Hot Surface Ignition System - Bradford White EF100T150(E)*(N Service Manual

Power supply Dedicated 120 VAC, 60 Hz, 15A, GFI
Minimum 1" NPT for EF100T399, all others ¾" NPT
Gas Supply
(schedule 40 black iron pipe recommended)
Approved Gas Type Natural or Propane. Unit must match gas type supplied.
Gas Pressure ( ) 14.0" W.C. maximum static, 4.5" W.C. minimum running (recommend 7.0" W.C. min running)
Nat & L.P.
Venting System Power vent, balanced direct vent or unbalanced direct vent. See vent tables on page 7
Approved Vent Materials PVC or CPVC
Minimum Clearance
18" from top, 24" from front, 4" sides and rear.
for Servicing
Maximum Water Supply
150 PSI
Pressure
Thermostat Sensor 11,900 Ohms @ 70°F, ECO opens @ 201°F Max., ECO close @ 100°F Min.
Temperature Dial Min. set point 5400-6600 ohms, Max set point 0-50 ohms.
Thermostat Board Max temp 180°F, Min temp 91°F, 24VAC, 60Hz max.
Ignition Module See "Sequence of Operation, for models starting with CF serial and later"
Transformer 120VAC primary, 24VAC secondary, 40VA.
Hot Surface Igniter 120VAC, 30-120 ohms @ room temperature.
Flame Sensor Output Minimum 1 micro amp, Typical range 4 to 7 micro amps.
Gas Valve Negative regulation, 24 VAC, ½" PSI max., 4.5" W.C. Minimum running inlet.
Vent Safety Switch Normally closed, opens @ 350°F, manual reset.
Intake Pressure Switch
"CF" serial number or Not required.
later
Intake Pressure Switch
serial numbers prior to 24VAC, normally closed, opens on vacuum increase @ -1.20 W.C.
"CF"
Blocked Vent Pressure
Switch "CF" serial 24VAC, normally closed, opens when pressure increases to +2.70 W.C.
number or later
24VAC, normally open, closes on pressure increase as follows
Note 1:
Exhaust pressure switch
serial numbers prior to
"CF"
Note 2: +5.6" W.C. on serials prior to AH5039107
Note 3: +0.8" W.C. on serials prior to AK5288269
Blower 120VAC, 60Hz, .6-1 amps, 6400 RPM.
Combustion Levels CO2: 10-11%, CO: less then 0.04 percent (400 PPM) air free
+2.58" W.C. EF(60,100)T199
+1.50" W.C. EF100T150 (see note 2)
+1.22" W.C. EF60T150, EF100T250
+2.08" W.C. EF60T125
+0.55" W.C. EF100T300 (see note 3)
7
7