Bradford White D Series Service Manual page 5

Power Supply
Current Draw
Gas Supply Connection
Approved Gas Type
Gas Pressure (Nat. & L.P.)
Venting System
Minimum Clearance for Servicing
Maximum Water Supply Pressure
Thermostat Sensor(s)
Control Board
Control Display
Transformer
Pilot
Flue Damper
Dedicated 120 VAC, 60 Hz., 15 A
Less than 5 Amps.
1" NPT connection to gas valve for 370,000 Btu/hr. and over for natural gas,
¾" NPT for rest. Schedule 40 black iron pipe recommended.
Natural or Propane. Gas supply must match the gas type listed on the water
heater rating label.
Manifold Pressure: 4.5" w.c. natural gas, 10.0" w.c. L.P. Gas Supply
Pressure: At least 1" above manifold pressure with water heater operating,
14" w.c. maximum.
Atmospherically Vented, Type B venting system or approved chimney. Follow
current National Fuel Gas Code requirements or in Canada, the Natural Gas
and Propane Installation Code.
24" Front Clearance, 20" Top, 6" Sides.
150 PSI.
Redundant thermister with 11,900 + or - 0.5% ohms resistance at 70 deg. F.
Sensor inside well for lower sensor. Some models use an additional upper
sensor (w/o well) with same resistance values.
Honeywell Integrated Control Board for Temperature Control, Flue Damper,
and Ignition Control Functions. Operates on 24 volts AC current from
transformer. Some models use single sensor boards, others use two
sensors.
Honeywell LCD Control Display with Temperature Setpoint, Format, and Error
Code Display in User Mode, Diagnostic Functions in Service Mode.
Communicates with Control Board.
120 VAC Primary, 24 VAC Secondary, 40 VA.
Intermittent Pilot with Spark Electrode and Flame Sensor monitored by Control
Board.
24 VAC, 60 Hz., 80 Ma.
Page 5
Specifications
5