as Item 4 on page 70 as

a primary return connection. The air elimi-

nation, expansion tank and make-up water

system should then be piped directly into the

primary loop of the space heating prior to

the system circulator.

Sizing Primary Piping

See Figure 12 through 15, pages 24 - 25,

for recommended piping arrangements

based on various applications. In all dia-

grams, the space heating system is isolated

from the PERFORMANCE PLUS using

primary / secondary piping connections.

Size the piping and system components

required in the space heating system using

recognized design methods.

System Piping - Zone Circulators

Connect the PERFORMANCE PLUS to

the system piping as shown in Fig. 12 page

24 when zoning with zone circulators. The

circulator supplied with the PERFOR-

MANCE PLUS should not be used for a

heat zone. It must supply only the prima-

ry loop.

Install a separate circulator for each zone of

space heating.

To control the zone circulators refer to Fig.

34, page 45.

To ensure adequate flow rate through

the PERFORMANCE PLUS, maintain a

minimum 1 inch diameter on the system

piping connecting the unit to and from

the primary / secondary connection.

System Piping - Zone Valves

Connect the PERFORMANCE PLUS to the

system piping as shown in Fig. 13 page 24

when zoning with zone valves. The prima-

ry / secondary piping ensures the priority is

given to the production of domestic hot

w a t e r.

To control the system circulator refer to

Fig. 33, page 44.

To ensure adequate flow rate through

the PERFORMANCE PLUS, maintain a

minimum 1 inch diameter on the system

piping connecting the unit to and from

the primary / secondary connection.

NOTICE

NOTICE

CAUTION

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