Delta PG PLUS-25 - Manual (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