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HEATING BOILER SYSTEM PIPING:
Primary-Secondary Piping
For highest reliability and temperature accuracy, plumb
primary-secondary piping system (see figure 1.) By definition, a primary-secondary piping system uses separate circulating pumps
for each loop. This arrangement assures that flow through the building's heating loop will not cause flow through the boiler piping,
and that the boiler loop flows only when the boiler loop circulator is energized.
Remote Thermowell (for TempTrac sensor)
A single-probe thermowell ships with each
secondary loop upstream of the boiler's primary /secondary loop connection. A ¾-inch NPT female fitting with a depth clearance of
3 inches is required for installation. This factory-supplied single-probe thermowell (or optional four-probe well) is required for the
sensor to operate properly. Obtain good thermal contact between the sensing bulb and the well using heat conductive paste
designed for this purpose. The sensing bulb wire can extend approximately twenty feet. This wire can be spliced to extend up to
200 feet.
Replacement thermowell part numbers: 102560 (single-probe well) and 102561 (four-probe well).
IMPORTANT: Relocating the Operating Temperature Probe
®
PRIMERA
boilers and water heaters ship from the factory with the primary sensing probe (thermister) for the operating
temperature control installed in a thermowell in the inlet plumbing of the unit. The sensor must be located here initially to assist in
setting up the required temperature rise/flow rate for the appliance (see Water Velocity Control, page 18).
After the proper flow rate through each boiler/water heater is established, relocate the sensor to the remote thermowell.
The only exceptions to moving the primary sensing probe(s):
1.
Boiler applications where the primary circulator (pump controlling flow through the boiler) runs continuously. (not suggested
or recommended because of increased off cycle energy loss).
2.
Boiler applications where staging or modulation control for each PRIMERA
controller; where 2-stage burners are controlled by two separate energize/de-energize signals or where modulating
burners are controlled by a variable voltage or milliamp signal.
NOTE: If the multiple boiler controller provides only a single "on/off" signal to each boiler and the onboard TempTrac control
stages or modulates the burners, the probe must be relocated to the secondary loop as described above. If there is any
uncertainty about the control of the boilers, the installing contractor should provide a sufficient number of ¾-inch female NPT
fittings in the secondary loop as described above.
DOMESTIC WATER HEATER AND HOT WATER SUPPLY BOILER PIPING (Service Water Heating):
Important: Do Not install as an instantaneous heater. The unit must be piped to a storage tank (see figure 3).
®
PRIMERA
When Using
Do not use water piping, fittings, valves, pumps or other components which are not compatible with potable water.
Do not connect the heater to any heating system or components using non-potable water.
Do not add boiler treatment or any chemicals to the system piping.
Do not use solder containing lead in the potable water lines.
Remote Thermowell (for TempTrac sensor)
A single-probe thermowell ships with each
the storage tank. A ¾-inch NPT female fitting is required for installation. This factory-supplied single-probe thermowell (or optional
four-probe well) is required for the sensor to operate properly. Obtain good thermal contact between the sensing bulb and the well
using heat conductive paste designed for this purpose. The sensing bulb wire can extend approximately twenty feet. This wire can
be spliced to extend up to 200 feet.
Replacement thermowell part numbers: 102560 (single-probe well) and 102561 (four-probe well).
IMPORTANT: Relocating the Operating Temperature Probe
®
PRIMERA
boilers and water heaters ship from the factory with the primary sensing probe (thermister) for the operating
temperature control installed in a thermowell in the inlet plumbing of the unit. The sensor must be located here initially to assist in
setting up the required temperature rise/flow rate for the appliance (see Water Velocity Control, page 18).
After the proper flow rate through each boiler/water heater is established, relocate the sensor to the remote thermowell in
the storage tank. The only exception to moving the primary sensing probe(s) is a water heater application where the primary
circulator (pump controlling flow through the water heater) runs continuously. This method of operation is not suggested or
recommended.
PRIMERA
Water Heating Models In Potable Water Heating Systems:
PRIMERA
®
PRIMERA
boilers to the building's heating water circulating loop using a
®
boiler. For boiler applications, this thermowell must be located in the
®
heater. For water heating applications, this thermowell must be located in
23
®
is provided by a remote multiple boiler
34-50 04/02/2010
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