Primary Piping
15
-
Maximum set point for the limit is
186ºF.
-
For wiring of the limit reference Fig. 13,
page 26, using the external limit/manual
reset terminals on the 24V terminal strip.
This will provide a "hard" lockout
requiring a manual reset of the control.
Backflow Preventer
-
Use a backflow preventer valve in the
make-up water supply to the appliance
as required by local codes.
Primary System Piping Applications
It is recommended on all piping applica-
tions to utilize a primary/secondary pip-
ing arrangement as a means to provide
freeze protection of the appliance, which
is an integral function of the appliance
control and to utilize the full function of
the CH circulator while maintaining the
minimum flow rate, see Graph 1, page 56.
For other piping arrangements, consult
the Engineering Department at Triangle
Tube or consult other approved/recog-
nized design arrangements.
On piping applications utilizing a single
zone or other recognized piping design
arrangements, it is recommended the
installer uses flow/check valves with
weighted seats at or near the appliance to
prevent gravity circulation.
To prevent potential outer tank failure,
the primary system piping must be a
“closed” loop system to avoid any oxygen
contamination of the primary water.
Expansion Tank and Makeup Water
Ensure the expansion tank is properly sized
for the outer tank volume (approximately
20 gallons) and the system volume and
temperature.
Undersized expansion tanks will cause sys-
tem water to be lost through the pressure
relief valve and cause additional makeup
water to be added to the system. Eventual
primary tank failure can result due to this
excessive makeup water addition.
The expansion tank must be located as
shown in Fig. 7 through 10, pages 18
through 21 or as per recognized design
methods. Refer to the expansion tank man-
ufacturer instructions for additional instal-
lation 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.
For proper operation of the expansion tank
and system, remove the factory installed
automatic air vent from the MODULAT-
ING DELTA and plug the connection.
CAUTION
NOTICE
BEST PRACTICE
BEST PRACTICE
