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The outside boiler has a hot water thermostat (aquastat) with a thermocouple that is inserted into a brass drywell that
senses the water temperature of the unit. When the temperature of water in the boiler falls below the “low”
temperature setting on the aquastat, the blower turns on to build a hotter fire and remains on until the water
temperature in the boiler reaches the “high” temperature setting of the aquastat. Temperature may be set anywhere
between 160 – 180 degrees. When heating your home through a radiant system, the recommended setting is 180.
When heating with a forced air system, the recommended setting is 170. The aquastat also has a temperature swing
setting that is adjustable from 5 – 30 degrees. Recommended setting is 15 degrees which provides for longer run
times to burn off creosote buildup.
J. Pex Pipe Connections
Boiler shown is set up as a single-zone. All boilers save
for the NCB-120 come with ports for 2 hookups (2
nd
Pump not included.)
Single-Zone setup
1.
Red Pex pipe goes from the pump to
heat exchanger(s) in home.
Please
note! The pump that came with your
boiler may not be the correct size for
your installation. Please consult your
dealer for sizing as water flow is
essential to the proper & efficient
operation of your installation.
2.
Blue Pex pipe returns from home to
lower port opposite of pump.
Please
note! This is critical for proper circulation
inside the water jacket. If installed on
the lower left, hot spots will occur on the
right side of the water jacket causing
boiling and loss of water due to steam.
3.
Power to pump, aquastat, solenoid and
blower.
4.
Blower to feed oxygen to fire.
5.
Pump to circulate water. (One is
included.)
6.
Aqua-stat sensor for turning on blower
and solenoid.
7.
Solenoid with adjustable damper. (After
adjusting damper, make
sure to tighten
jam nut.)
Note:
Water flows out at top and in at bottom. (See
arrows #1 and #2.)
Temperature gauge shown was optional on
older models.
Summary of Contents for NCB-120
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