Nature's Comfort NCB-80 Installation And Operating Manual - page 8
Page 8 of 34
E.
Controls & Plumbing Connections
The NCB boiler uses a hot water thermostat (aquastat) with a sensor that is inserted into a brass
drywell for sensing the water temperature of the unit. When the temperature falls below the
differential setting on the aquastat, the blower turns on and the damper actuator opens, feeding
oxygen to burn wood in the firebox, heating the water jacket and remaining on until the water
temperature in the boiler reaches the set point of the aquastat.
The temperature must be set for 165-180F with a differential of 15 degrees (white dial behind
aquastat cover) for optimum operation and performance and also provides for a long enough cycle
time to burn off any creosote that accumulates during idling. Never operate the boiler cooler than
150F as condensation will occur inside the firebox due to condensing from a greater temperature
difference (same principle as a glass of ice water sweating on the outside).
Boiler shown is set up as a single-zone. You
may install fittings to have ports for up to 4
zones
(Consult your dealer. Additional port setups with pumps
are also available from Nature’s Comfort when ordering a new unit.)
Single-Zone setup
1. Power from home feeds lower outlet.
2. Control power for pump, aquastat, solenoid,
blower and light is fed through main plug by
lower outlet.
3. Switch for shutting off power to aquastat
(which will shut down blower & solenoid).
4. Aqua-stat sensor for controlling blower and
solenoid. (set @ 165-180F w/15F differential)
5. Solenoid (behind cover) to lift intake cover off
blower.
6. Blower to feed oxygen to fire.
7. Damper to control air flow.
8. Pump to circulate water (pump not included.)
9. Red Pex pipe goes from the pump to heat
exchanger(s) in home.
Please note! Consult your
dealer for sizing as water flow is essential to the proper
& efficient operation of your installation.
10. Blue Pex pipe returns from home to upper
port. (Use of additional valve is
recommended for ease of servicing. Not
included.)
11. Extra Port (This is for a low water cut-off
switch if required by an inspector. Call your
dealer to obtain if needed)
12. Wires to outdoor light. (N/A if solar light was
included)