117
106375-01 - 4/16
Example Pump Parameter selections (continued):
XII. Operation
F. Changing Adjustable Parameters (continued)
Single Boiler with Supply Piped IWH, System and DHW Wired to Master
C
B
B
A
Flow Check
Optional
Full Port
Isolation
Valves
Heating
Circulators
Optional
Full Port
Isolation
Valves
To
System
Expansion Tank
Air Separator
& Air Vent
Close Nipple
(Locate Header Sensor
As Close As Possible
To Downstream Tee)
Hydraulic Separator
May Be Substituted
For Tees
Header Temperature
Sensor
(When Used)
Fill
Valve
Backflow
Preventer
Cold
Water
Line
Y-Strainer
(Recommended)
From
System
Full Port
Isolation
Valves
Indirect
Circulator
Relief Valve
Drain Valve
Secondary Unions Not
Required; Optional
Locations Shown
Full Port
Isolation
Valves
Flow Check
Indirect
Supply
Indirect
Return
Indirect Domestic
Water Heater
(IWH)
At least eight pipe diameters upstream of first tee.
A.
No further apart than 12" (~30 cm) or four pipe diameters, whichever is smaller.
B.
At least 18" (~46 cm) of straight pipe for Conventional Air Scoop.
C.
Boiler Circulator
To
System
Heating
System
Circulator
System
Zone
Valves
Optional Zone Valve
Controlled System
1
CAUTION:
It is the installers responsibility
to select boiler piping configurations that provide
the proper flow rates and performance for the boiler
and indirect water heater.
Parameter Selections:
System Pump = “Central Heat,
Optional Priority”
Boiler Pump = “any demand”
DHW Pump = “Primary Loop Piped IWH”
DHW Priority Enable is optional
Explanation:
When call for Domestic Hot Water is received
the DHW pump is turned on and the boiler
pump is turned on. This piping arrangement
permits the system pump to run or not run
when there is a domestic hot water call for
heat. Domestic hot water priority is optional.
It is permissible for the domestic and system
pumps to run at the same time. The boiler
pump must run for every call for heat.
