John Wood 300 Series User manual

1
Instruction Manual
PRINTED 0419 100313414_2000557009_Rev C
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
POWER VENT/POWER DIRECT VENT GAS MODELS
WITH DIRECT SPARK IGNITION
300/301 SERIES MODELS
CANADIAN MANUAL
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, CALL THE TECHNICAL SUPPORT PHONE NUMBER SHOWN ON THE WATER HEATER LABELING.
RESIDENTIAL GAS WATER HEATERS
•For Your Safety •
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
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LOW LEAD
CONTENT

2
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE.................................3
APPROVALS .................................................................................3
GENERAL SAFETY INFORMATION .............................................4
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*URXQGLQJ,QVWUXFWLRQV .............................................................4
+\GURJHQ*DV)ODPPDEOH .......................................................4
INTRODUCTION ...........................................................................7
$EEUHYLDWLRQV8VHG ..................................................................7
4XDOL¿FDWLRQV ............................................................................7
3UHSDULQJ)RU7KH,QVWDOODWLRQ ..................................................7
DIMENSIONS AND CAPACITY DATA ...........................................8
5RXJK,Q'LPHQVLRQV*DOORQ8QLW ......................................8
5RXJK,Q'LPHQVLRQV*DOORQ8QLW ......................................8
FEATURES AND COMPONENTS ..............................................10
&RQWUROV$QG6ZLWFKHV ...........................................................13
INSTALLATION CONSIDERATIONS ..........................................14
/RFDWLQJ7KH:DWHU+HDWHU ....................................................14
,QVXODWLRQ%ODQNHWV .................................................................15
&RPEXVWLRQ$LU$QG9HQWLODWLRQ ..............................................15
INSTALLATION REQUIREMENTS .............................................16
&KHPLFDO9DSRU&RUURVLRQ......................................................16
Water Piping ...........................................................................16
3RZHU6XSSO\ .........................................................................16
0L[LQJ9DOYHV..........................................................................17
*DV6XSSO\6\VWHPV ..............................................................18
*DV3UHVVXUH5HTXLUHPHQWV ..................................................18
6XSSO\*DV5HJXODWRU ............................................................18
6SDFH+HDWLQJ$QG3RWDEOH:DWHU6\VWHP ............................19
&ORVHG:DWHU6\VWHPV ...........................................................19
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7HPSHUDWXUH3UHVVXUH5HOLHI9DOYH ........................................20
&RQGHQVDWH3LSLQJ .................................................................20
+LJK$OWLWXGH,QVWDOODWLRQV .......................................................21
VENTING INSTALLATION ..........................................................22
9HQW,QVWDOODWLRQ&RQVLGHUDWLRQV .............................................22
3RO\SURS\OHQH,QVWDOODWLRQV .....................................................23
9HQW3LSH7HUPLQDWLRQ.............................................................24
3ODQQLQJ7KH9HQW6\VWHP .....................................................24
,QVWDOODWLRQ2I+RUL]RQWDO7KURXJK7KH:DOO9HQW6\VWHP ......24
'LUHFW9HQW7HUPLQDO,QVWDOODWLRQ .............................................25
'LUHFW9HQW$LU,QWDNH0RLVWXUH3URWHFWLRQ ..............................25
,QVWDOODWLRQ6HTXHQFH .............................................................25
7HUPLQDWLRQ&OHDUDQFHV6LGHZDOO3RZHU9HQW ........................26
7HUPLQDWLRQ&OHDUDQFHV6LGHZDOO'LUHFW9HQW .........................27
9HUWLFDO9HQW7HUPLQDO,QVWDOODWLRQ ...........................................28
'LUHFW9HQW'LDJUDP ...............................................................29
&RQFHQWULF9HQW,QVWDOODWLRQ ....................................................30
/RZ3UR¿OH7HUPLQDWLRQ,QVWDOODWLRQ ........................................33
WATER HEATER INSTALLATION ...............................................34
&RQGHQVDWH'UDLQ,QVWDOODWLRQ ................................................34
Gas Piping ..............................................................................35
TEMPERATURE REGULATION .................................................36
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7KHUPRVWDW&RQWURO .................................................................36
+LJK7HPSHUDWXUH$SSOLFDWLRQV ...............................................36
CONTROL SYSTEM OPERATION .............................................37
&RQWURO6\VWHP1DYLJDWLRQ .....................................................37
8VHU6HWWLQJV&RQWURO6\VWHP0HQXV .................................40
FOR YOUR INFORMATION ........................................................46
6WDUW8S&RQGLWLRQV ................................................................46
2SHUDWLRQDO&RQGLWLRQV ...........................................................46
START UP ...................................................................................47
Prior to Start Up ......................................................................47
LIGHTING THE WATER HEATER ..............................................48
/LJKWLQJDQG2SHUDWLRQ/DEHOV ...............................................48
PERIODIC MAINTENANCE ........................................................49
9HQWLQJ6\VWHP,QVSHFWLRQ .....................................................49
$QRGH5RG,163(&7,21 ......................................................49
7HPSHUDWXUH3UHVVXUH5HOLHI9DOYH7HVW ................................50
'UDLQLQJDQG)OXVKLQJ ............................................................50
6HUYLFH ...................................................................................51
LEAKAGE CHECKPOINTS .........................................................52
TROUBLESHOOTING ................................................................53
,QVWDOODWLRQ&KHFNOLVW ...............................................................53
6HTXHQFH2I2SHUDWLRQ ..........................................................53
6HTXHQFH2I2SHUDWLRQ)ORZ&KDUW .......................................54
2SHUDWLRQDO3UREOHPV .............................................................55
)DXOW$QG$OHUW&RQGLWLRQV ......................................................56
DIAGRAMS .................................................................................58
:LULQJ'LDJUDP ................................................................. 
&&%&HQWUDO&RQWURO%RDUG/D\RXW ......................................60
NOTES ........................................................................................61

3
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DANGER
WARNING
CAUTION
CAUTION
DANGER indicates an imminently
hazardous situation which, if not avoided,
will result in injury or death.
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in injury or death.
CAUTION indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
CAUTION used without the safety alert
symbol indicates a potentially hazardous
situation which, if not avoided, could result in
property damage.
APPROVALS
SAFE INSTALLATION, USE AND SERVICE
LOW LEAD
CONTENT

4
PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS
BEEN EXPOSED TO FLOODING OR WATER DAMAGE.
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GROUNDING INSTRUCTIONS
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HYDROGEN GAS FLAMMABLE
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
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SUREDEO\EHDQXQXVXDOVRXQGVXFKDVDLUHVFDSLQJWKURXJKWKHSLSH
DV WKH ZDWHU EHJLQV WR ÀRZ THERE SHOULD BE NO SMOKING
OR OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
Explosion Hazard
Overheated water can cause
water tank explosion.
Properly sized temperature and
pressure relief valve must be
installed in the opening provided.
Verify the power to the water heater is turned off before performing any service procedures. The
Enable/Disable switch on front panel disables the 24 volt gas valve. Electrical supply must be
turned off at circuit breaker serving water heater.
Improper installation, use and service may result
in property damage.
Do not operate water heater if exposed to flooding or water
damage.
•
Inspect anode rods regularly, replace if damaged.
•
Install in location with drainage.
•
Fill tank with water before operation.
•
Properly sized thermal expansion tanks are required on all
closed water systems.
•
Refer to this manual for installation and service.
CAUTION
GENERAL SAFETY INFORMATION

5
GENERAL SAFETY INFORMATION

6
Fire Hazard
Do not install water heater on
carpeted floor.
Do not operate water heater if
exposed to flooding or water
damage.
For continued protection against
risk of fire:
Fire or Explosion Hazard
Read instruction manual before
installing, using or servicing
water heater.
Avoid all ignition sources if you smell gas.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
Use only the gas shown on the water heater rating plate.
Keep ignition sources away from faucets after extended
periods of non-use.
Maintain required clearances to combustibles.
Do not expose water heater controls to excessive gas
pressure.
Do not obstruct water heater air intake
with insulating blanket.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
Property Damage Hazard
All water heaters eventually leak.
•
Do not install without adequate drainage.
•
CAUTION
Fire and Explosion Hazard
Leak test gas connections
before placing the water heater in
operation.
Disconnect gas piping at main
gas shutoff valve before leak
testing.
Install sediment trap in accordance
with NFPA 54 or CSA B149.1.
Use joint compound or Teflon tape
compatible with propane gas.
Fire and Explosion Hazard
Excessive gas pressure to gas valve can
cause serious injury or death.
Do not use water heater with any gas
other than the gas shown on the rating
plate.
Turn off gas lines during installation.
Contact a qualified installer or service
technician for installation and service.
Turn off power to the water heater
before performing any service.
Electrical Shock Hazard
•
Label all wires prior to disconnecting
when performing service. Wiring errors
can cause improper and dangerous
operation.
•
Verify proper operation after servicing.
•
Failure to follow these instructions can
result in personal injury or death.
•
GENERAL SAFETY INFORMATION

7
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QUALIFIED INSTALLER OR SERVICE AGENCY
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INTRODUCTION

8
DIMENSIONS AND CAPACITY DATA
ROUGH IN DIMENSIONS: 50 GALLON UNIT
Figure 1A: DIMENSIONS FOR 75 GALLON UNIT
ROUGH IN DIMENSIONS: 75 GALLON UNIT
Figure 1: DIMENSIONS FOR 50 GALLON UNIT
Table 1 – ROUGH-IN-DIMENSIONS
Units A B C D E F G H I
50G ,QFKHV   22  3886265
FP 169.5 125.09 55.88 40.00 7.62 20.32 20.32 157.48 165.1
75G ,QFKHV    16  88 59
FP 165.7 115.9 70.5 40.6 9.4 20.3 20.1 145.7 149.8
Top Inlet and Outlet: 50G - 3/4” NPT; 75G - 1” NPT
Side Inlet and Outlet: 3/4” NPT
Gas Inlet: 1/2” NPT
Condensate drain outlet: 1/2” NPT
FRONT VIEW BACK VIEW

9
DIMENSIONS AND CAPACITY DATA
Table 2 – CAPACITY, GAS AND ELECTRICAL CHARACTERISTICS
$SSUR[LPDWH&DSDFLW\ 0DQLIROG3UHVVXUH (OHFWULFDO&KDUDFWHULVWLFV
86*DOV Liters Gas Type “WC kPA 9ROWV+] $PSHUHV
50 189 1DW/3 00 <5
75 284 1DW/3 00 <5
* The manifold pressure is the factory setting and is not adjustable. A negative pressure will be seen with just the blower running without
the Gas Control Valve open.
All models - Maximum Supply Pressure: 14 inches W.C. (3.48kPa)
Minimum Supply Pressure for Natural Gas: 3.50” (.87kPa)
Minimum Supply Pressure for Propane Gas: 8.00” (1.99kPa)
Minimum pressure must be maintained under both load and no load (dynamic and static) conditions.
Table 3 – RECOVERY CAPACITIES
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Input 5HFRYHU\&DSDFLWLHV
Rating
%WXKU
Rating
N:
7HPS 
Rise
F30405060708090100110120130140
C172228333944505661677278
100,000 29.3 GPH 387 291 233 194 166 145 129 116 106 97 90 83
LPH 1465 1102 882 734 628 549 488 439 401 367 341 314

10
4
67
5
9
* CAUTION HARNESS HAS 120 VAC. IN OPERATION.
** See Venting Installation and Condensate Piping for more information.
Figure 1B : 50 GALLON UNIT
VACUUM RELIEF
VALVE
*INSTALL PER
LOCAL CODES
50 GALLON UNIT
FEATURES AND COMPONENTS
**13
**14
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