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Safety relief
valve
Circulator outputs,
Contact for Lamp
T-T connection
Air inlet thermistor
120VAC
• The NH199-DV / NH150-DV is a boiler to be
used for space heating or indirect water heating
only. Do not use the hot water supplied by the
boiler for drinking purposes.
• This boiler has a pressure rating of up to 150
psi, but it is designed to be used in a low pres-
sure (15 psi) closed loop heating system. Use a
30 psi safety relief valve.
• The required heating load should not exceed the
following ratings:
NH199-DV: 135,000 Btu or below
NH150-DV: 100,000 Btu or below
The above values include a 15% allowance to
provide for piping losses and pick up.
* The boiler will stop automatically if the load
surpasses these values greatly.
• When using anti-freeze, use Noritz approved anti-freeze only.
• The total flow rate of the heating circuit should be no less than 4 gpm (15 L/min.) and no greater
than 17 gpm (65 L/min.).
• The return temperature should be 80°F (25°C) or greater.
High limit switch
Heat exchanger
thermistor
Controller
SC
Controller
Transformer
Gas solenoid valve-2
Gas solenoid valve-1
frequency sensor
Gas solenoid valve-3
Water supply thermistor
Supply
Exhaust
Burner
Air supply
Fan motor
Rotational
Gas
Drain plug
0
3.8 7.6 11.4 15.2 19.0 22.8 26.6 30.4 34.2 38.0 41.8 45.6 49.4 53.2 57.0 60.8 64.6
Water return thermistor
Over heat prevention
device (Thermal fuse)
Igniter
Gas proportioning
Ignition plug
valve
Flame rod
Primary gas
valve
Water flow
switch
Water drain plug
Inlet filter
Return
NH199-DV, NH150-DV Friction loss
Flow rate (L/min)
Flow rate (GPM)
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