Figure 51
#IRCULATORZONINGWITHHIGHANDLOWTEMPERATURE
HEATINGZONES
Part number 550-100-305/0916
41
AquaBalance
TM
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
— C
OMBI
Boiler Manual
17
Primary/Secondary System Piping
(continued)
Circulator zoning – Multiple
temperature zones with
primary/
secondary
See Figure 51
.
1. This configuration is for circulator-zoned systems with
high- and low- temperature
heating zones
using a
boiler loop connected as a secondary circuit off of a pri-
mary system loop. Systems zoned with circulators must
pipe the boiler loop as a secondary circuit as shown.
2. Install a separate circulator (supplied by installer) for
each zone capable of delivering the proper flow and
head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guide-
lines on pages 36 or 37.
2.
DO NOT
use a closed-type tank if connecting to a boiler
that is equipped with an automatic vent.
System setup and settings
1. Hi-temp emitters may be baseboards, radiators, fan
coils, or heat exchangers.
For cast iron radiation and old black iron pip-
ing systems a “Dirt separator with a magnet”
must be installed on the return piping to
protect the boiler heat exchanger.
2. Add a mixing device (Figure 51, item 24) to help ensure
supply water temperature will not exceed the maximum
allowable for the radiant system.
3. Heating zone supply water temperature settings should
be selected for the hi-temp zones. The mixing device
regulates supply temperature to the lower-temp zones.
Boiler operation for fan coil only applica-
tions, parameter P02
may be set to 20 for
faster “ramp up” to boiler set point tem-
perature.
Controlling the Zones
1.
The control can be used to control space heating only,
domestic water heating only, or both.
2. The boiler and circulators can also be operated by
a zone controller and in some installations may be
needed.
