Bradford White UCG100H399, Service Manual

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Spec i f i cat i ons
P o w er S u pp l y D ed ic ated 120 VA C , 6 0 H z, 1 5A G FI
Gas Supp l y
Minimum 1 ” N at
( Schedu l e 4 0 b l ack iron pipe recommended )
Approved gas T ype N atura l. Unit must match gas type supp l ied
Gas Pressure (N at .)
1 4. 0 ” W . C . ma x imum static , 4. 5 ” W . C . minimum running
( recommend 7 . 0 ” W . C . min running )
Venting System
Atmospherica ll y Vented , T ype B Venting system or
approved chimney . F o ll ow the current N ationa l F ue l
Gas Code requirements or in Canada , the N atura l Gas
and Propane I nsta ll ation Code .
Minimum C l earance for
Servicing
18 ” from top , 2 4” from front , 4” sides and rear .
Ma x imum Water Supp l y
Pressure
150 PS I
T hermostat Sensor
11 , 900 Ohms @ 70 °F, E CO opens @ 207 °F Ma x.
Redundant sensor for E CO . Sensor inside we ll for easy
rep l acement of sensor .
Contro l Disp l ay
Digita l disp l ay , 2 4 vo l ts . temperature Range: 70 - 180
degree F. Used to set tank temperature ( deg . F or deg .
C ), show operating status , disp l ay error codes , error
code history , l imit ma x imum setpoint temperature .
Contro l Board
Operates from 2 4 vo l t from transformer . Contro l s tank
temperature , ignition functions , combustion b l ower . See
ignition timings in sequence of operation for I ntegrated
Contro l.
T ransformer 120 VAC primary , 2 4 VAC secondary , 4 0 VA .
Spark Rod I gniter 0 . 22 ” nomina l gap to the burner surface .
Fl ame Sensor Output
Minimum 1 micro amp . T ypica l range 5 to 30 micro
amps .
Gas Va l ve
N egative regu l ation , 2 4 VAC , ½ ” PS I ma x., 4. 5 ” W . C .
minimum running in l et .
Vent Safety Switch N orma ll y c l osed , opens @ 2 4 0 °F, manua l reset .
B l ower 120 VAC , 60 H z, 1 . 5 - 3 . 5 amps , 8000 RPM
Combustion Leve l s CO
2
: 8 - 11 %, CO: l ess than 0 . 0 4% (4 00 PPM ) air free
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