Nature's Comfort NCB-120 Installation and operation instructions manual - page 12
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C. Plumbing Hook Up
1. Plumbing and electrical connections are made through the rear access door.
2. The water lines must be buried below the frost line to prevent freezing. The depth of the trench varies in
different regions of the country. Be completely sure about the correct depth needed before the insulated pex
pipe is installed underground. Contact your local building inspector’s office for this information.
4. If you purchased insulated pipe, it may contain twine for pulling electrical wire. Do this before the pipe is in the
trench for ease of pulling.
5. If more than one building is to be heated, additional pipe must be installed.
6. If you have rocky ground, make sure you place straw around the pipe before back filling, giving extra
protection against punctures.
7. Keep 90’s to a minimum as each one adds 1 foot of head pressure, reducing the rate of water flow. Use
sweeping bends and for tight radiuses, use ¾” rubber heater hose.
HINT:
If only one color of pipe is used, identify and label the water lines before back filling.
D. Electrical Lines
A qualified electrician must wire this boiler in accordance with the National Electrical Code.
Your Nature’s Comfort boiler requires installation of 1-15amp 110vac circuit to operate the equipment in the
boiler. The size and type of electric wire to be installed depends on the distance from the boiler to the house. If
the boiler is less then 100 feet from the house, #14 AWG UF cable is the smallest wire that may be used. If the
distance is greater than 100 feet, #12 AWG UF cable must be used. A maximum of 5 amps is used by the boiler if
all standard equipment is running or on and dual 100watt light bulbs are used.
E. Installation of Pex Pipe
Keep the pex pipe underground as it enters the house. Make sure to seal around the pipe to prevent water from
entering structure. This can be done with a can of expanding foam. If conditions require the pipe to be above
ground for entering the home, make sure to insulate thoroughly.
F. Filling Boiler with Water
Once all piping connections are complete, fill with 20 gallons of water and drain. Do this until water comes out
clean.
Do not start circulation pump until it has been primed!
Loosen the top screw on the pump until a
steady stream of water flows and all air has been purged.
Being a wet-rotor unit, if the pump runs dry at all, it will
seize up as the bearings rely on lubrication from the water.
Pour the Nature’s Comfort boiler treatment through the float stack then fill with water using a hose or if you have
installed a fill line, open the valve and allow it to fill until the float starts to rise. Use water that is softened or has