Primary Piping, System Piping Zone Circulators

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)

CAUTION

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.

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.

NOTICE

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 water.

To control the system circulator refer to Fig. 33, page 44.

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.