Delta F-25 - Manual (Page 23)

Primary Piping
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 ELITE 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 Fig. 28 on
page 50 as a primary return connection. The
air elimination, 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 Fig. 8 through 11, pages 21 - 22, for
recommended piping arrangements based
on various applications. In all diagrams,
the space heating system is isolated from
the ELITE using primary / secondary pip-
ing connections.
Size the piping and system components
required in the space heating system using
recognized design methods.
System Piping - Zone Circulators
Connect the ELITE to the system piping as
shown in Fig. 9 page 21 when zoning with
zone circulators. The circulator supplied
with the ELITE 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.
19, page 35.
To ensure adequate flow rate through
the ELITE, maintain a minimum 1 inch
diameter on the system piping connect-
ing the unit to and from the primary /
secondary connection.
System Piping - Zone Valves
Connect the ELITE to the system piping as
shown in Fig. 9 page 21 when zoning with
zone valves. The primary / secondary pip-
ing ensures the priority is given to the pro-
duction of domestic hot water.
To control the system zone valve refer to
Fig. 18, page 34.
To ensure adequate flow rate through
the ELITE, maintain a minimum 1 inch
diameter on the system piping connect-
ing the unit to and from the primary /
secondary connection.
System Piping - Radiant Heating with Mixing
Valve
Connect the ELITE to the system piping as
shown with a radiant system using a thermo-
static mixing valve as shown in Fig. 11 page
22. The primary / secondary piping ensures
sufficient return temperature to the ELITE.
NOTICE
NOTICE
CAUTION
18