Bradford White RG2PDV40S6N, RG2PDV50S6N, RG2PDV50H6N, RG2PDV75H6N User Manual

PDV Series

Power Direct Vent Gas Water Heaters

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

PDV Series Models:
RG2PDV40S*(N,X)
RG2PDV50S*(N,X)
RG2PDV50H*(N,X)
RG2PDV75H*(N,X)
LG2PDV50H60*(N,X)
LG2PDV75H80*(N,X)
(*) Denotes Warranty Years

Manual 238‐51541‐00B 08/18

Save this manual for future reference

The Bradford White

PDV Series

Powered Direct Vent Gas Water Heaters

Table of Contents

Page PDV Service Procedure

Introduction.................................................................................................................................4 ---

How to Use This Manual ..........................................................................................................5 ---

Tools Required for Service........................................................................................................5 ---

Specifications..............................................................................................................................6 ---

Control Timings.........................................................................................................................9 ---

Sequence of Operation ..............................................................................................................10 ---

Troubleshooting .........................................................................................................................14 ---

Burner Inspection, Cleaning & Replacement ..........................................................................16 I

Pilot Testing, Cleaning & Replacement ................................................................................... 17 II

Pressure Switch Testing & Replacement .................................................................................18 III

Blower Testing & Replacement ...............................................................................................20 IV

Blower TemperatureSwitch Testing & Replacement ............................................................22 V

Gas Control Testing & Replacement........................................................................................24 VI

Flammable Vapor Sensor Testing and Replacement ..............................................................28 VII

Safety Circuit Voltage Trace.....................................................................................................29 VIII

115 VAC Circuit Trace .............................................................................................................30 IX

Diptube Inspection & Replacement..........................................................................................31 X

Anode Inspection & Replacement............................................................................................32 XI

Flue Baffle/Core Inspection & Replacement........................................................................... 33 XII

Inner Door Removal, Inspection & Replacement................................................................... 34 XIII

Glossary of Terms......................................................................................................................37 ---

Parts List .....................................................................................................................................38 ---

2

2

2

PDV Series

WARNING: If the information in these

instructions is not followed exactly, a fire or
explosion may result causing property damage,
personal injury, or death.

WHAT TO DO IF YOU SMELL GAS!

x

Do not try to light any appliance.

Do not touch any electrical switch; do not use any

x

phone in your building.

Immediately call your gas supplier from a neighbor's phone.

x

Follow the gas supplier's instructions.

If you cannot reach your gas supplier, call the fire

x

department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.

DANGER

Do not store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids in
the vicinity of this or any other appliance.

IMPORTANT

Before proceeding, please inspect the

water heater and its components for

possible damage. DO NOT install any

water heater with damaged

components. If damage is evident
then please contact the supplier where
the water heater was purchased or the

manufacturer listed on the rating plate

for replacement parts.

WARNING

Water heaters are heat producing appliances. To avoid damage

or injury, do not store materials against the water heater or vent-

air intake system. Use proper care to avoid unnecessary contact

(especially by children) with the water heater and vent-air intake

components. UNDER NO CIRCUMSTANCES MUST

FLAMMABLE MATERIALS, SUCH AS GASOLINE OR PAINT

THINNER BE USED OR STORED IN THE VICINITY OF THIS

WATER HEATER, VENT-AIR INTAKE SYSTEM OR IN ANY

LOCATION FROM WHICH FUMES COULD REACH THE

WATER HEATER OR VENT-AIR INTAKE SYSTEM

CAUTION

If sweat fittings are to be used DO NOT apply heat to the nipples

on top of the water heater. Sweat the tubing to the adapter

before fitting the adapter to the water connections. It is

imperative that heat is not applied to the nipples containing a

plastic liner.

WARNING

Hydrogen gas can be produced in an operating water heater that

has not had water drawn from the tank for a long period of time

(generally two weeks or more). Hydrogen gas is extremely

flammable. To prevent the possibility of injury under these

conditions, we recommend the hot water faucet to be open for

several minutes at the kitchen sink before you use any electrical

appliance which is connected to the hot water system. If
hydrogen is present, there will be an unusual sound such as air
escaping through the pipes as hot water begins to flow. Do not

smoke or have open flame near the faucet at the time it is open.

WARNING

DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE
NOT CERTAIN OF THE FOLLOWING:

x

Liquefied petroleum gases/propane gas and natural gas
have an odorant added by the gas supplier that aids in the
detection of the gas.

x

Most people recognize this odor as a “sulfur” or “rotten egg”
smell.

x

Other conditions, such as “odorant fade” can cause the
odorant to diminish in intensity, or “fade”, and not be as
readily detectable.

x

If you have a diminished sense of smell, or are in any way
unsure of the presence of gas, immediately contact your gas
supplier from a neighbor’s telephone.

Gas detectors are available. Contact your gas supplier, or plumbing
professional, for more information.

WARNING

FAI LU RE TO INST ALL AND MAINTAIN A NEW, LISTED ¾” X ¾”

TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE

THE MANUFACTURER FROM ANY CLAIM THAT MIGHT RESULT

FROM EXCESSIVE TEMPERATURE AND PRESSURES.

CAUTION

Turn off or disconnect the electrical power supply to the water heater
before servicing. Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing.

3

3

3

PDV Series

Introduction

The new Bradford White PDV water heaters are designed to provide reliable performance with enhanced
standard features. New design features include reliable spark to pilot ignition system, enhanced diagnostics,
simplified servicing, significantly quiet operation, additional vent lengths, and Bradford White Defender
Safety System

Spark to Pilot Ignition System - employing the spark to pilot ignition system promotes reliable and consistent
pilot and main burner ignitions to provide hot water on demand.

Integrated Immersion Thermostat/Gas Control Valve with LED - was developed for ease of troubleshooting
by providing simple diagnostic codes to pinpoint an installation or component performance issue.

Powerful Blower - will eliminate problems with difficult venting situations.

Quieter and Cooler Blower Operation - blower noise is significantly reduced for both interior and exterior
environments. Cooler operation increases blower life by reducing bearing wear and noise.

Rugged Wiring Connections - receptacle type connections promote error free wiring.

Increased Vent Lengths - increased venting performance is achieved while maintaining Energy Factor &
FHR (not applicable on all models) performance.

®

(not available on all models).

The PDV water heaters use a combustion system where flue gases are combined with dilution air to reduce
the flue gas temperature in the blower. The diluted flue gases are evacuated to the exterior through low
temperature vent materials. The gas control maintains water temperature, ignition sequence and regulates
gas flow. A safety circuit consisting of a pressure switch and blower temperature switch verifies proper
conditions exist for safe and reliable operation. If a situation outside of normal operating parameters exists,
the gas control diagnostic LED will flash a code to positively identify an operational issue.

This service manual is designed to facilitate problem diagnosis and enhance service efficiency.

Please read the service manual completely before attempting service on this new series of power direct vent
models.

How the Safety System Works

During normal operation, air for combustion is drawn into the water heater through the vent pipe from outside
your building. This air travels into the closed combustion chamber. The air then mixes in a normal manner
with supplied gas and it’s efficiently combusted, producing low NOx emissions.

In the unlikely event trace amounts of flammable vapors are present in the area surrounding the water
heater, the sealed combustion system prevents the flammable vapors from reaching the ignition source. In
addition the flammable vapors sensor will stop the water heater from operating if a significant amount of
flammable vapors are present.

4

4

4

PDV Series

It is intended for this manual to be used by qualified service personnel for the primary purpose of
troubleshooting and repair of the Bradford White PDV Series water heaters. Understanding the sequence of
operation section of this manual will contribute greatly to troubleshooting the water heater.

The Honeywell WV4462A Electronic Gas Control will display status codes in the event of abnormal
operation. Status codes are listed in the troubleshooting chart beginning on page 14 of this service manual.
The troubleshooting chart will also indicate the probable cause for the status code and direct the service
professional to a service procedure to properly diagnose the abnormal operation.

In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent system to
determine the problem.

Contact the Bradford White technical support group immediately if diagnosis cannot be made using the
methods described in this service manual.

Tools Required for Service

Manometer:

Multi-Meter:

Electronic Probes:

Thermometer:

Water Pressure Gage:

Various Hand Tools:

A liquid “U” tube type or a digital (magnahelic) type can be used. This
device is used to measure gas and/or air pressure and vacuum.

A digital type is strongly recommended. This device is used to measure
electrical values. The meter you select must have the capability to
measure volts AC, volts DC, Amps, micro-amps and ohms.

In some cases, standard multi-meter probes will damage or simply not be
effective to obtain certain voltage and ohm readings. It will be necessary to
have special electronic “pin” type multi-meter probes. These probes are
available at most electronic wholesale outlets.

Used to measure water temperature. An accurate thermometer is
recommended.

Used to measure water supply pressure. Also used to determine tank
pressure by adapting to the drain valve of the heater.

Pipe wrench, channel locks, open end wrenches (3/8”, 7/16”, 1/2”), 12”
crescent wrench, allen wrench set, screw drivers (common & Phillip’s), 1/4”
nut driver, pliers (common & needle nose), socket set, side cutters, wire
cutters, wire strippers, wire crimpers, torpedo level, small shop vac, step
ladder, flashlight and 5 gallon pail.

5

5

5

PDV Series

Power supply Dedicated 115 VAC, 60 Hz, 15A.
Gas Supply Pipe Minimum 1/2” NPT (schedule 40 black iron pipe recommended).
Approved Gas
Type

Gas Pressure

Venting System Power direct vent through the wall or vertical through the roof.
Approved Vent
Materials
Minimum
Clearance for
Servicing
Water Supply
Pressure
Gas Control
ECO Limit
Residential
Temperature Set
Point Range
Commercial

Temperature Set
Point Range

Natural Gas or Propane, unit must match gas type supplied.

5.0” W.C. min. for Natural Gas, 11.0” W.C. min. for Propane, 14.0” W.C. maximum
(Natural Gas & Propane).

PVC, CPVC or ABS.

18” from top, 24” from front, 4” sides and rear.

150 PSI maximum allowable working pressure. Check local codes for supply
pressure.

Residential 188°F (87°C), Commercial 199°F (93°C).

60°F (16°C) to 160°F (71°C) (approximate temperatures).

80°F (27°C) to 180°F (82°C) (approximate temperatures).

Blower
Temperature
Switch

Pressure Switch

Blower

Normally closed, opens @ 155°F (68°C), auto reset @ 135°F (57°C).

Normally open, closes on vacuum increase @ -.80” W.C.;
Opens on vacuum decrease @ -.73” W.C.
115 VAC, 60 Hz, 3.1 amps, 3000 RPM.

6

6

PDV Series

Vent Tables

Venting Specifications for:

RG2PDV(40,50)S

2" Diameter (5.1 cm) Vent Connector Lengths

Terminating

# of

Elbows

Maximum Straight

Length ft. (m)

Minimum Straight

Length ft. (m)

Through the Wall

Through the Wall

Through the Wall

Through the Wall

Through the Roof

Through the Roof

Through the Roof

Through the Roof

3" Diameter (7.6 cm) Vent Connector Lengths

Terminating

Through the Wall

Through the Wall

Through the Wall

Through the Wall

Through the Wall

Through the Roof

Through the Roof

Through the Roof

Through the Roof

Through the Roof

1

2

3

4

0

1

2

3

# of

Elbows

1

2

3

4

5

0

1

2

3

4

30 (9.1) 2 (.6)

25 (7.6)

20 (6.1) 2 (.6)

15 (4.6) 2 (.6)

35 (10.7) 7 (2.1)

30 (9.1)

25 (7.6) 7 (2.1)

20 (6.1) 7 (2.1)

Maximum

Straight

Length ft. (m)

80 (24.4) 10 (3.1)

75 (22.9) 10 (3.1)

70 (21.3) 10 (3.1)

65 (19.8) 10 (3.1)

60 (18.3) 10 (3.1)

85 (25.9) 15 (4.6)

80 (24.4) 15 (4.6)

75 (22.9) 15 (4.6)

70 (21.3) 15 (4.6)

65 (19.8) 15 (4.6)

2 (.6)

7 (2.1)

Minimum

Straight

Length ft. (m)

7

7

7

PDV Series

Venting Specifications for:

RG2PDV(50,75)H
LG2PDV(50,75)H

3" Diameter (7.6 cm) Vent Connector Lengths

Terminating

# of

Elbows

Maximum Straight

Length ft. (m)

Minimum Straight

Length ft. (m)

Through the Wall

Through the Wall

Through the Wall

Through the Wall

Through the Roof

Through the Roof

Through the Roof

Through the Roof

4" Diameter (7.6 cm) Vent Connector Lengths

Terminating

Through the Wall

Through the Wall

Through the Wall

Through the Wall

Through the Wall

Through the Roof

Through the Roof

Through the Roof

Through the Roof

Through the Roof

1

2

3

4

0

1

2

3

# of

Elbows

1

2

3

4

5

0

1

2

3

4

55 (16.8) 2 (.6)

50 (15.2)

45 (13.7) 2 (.6)

40 (12.2) 2 (.6)

60 (18.3) 7 (2.1)

55 (16.8)

50 (15.2) 7 (2.1)

45 (13.7) 7 (2.1)

Maximum

Straight

Length ft. (m)

95 (29.0) 10 (3.1)

90 (27.4) 10 (3.1)

85 (25.9) 10 (3.1)

80 (24.4) 10 (3.1)

75 (22.9) 10 (3.1)

100 (30.5) 15 (4.6)

95 (29.0) 15 (4.6)

90 (27.4) 15 (4.6)

85 (25.9) 15 (4.6)

80 (24.4) 15 (4.6)

2 (.6)

7 (2.1)

Minimum

Straight

Length ft. (m)

8

8

PDV Series

Control Timings

Ignition State Timing

Pre-purge
Trial for Ignition 90 Seconds

Flame Stabilization Period
Inter-purge

Flame Failure Response Time

Post-purge 15 Seconds
PS Fault Delay (failed open/close) Retry after 2 Minutes
Soft Lockout Retry after 5 Minutes
ECO Limit Lockout Indefinite (see page 25)
Verify Resistive Delay Retry after 2 Minutes (repeats 5 times)
Flammable Vapor Sensor/Simulated Resistive Load
Lockout

Hardware Status Lockout

15 Seconds

3 Seconds
15 Seconds

1.5 Seconds (2 seconds. maximum; 1 second
minimum.)

Indefinite (cycle power to restart)

Indefinite (self clears if fault clears for at least 15
seconds)

9

9

9

PDV Series

Power Up Sequence

1. Start Up.
Upon Power up, the control runs a safe-start check with a typical start-up delay of
1-5 seconds.

2.

Flammable Vapor.
To assure no outputs are energized if the “Flammable Vapor Sensor” is out of
range, the control will test the “Flammable Vapor Sensor” or for proper operating
range. If the “Flammable Vapor Sensor” is out of range, the control LED
immediately flashes 7 times with 3 second pause.

Normal Heating Sequence

1.

Thermostat calls for heat.
Prior to energizing blower, gas control checks safety circuit to insure the circuit is
open. Normal switch positions in the safety circuit are as follows:

a) Exhaust pressure switch normally open.
b) Blower temperature switch normally closed.

If the safety circuit is closed, the control waits 4 seconds, gas control LED
flashes 2 times with 3 second pause. Gas control waits 2 minutes then,
blower runs for 30 seconds. This cycle repeats until safety circuit opens.

2.

Blower energizes.

3.

Blower pre-purge period (15 seconds)

4.

Differential pressure switch proves blower/vent system operation.
If the pressure switch does not close within 30 seconds, the control LED flashes 3
times with 3 second pause. The blower runs for 30 seconds every 2 minutes trying
to get the pressure switch or blower temperature switch to close. This cycle repeats
as long as there is a call for heat.

5.

Trial for pilot ignition (90 seconds).

a.

The gas control lights the pilot by activating spark igniter and gas flow to pilot
burner.

b.

If flame is not sensed within 90 seconds, igniter and gas flow are
deactivated, blower will post purge and control LED flashes 6 times with 3
second pause.

6.

Main burner ignition.
After pilot flame is sensed, gas control activates main valve for main burner ignition.
The gas control will ignore flame and pressure switch signals for 3 seconds allowing
for main burner to stabilize.

10

10

10

PDV Series

Normal Heating Sequence (cont.)

7. Steady state operation.

During steady state operation, the control monitors:

Thermostat temperature sensor-when set point temperature is satisfied, gas
valve is shut down and blower will post purge for 15 seconds. Control LED flashes
a short flash once every 4 seconds (idle) status code.

Pressure switch / blower temperature switch-if either switch opens, pilot valve
and main valve is shut down. The blower continues to run for 30 seconds
attempting to close the circuit. The control LED flashes 3 times with 3 second
pause.

Flame sensor-if flame is lost, pilot & main valve are shut down, blower runs for 15
seconds. Control attempts to re-light pilot 4 times. If unsuccessful, blower is shut
down and control proceeds to 5 minute lockout. Control re-attempts to light pilot
starting at normal heating sequence #2.

Thermostat satisfies. (Control LED flashing once every 4 seconds).

8.

Burner off.

9.

10. Blower post purges (15 seconds).

Abnormal Operation

1. Flammable Vapor Sensor:

a.

If the resistance is greater than 70,000 Ohms-the gas control immediately
turns off all outputs. Control waits and monitors resistance for 30 seconds.
If the resistance is greater than 65,000 ohms after 30 seconds, the gas
control proceeds to verify resistive delay for 2 minutes and flashes 7 times
then once with a three second pause. This process is repeated 5 times until
the control either returns to normal operation or proceeds to flammable vapor
lockout.

b.

If the resistance is below 3000 Ohms-The gas control immediately turns
off all outputs and proceeds to flash 8 times then once with three second
pause. The status self clears if the resistance returns to normal range for at
least 15 seconds.

2. Temperature Sensor Fault:

a.

Temperature sensor detected open circuit–The gas control immediately
turns off all outputs and proceeds to flash 8 times then, 3 times with 3
second pause. The status self clears if the fault clears for at least 15
seconds.

b.

Thermal well sensor not reading the same temperature within ±5.5°F –
The gas control immediately turns off all outputs and proceeds to flash 8

11

11

11

PDV Series

Abnormal Operation (cont.)

times, then 3 times twice with 3 second pause. The status self clears if the
fault clears for at least 15 seconds.

c. Water temperature in excess of ECO (energy cut out) limit -The gas

control immediately turns off pilot & main valves and proceeds to flash 4
times with 3 second pause. Blower continues to run until gas control is reset.
To reset control, rotate knob of temperature control to the minimum setting
for at least 6 seconds before returning to desired temperature setting.

3. Pressure Switch/Blower Temperature Fault:
a.

Pressure switch closed at start of call for heat-the gas control waits 4
seconds then, proceeds to flash 2 times with 3 second pause. The control
waits 2 minutes and then turns on blower for 30 seconds. The blower turns
off after 30 seconds and the control waits for pressure switch to open. Any
time the pressure switch opens, the blower turns on (or stays on) and the
control proceeds to wait for pressure switch to close.

b.

Pressure switch or blower temperature switch failed to close-the gas
control runs the blower for 30 seconds waiting for the pressure switch and/or
blower temperature switch to close. If either switch does not close in 30
seconds, the blower turns off and the control flashes 3 times with 3 second
pause. The gas control waits 2 minutes before turning on the blower for
another 30 seconds to see the circuit close. This cycle repeats as long as
there is a call for heat or until the circuit closes.

c.

Pressure switch or blower temperature switch opens during burner
operation-the gas control turns off the pilot and main valve, runs blower for

15 seconds (inter-purge) waiting for pressure switch and/or blower
temperature switch to close. If either switch fails to close, the control
proceeds as described in 3b above, if the circuit closes again by the end of
the inter-purge, the recycle counter is incremented, if the recycle count as
not reached its limit (4), another trial for ignition begins. If the recycle count
has been reached, the gas control turns off the blower and flashes 6 times
then, 2 times with 3 second pause. The gas control waits 5 minutes before
repeating ignition sequence.

4. Trail for Ignition Fault:
a.

Pressure switch opens during trial-the gas control turns off igniter and
pilot valve. The gas control proceeds as described in 3b above. If the
pressure switch closes within 30 seconds the gas control will continue with
trial for ignition starting at blower pre-purge.

b.

Flame not sensed-the gas control energizes the spark igniter attempting to
light the pilot and prove flame. If flame is not sensed within 90 seconds, the
igniter turns off, the pilot valve is closed and the gas control runs the blower
through post purge and flashes 6 times then, once with 3 second pause.
The control waits 5 minutes before repeating the ignition sequence.

12

12

12

PDV Series

Abnormal Operation (cont.)

5. Flame sensing fault:
a.

Flame lost during run-the gas control turns off pilot and main valves, runs
blower for 15 seconds (inter-purge). The gas control increments the recycle
count, if the recycle count has not reached its limit (4), another trial for
ignition begins. If the recycle count has been reached, the gas control turns
off the blower and flashes 6 times then, 3 times with 3 second pause. The
gas control waits 5 minutes before repeating the ignition sequence.

b.

Flame sensed out of sequence-the gas control only looks for pilot flame
when the blower is running. If flame is present when the pilot valve is not
open, the gas control proceeds to wait for flame loss and flashes 5 times with
3 second pause. This continues until flame is lost. Once the flame signal is
lost, the control flashes 6 times then, 4 times with 3 second pause.
control waits 5 minutes before repeating the ignition sequence.

The

13

13

13

PDV Series

Observe green LED indicator on
Electronic gas control. Status flash
codes are displayed with a three second
pause before repeating. Check and
repair the system as noted in the
troubleshooting table below

LED Status Control Status Probable Cause

None, control
LED not on or
flashing

Short flash, once
every four
seconds

“Heartbeat”,
alternates
bright/dim

Short flash once
per second

Two flash, three
second pause

Three flash,
three second
pause

Four flash, three
second pause

Five flash, three
second pause

No electrical
power

Stand-by mode,
Waiting for call
for heat (no fault).
Thermostat

calling
for heat (no fault).

Weak pilot signal
on last call for
heat.

Pressure switch
not working­closed position.

Pressure switch
or blower temp.
switch not
working -open
position.

Excessive tank
temperature.
System must be

reset.
Undesired-false
pilot flame
present.

Control power switch in “OFF” position.
Supply voltage interrupted.

Temperature demand is satisfied.

Tank temperature below set point of
thermostat.

1. Unstable pilot.

2. Pilot tube block or restricted.

3. Oxidation builds up on pilot electrode.

4. Wire damage to pilot assembly or bad
connection at gas valve.

1. Pressure switch tubing kinked or blocked.

2. Blocked pressure tap on switch or blower.

3. Faulty pressure switch.

1. Vent blockage or improper vent

configuration.

2. Pressure switch tubing kinked or blocked.

3. Faulty pressure switch.

4. Blower not spinning up to speed.

5. Blower temp or exhaust temp too high.

6. Faulty blower temperature switch.

1. Temperature sensor out of calibration.

2. Faulty gas control.

3. Plumbing leak.

1. Pilot valve stuck in open position.

Service

Procedure

Turn power on

Normal operation.
Adjust thermostat to
temp level
Normal operation.
Adjust thermostat to
temp level

Page 17

Page 18

1. Check vent or vent
tables.

2 & 3 Page 18

4. Page 20

5 & 6 Page 22

1 & 2. Replace gas
control, page 26

Replace gas control,
page 26

14

14

14

PDV Series

LED Status Control Status Probable Cause

g

Six-one
flash, three
second
pause

Six-two flash,
three second
pause

Six-three
flash, three
second
pause

Six-four
flash, three
second
pause

Seven flash,
three second
pause
Eight-one
flash, three
second
pause
Eight-two
flash, three
second
pause
Eight-three
flash, three
second
pause
Eight-four
flash, three
second
pause

Failed to light
pilot.
System auto

resets.

Pressure switch
or blower temp
switch opened
during burner
operation.
System auto

resets.

Pilot flame
extinguished.
System auto

resets.

Undesired-false
pilot flame
sensed.
System auto

resets.
Flammable vapor
sensor fault
detected.

Flammable vapor
sensor out of
specification.

Temperature
Sensor fault.

Gas valve
electronics fault
detected.

Gas valve fault
detected.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad
connection at gas valve.

1. Vent blockage or improper vent configuration.

2. Pressure switch tubing kinked or blocked.

3. Faulty pressure switch.

4. Vent termination being affected by wind.

5. Blower not spinning up to speed.

6. Blower temp or exhaust temp too high.

7. Faulty blower temperature switch.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad
connection at gas valve.

5. Insufficient combustion air.

6. Gas pressure is out of specification..

Pilot valve stuck in open position.

Flammable vapor sensor or simulative resistance
device out of specification.

Flammable vapor sensor or Simulated resistive
device out of specification.

1. Damage to temperature sensor wire.

2. Temperature sensor resistance out of range.

1. Control needs to be reset.

2. Control is wet or physically damaged.

1. Control needs to be reset.

2. Control is wet or physically damaged.

Service

Procedure

Page 17

1. Check vent or vent tables.

2&3Page18

4.

Refer to venting section of
installationmanual

5.

Page 20

6&7Pa

1-4. Page 17

5.
manual

6.

Replace gas control,
page 26

Page 28

Page 28

Replace gas control,
page 26.

1.

2.

1.

2.

e 22

Refer to installation

Page 24

Interrupt power supply
Replace gas control,
page 26

Interrupt power supply
Replace gas control,
page 26

15

15

15

PDV Series

Burner Inspection

At periodic intervals (every 6 months) a visual inspection should be made of the pilot and main
burner for proper operation and to assure no debris is accumulating.

Pilot flame should be stable, some causes for an unstable pilot flame are:

a)

Water heater vent is less than the allowable vent length.

b)

Gas pressure is out of specification.

c)

Pilot flame not fully engulfing spark/flame sensor.

Main burner should light smoothly from pilot and burn with a blue flame with a minimum of yellow
tips.

Main burner must be free from any debris accumulation that may affect burner operation (see
burner cleaning procedure on page 16).

Burner Cleaning

Step 1.

Step 2.
Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Step 8.
Step 9.

Step 10.

Step 11.

Position gas control power switch to the
“OFF” position and unplug heater from
wall outlet.
Turn off gas supply to water heater.
Remove outer jacket door and inner door
per service procedure XIII on page 34.
Disconnect pilot tube (7/16” wrench) and
feedline (3/4” wrench) from gas control.
Disconnect igniter/flame sensor wire from
gas control.
Remove burner assembly from
combustion chamber.
Thoroughly inspect burner surface area
and burner port area and remove any
loose debris.
Unscrew burner from main burner orifice.
Remove main burner orifice from feedline
(1/2” wrench on steel burners) inspect
orifice, clean or replace if necessary.
Reassemble burner and reinstall into
water heater. Restore gas supply and
check for gas leaks.
To resume operation, follow the
instruction located on the lighting
instruction label or the lighting instruction
located in the installation and operation
manual.

16

16

16

PDV Series

Pilot Testing and Replacement

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.
Step 6.
Step 7.
Step 8.

Step 9.

Step 10.

Step 11.

Step 12.

Step 13.

Step 14.

Step 15.

Position gas control power
switch to the “OFF” position
and unplug heater from wall
outlet.
Turn off gas supply to water
heater.
Remove outer jacket door and inner door per
service procedure XIII on page 34.
Disconnect pilot tubing nut (7/16” wrench) and
feedline nut (3/4” wrench) from gas control.
Disconnect igniter/flame sense wire from gas control.
Remove burner assembly from combustion chamber.
Remove pilot assembly from feedline (1/4” nut driver).
Visually inspect igniter/flame sense wire for damage.
found.
With a multi-meter set to ohms setting, check
continuity through igniter/flame sense wire. Replace
pilot if no continuity.
Visually inspect igniter/flame sense
electrode for deterioration. Replace pilot as
necessary. Electrode should not be in
contact with pilot hood, if so, carefully adjust
electrode to a gap of distance of 3/32” (.09)
from pilot hood.
Visually inspect igniter/flame sense
electrode for oxidation build up. Carefully
clean any oxidation using very fine emery
cloth.
Visually inspect pilot tubing for kinks or
cracks. If damage is found, replace pilot.
Inspect pilot tubing and pilot orifice for
blockage:

a.

Remove ferrule nut from bottom of pilot
assembly (7/16” wrench).

b.

Remove pilot tube and pilot orifice.

c.

Inspect pilot tubing and pilot orifice for blockage. Clean or replace as necessary.
Reassemble pilot and install on feedline. Reinstall burner assembly to water
heater. Restore gas supply and check for gas leaks.
To resume operation, follow the instruction located on the lighting
instruction label or the lighting instruction located in the installation and
operation manual.

Replace pilot if damage is

17

17

17

PDV Series

Pressure Switch Testing

Step 1.

Step 2.

Step 3.

Position power switch on gas
control to the “OFF” position.
Remove the three screws (Phillips screw driver) from control access cover
on blower assembly and remove cover (see photo 1).
Carefully remove pressure switch from blower housing (see photo 2).

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

18

18

18

PDV Series

Pressure Switch Replacement

Step 1.

Step 2.

Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.

Step 10.

Position gas control power
switch to “OFF” position.
Remove the three screws
(Phillip’s screw driver) from
control access cover on blower
assembly and remove cover
(see photo 3).
Carefully remove pressure switch from blower housing (see photo 4).
Disconnect tubing from pressure switch. (see photo 5).
Disconnect yellow wires from pressure switch (see photo 6).
Reconnect wires from step 6 to new pressure switch.
Reconnect tubing to new pressure switch.
Carefully position pressure switch into blower housing.
Position gas control power switch to “ON” position and verify proper heater
operation.
Replace control access cover from step 2.

115 volt potential exposure. Use

caution to avoid personal injury.

WARNING

19

19

19

PDV Series

Blower Testing

Step 1.

Step 2.

Position gas control
power switch to “ON”
position and adjust control
to call for heat.
Remove the three screws
(Phillip’s screw driver) from
control access cover on blower
assembly and remove cover (see
photo 7).

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

20

20

20

PDV Series

Blower Removal

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.
Step 6.
Step 7.

Step 8.

Step 9.

Position gas control power switch to
“OFF” position and adjust control to call
for heat.
Unplug blower power cord from wall
outlet.
Disconnect vent system from exhaust
adapter on top of blower.
Remove exhaust adapter from blower
(blade screw driver) and retain for use
on new blower.
Unplug cord sets from blower.
Remove vertical air intake bracket.
Disconnect vertical air intake from
blower.
Remove the three blower mounting
screws (1/4” nut driver).
Remove blower with gasket from
water heater.

Blower Installation

Step 10.

Step 11.

Step 12.

Step 13.

Step 14.

Step 15.
Step 16.

Step 17.

Step 18.

Clean any debris from jacket head
of water heater.
Set new blower with gasket in
place using locating pins on
blower flange to line up with
location holes in jacket head. Be
sure not to damage gasket.
Secure blower in place using
mounting screws from step 8.
Re-install exhaust adapter from
step 4.
Reconnect vent system to exhaust
adapter.
Reconnect cord sets from step 5.
Plug blower power cord into wall
outlet.
Position gas control power switch
to the “ON” position.
Verify proper blower operation.

21

21

21

PDV Series

Blower Temperature Switch
Testing

Position the power switch on the gas control to
the “OFF” position.

Step 1.

Step 2.

Remove the three screws (Phillip’s
screw driver) from control access
cover on blower and remove cover
(see photo 14).
Locate blower temperature switch
(see photo 15).

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

22

22

PDV Series

Blower Temperature Switch
Replacement

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.
Step 7.

Step 8.

Step 9.

Step 10. Replace control access cover from

Position gas control power switch to
the “OFF” position and unplug heater
from wall outlet.
Remove the three screws (Phillip’s
screw driver) from the control access
cover on blower and remove cover
(see photo 16).
Locate blower temperature switch
(see photo 17).
Disconnect red and yellow wire leads
from switch.
With an appropriate tool such as side
cutters, snip the retaining lug from the
blower housing to allow removal of
temperature switch (see photo 18).
Remove switch from blower housing.
Install new switch. Be sure switch is
properly seated in mounting area.
Reconnect red and yellow wires to
new switch. Wires are
interchangeable with either terminal.
Position gas control power switch to
the “ON” position and verify proper
heater operation.

step 2.

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

23

23

23

PDV Series

24

Honeywell Gas Control Testing & Replacement

Line Pressure

The Gas Control is designed for a maximum line pressure of 14.0” W.C. and a minimum
line pressure of 1.0” W.C. over the water heater’s rated manifold pressure (check rating
plate). Line pressure must be check with the main burner on and off to assure proper
readings.

Manifold Pressure Testing

(This procedure presumes a maximum line pressure of

14.0” W.C.)

Step 1.
Step 2.

Step 3.
Step 4.

Step 5.

Step 6.

Step 7.

Set the Gas Control to the “OFF” position.
Remove pressure tap plug and install 1/8”
NPT pipe, coupling & pressure tap.
Connect manometer to pressure tap.
Follow instructions located on the lighting
instructions label and proceed to light the
main burner and observe manometer
reading.
Proper operating range for Natural Gas is

4.0” ±0.5” W.C. Proper operating range
for Propane gas is: 10.0” ±0.5” W.C.
If pressure is within the range specified in
the previous step, set Gas Control knob to
the “OFF” position, remove manometer
and pressure tap, and replace pressure
tap plug. Check for gas leaks prior to
placing water heater back into operation
by following the instructions located on
the lighting label or the lighting
instructions located in the installation and
operation manual.
If gas pressure is outside the specification
noted above, refer to “Honeywell Gas
Control Testing, Disassembly and
Replacement” to replace gas control or
valve body.

24

24

PDV Series

25

ECO (Energy Cut Out) Reset

The Honeywell Gas Control is designed with an ECO device that will reset.

To reset the Gas Control after a status code (4), turn the Gas Control knob to the “OFF”
position and wait a minimum of (5) minutes before relighting following the instructions
located on the lighting instruction label or the lighting instructions located in the
installation and operation manual.

Determine Water Temperature Inside Tank

WARNING

Stored water may be HOT WHEN PERFORMING THE FOLLOWING STEPS IN

THIS PROCEDURE. Take necessary precaution to prevent personal injury.

Step 1.
Step 2.

Step 3.

Position gas control power switch to “OFF” position.
Draw approximately 4 gallons of water from drain valve into a container
and discard. Draw an additional gallon and immediately measure water
temperature using an accurate thermometer. It may be necessary to open
a hot water faucet to allow heater to drain.
Compare the measured water temperature with the setting on the gas
control.
10°F.

In most instances, they should not differ by more than approx.

25

25

PDV Series

Gas Control Removal From Water Heater

Step 1.

Step 2.
Step 3.

Step 4.
Step 5.
Step 6.

Step 7. Removal of Gas Control

Position gas valve power switch to the “OFF” position and
unplug heater from power supply.
Drain heater to a point below the gas control level.
Turn off gas supply to water heater and disconnect gas
piping from gas control.
Disconnect wire harnesses from gas control.
Remove outer jacket burner access door.
Right side inner door removal.

a.

Remove (2) hex drive screws from RIGHT side inner
door.

b.

Remove (2) hex drive screws from FLANGE SECTION
of inner door.

c.

Remove right side inner door and set aside. Be careful not to damage
gasket material in inner door.

a.
b.

Disconnect main burner feedline and pilot tube.
Remove Gas Control from water heater by rotating counter clockwise.
DO NOT use a wrench on the Gas Control body, damage to the Gas
Control may occur. If necessary, use a length of ½” NPT pipe
threaded into gas inlet of Gas Control.

Step 8. Install new Gas Control into water heater.

26

26

a.

b.
c.

26

Install new Gas Control into water heater by rotating clockwise. DO
NOT use a wrench on the Gas Control body, damage to the Gas
Control may occur. If necessary, use a length of ½” NPT pipe
threaded into gas inlet of Gas Control.
Reattach main burner feedline, pilot tube and thermopile wire.
Reconnect gas supply piping to inlet of Gas Control.

PDV Series

Reinstallation of Inner Door Assembly.

d. Prior to reinstallation of inner door, fully inspect for the following:

-Tears

-Missing Material

-Cracks

-Dirt or debris

If the gasket is not affected by any of the above, gasket replacement will not
be required. If replacement is required, replace using new gasket kit following
the instructions provided with kit.

e.

Clean any gasket residue or other debris from combustion chamber surface
before installing the inner door/gasket assembly.

f.

Position thermopile wire and pilot tube against left side inner door flange
gasket. DO NOT ROUTE THROUGH RADIUSED CHANNEL WITH
FEEDLINE. Be sure that thermopile and pilot tube are not in position to
interfere with outer jacket burner access door when reinstalled.

g.

Firmly place right side inner door flange against the left side inner door flange
and secure with (2) hex drive screws from step 6c. DO NOT OVER TIGHTEN

SCREWS.

h.

Align right side inner door to combustion chamber and verify the fastener holes
of the combustion chamber are aligned with the right side inner door slotted
openings. Verify seal integrity around combustion chamber opening. Secure
right side inner door using (2) hex drive screws from step 6b. DO NOT OVER
TIGHTEN SCREWS. Verify both left and right sides of the inner door are
properly positioned and sealed against the combustion chamber.

-Other imperfections that will inhibit proper seal

-Gasket adhesion to inner door

-Material left on combustion chamber (around opening)

CAUTION

A seal breach may result in a fire or explosion

causing property damage, personal injury or death.

Step 9.
Step 10.
Step 11.

Step 12.

Replace outer jacket burner access door.
Reconnect gas supply to Gas Control.
Resume water supply to water heater.
Be sure tank is full of water before
resuming operation.
To resume operation follow the
instructions located on the lighting
instruction label or the lighting
instructions located in the installation and
operation manual.

27

27

27

PDV Series

Flammable Vapor Sensor
Testing

Step 1. Position power switch on gas

control to the “OFF” position.

Step 2. Disconnect flammable vapor

sensor from gas control.

Step 3. Using a multi-meter set to the

ohms setting, check resistance of
flammable vapor sensor.
Resistance must be within 3,000
ohms and 48,000 ohms. If outside
of this range replace Flammable
Vapor Sensor.

CAUTION

DO NOT use a standard multi-meter probe for this

test. Doing so will damage connector. Use

special pin type electronic probes or small

diameter wire pins inserted into connector.

28

28

28

PDV Series

Safety Circuit Voltage
Trace

NOTE: This procedure assumes a cool tank.

Remove Three screws (Phillips Screw driver) from control

access cover on blower and remove cover (see photo 21)

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

.

29

29

29

PDV Series

115 VAC Circuit Trace

Step 1. Verify 115 VAC and proper polarity

at wall outlet.

Step 2.

With unit plugged in and control

power switch in the “ON” position

verify LED status.

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

30

30

30

PDV Series

Diptube Inspection & Replacement

WARNING

Water Heater components and stored water may be HOT when performing the

following steps in this procedure. Take necessary precaution to prevent

personal injury.

Step 1.

Step 2.

Step 3.
Step 4.

Step 5.

Step 6.

Step 7.

Position on/off switch of gas control valve to “OFF” position and unplug water heater from wall
outlet.
Turn off cold water supply to water heater. Connect hose to drain valve of water heater and
route to an open drain. Open a nearby hot water faucet to vent heater for draining. Open drain
valve of water heater and allow heater to drain to a point below the inlet connection nipple.
Disconnect inlet nipple from plumbing system.
With an appropriate tool such as a pipe wrench, remove inlet nipple/dip tube from the water
heater. Use caution not to damage pipe threads.
Visually inspect inlet nipple/dip tube. Inlet nipple/dip tube should be free of cracks and any
blockage. Hydrojet slots should be open and free of any blockage. Any damage such as
cracks, restriction due to deformation or unintentional holes are not field repairable and the inlet
nipple/dip tube must be replaced.
Upon completion of inspection or subsequent replacement, reinstall inlet nipple/dip tube into
water heater. Ensure pipe dope is used on the nipple’s threads. Connect nipple to plumbing
system, resume water supply and refill with water.
To resume operation follow the instructions located on the lighting instruction label or the lighting
instructions located in the installation and operation manual.

31

31

31

PDV Series

32

Anode Inspection & Replacement

WARNING

Water Heater components and stored water may be HOT when performing the

following steps in this procedure. Take necessary precaution to prevent

personal injury.

Step 1.

Step 2.

Step 3.
Step 4.

Step 5.

Step 6.

Step 7.

Position on/off switch of gas control valve to the “OFF” position and unplug water heater from
wall outlet.
Turn off cold water supply to water heater. Connect hose to drain valve of water heater and
route to an open drain. Open a nearby hot water faucet to vent water heater for draining.
Open drain valve of water heater and allow water heater to drain to a point below the outlet
connection nipple.
Disconnect outlet nipple from plumbing system.
With an appropriate tool such as a pipe wrench, remove outlet nipple/anode from the water
heater. Use caution not to damage pipe threads.
Visually inspect outlet nipple/anode. Outlet nipple/anode should show signs of depletion, this
is normal. If depletion is ½ of the original anode diameter (approximately ¾” diameter),
replacement is recommended. If any of the steel core of the anode is exposed, replacement is
recommended.
Upon completion of inspection or subsequent replacement, reinstall outlet nipple/anode into
water heater. Ensure pipe dope is used on the nipple’s threads. Connect nipple to plumbing
system, resume water supply and refill with water.
To resume operation, follow the instructions located on the lighting instruction label or the
lighting instructions located in the installation and operation manual.

32

32

PDV Series

Flue Baffle/Core Inspection and Replacement

Step 1.

Step 2.

Step 3.

Step 4.
Step 5.

Step 6.
Step 7.

Step 8.

Step 9.

Step 10.

Step 11.
Step 12.

Step 13.

Step 14.

Position gas control power switch to the “OFF”
position and unplug blower from wall outlet.
Disconnect vent system from exhaust
adapter on top of blower.
Disconnect intake air piping.

Unplug cord sets from blower (see photo 28).
Remove the three blower mounting screws
(1/4” nut driver) (see photo 28).
Remove blower with gasket from water heater.
Remove flue baffle or flue core from heater
(see photos 29a and 29b).
Inspect baffle or core for deterioration, missing
restrictors.
Clean any scale or debris build up. Replace
with new baffle or core as necessary.
Reinstall baffle or core into flue tube. Be sure
hanger tabs are inserted into notch location at
the top of the flue tube (see photos 30 & 31).
Check burner to insure no scale has
accumulated during this operation.
cleaning procedure on page 16.
Reinstall blower on water heater.
Reinstall vent system with
the support bracket
Connect cord sets to blower.
Plug water heater into wall
outlet.
To resume operation follow
the lighting instruction
location on the lighting
instruction label or the
lighting instructions located
in the installation operation
manual.

See burner

33

33

33

PDV Series

Inner Door Removal Procedure

Step 1.

Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.

Step 8.

-Tears

-Missing material

-Cracks

-Dirt or debris

Position gas control power switch to the “OFF”
position.
Remove outer jacket burner access door.
Remove wire tie from feedline.
Remove (2) ¼” hex drive screws from right side inner door.
Remove (2) ¼” drive screws from flange section of inner door.
Remove (2) ¼” drive screws from left side inner door.
Remove inner door and inspect per step 8.

Fully inspect inner door gaskets for the following:

-Other imperfections that will inhibit proper seal

-Gasket adhesion to inner door

-Material left on combustion chamber (around opening)

If the gasket is not affected by any of the above, gasket replacement is not required.
required, proceed to Inner Door Gasket Replacement Procedure.

Inner Door Gasket Replacement Procedure

WARNING

If the information in these instructions is not followed exactly, a
fire or explosion may result causing property damage, personal

injury or death.

34

34

Step 9.

Step 10.

34

After inspection of inner door as noted in step 8, completely remove gasket and adhesive residue
from right and left side inner doors as needed.
Use RTV sealant (recommended bead size 1/8”) to secure the inner door gasket to the inner door
sections (right & left). Refer to illustration on next page for proper application. Note the overlap
configuration in the flange area of the inner door. Set the flange section first, this will help to
achieve the proper overlap position.

If replacement is

PDV Series

Installation of Inner Door with Gasket

Step 11.

Step 12.

Step 13.

Clean any residual gasket residue or other debris
from combustion chamber surface before installing
the inner door/gasket assembly.
Place the left side inner door into position first.
Firmly position the radiused channel of the inner
door around the feedline. Using the ¼” hex drive
screws from step 6, secure left side inner door in
place. DO NOT OVER TIGHTEN SCREWS
Position pilot tube and igniter/sensor wire against
left side inner door flange gasket. DO NOT

ROUTE THROUGH RADIUSED CHANNEL WITH
FEEDLINE.

WARNING

Stripped fastener connections

may allow for seal breach of

inner door. A seal breach may

result in a fire or explosion

causing property damage,

personal injury or death. Do

not over tighten screws in

steps 12, 14 and 15.

35

35

35

PDV Series

Installation of Inner Door with Gasket (cont.)

Step 14. Firmly place right side inner door flange against the left side inner door flange and secure with

(2) ¼” hex drive screws from step 5. DO NOT OVER TIGHTEN SCREWS.

Step 15.

Align right side inner door to combustion chamber and verify the fastener holes of the
combustion chamber are aligned with right side inner door slotted opening. Verify seal integrity
around combustion opening. Secure right side inner door using ¼” hex drive screws from step

4. DO NOT OVER TIGHTEN SCREWS. Verify both left and right sides of inner door are
properly positioned and sealed against the combustion chamber.

36

36

Step 16.
Step 17.

36

Replace outer jacket burner access door.
To resume operation follow the instructions located on the lighting instruction label or the lighting
instructions located in the installation and operation manual.

PDV Series

Frozen Exhaust Vent Terminal(s)

If an intake or exhaust vent terminal is blocked with ice or snow due to severe conditions, the pressure
switch and control will not allow the burner to operate. This will result in a three flash status code. Once the blockage is
removed (through melting or other means) the controls will let the burner operate. The position of the vent terminals in
relation to each other and terminals from other appliances can have an effect on the potential for blockage due to ice or
snow. See the installation instructions for recommended positioning of the terminals.

Testing under severe conditions has shown that the optional concentric vent terminal is resistant to ice
blockage. Contact Bradford White or the supplier of the water heater for information about ordering the optional
concentric vent terminal.

Bradford White has also developed an air intake relief device that can be installed in the air intake near the water
heater temporarily enabling the water heater to operate with a frozen intake terminal. Contact Bradford White or the
supplier of the water heater for information about the air intake relief device.

Glossary of Terms

BTU
GPM
Hz
KWh
LED
NPT
Ohms
PSI
RPM
ECO
VAC
“ W.C.
ºC
ºF

British Thermal Units
Gallons per minute
Hertz
kilowatt hour Light
Emitting Diode National
Pipe Thread Ohm
s of resistance Pounds
per square inch
Revolutions per minute
Energy Cut Out
Volts Alternating Current
Inches of Water Column
Degrees Centigrade
Degrees Fahrenheit

37

37

37

PDV Series

1.

Blower Complete

2.

Temperature Switch

3.

Pressure Switch

4.

Blower Gasket

5.

Tee and Vent Pipe Ass’y

6.

Vent Adapter w/ Term.

7.

Intake Terminal

8.

Vent Terminal Elbow

9.

Exhaust adapter

10.

Condensate Hose Kit

11.

Flue Reducer (50H Only)

38

38

38

12.

Heat Trap Outlet

13.

Hot Water Outlet Anode

14.

Flue Baffle (except 75H)

15.

Heat Trap Inlet

16.

Inlet Dip Tube

17.

Wire Harness

18.

T&P Valve

19.

¾ NPT Plug

20.

Direct Vent boot
escutcheon

21.

Air intake boot

22.

Air intake boot gasket

23.

Outer Door

24.

Right side inner door

25.

Left side inner door

26. Screw #10-12 x ¾

27.

Screw #8-15 x ¾

28.

Drain valve

29.

FV Sensor

30.

FV Sensor harness

31.

FV Sensor Clip

32.

Gas Control

33.

Burner Assy.

34.

Main Burner

35.

Main Burner Orifice

36.

Pilot Assy.

37.

Pilot Orifice

38.

Feedline

39.

Inner Door Gasket Kit

40.

Kit-Heat Trap insert

41.

Flue core (75H only)

42.

ASSE Approved Mixing
Valve