John Wood Commercial Atmospheric Vent User Manual
MODELS JWSM & AJWSM
NSF 5
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
Thank you for buying this energy efcient water heater from GSW
Water Heating. We appreciate your condence in our product.
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE
READ THOROUGHLY BEFORE INSTALLING AND USING
THIS APPLIANCE.
599 Hill Street West
Fergus, ON Canada N1M 2X1
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PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED 0909 316314-002
1
ROUGH-IN-DIMENSIONS
JWSM71120 THROUGH (A) JWSM100390 - TABLE 1A
See Models Below
FIGURE 1
MODEL
JWSM71120
JWSM81154
JWSM95199
JWSM76199
(A)JWSM100199
(A)JWSM65251
(A)JWSM100275
(A)JWSM65305
(A)JWSM65365
(A)JWSM100390
INPUT RATE
BTU/Hr.
120,000 BTU/Hr.
35 Kw/Hr
154,000 BTU/Hr
45 Kw/Hr
199,000 BTR/Hr
58 kW/Hr
199,000 BTU/Hr
58 kW/Hr
199,000 BTR/Hr
58 kW/Hr
251, 000 BTR/Hr
73 kW/Hr
275,000 BTR/Hr
80 kW/Hr
305,000 BTR/Hr
89 kW/Hr
365,000 BTR/Hr
107 kW/Hr
390,000 BTU/Hr
114 kW/Hr
APPROX
TANK
CAP.
71 Gal
268 L
81 Gal
307 L
100 Gal
379 L
81 Gal
307 L
100 Gal
379 L
65 Gal
246 L
100 Gal
379 L
65 Gal
246 L
85 Gal
322 L
100 Gal
379 L
A B C D E F
69.75”
4.25”
59.50”
50.87”
177cm
73.00”
185cm
75.00”
192cm
67.50”
171 cm
72.00”
183cm
75.00”
191 cm
72.00”
183cm
75.00”
191 cm
79.50”
202cm
75.50”
192cm
11cm
4.25”
11cm
4.50”
12cm
4.50”
12cm
4.50”
12cm
4.50”
12cm
4.50”
12cm
4.50”
12cm
4.50”
12cm
4.50”
12cm
151cm
66.50”
169cm
70.00”
178cm
62.00”
157cm
65.13”
165cm
65.75”
167cm
65.13”
165cm
65.75”
167cm
70.25”
178cm
67.50”
171cm
129cm
57.87”
147cm
61.62”
157cm
53.62”
136cm
55.87”
142cm
57.25”
145cm
55.87”
142cm
57.25”
145cm
62.50”
159cm
58.25”
148cm
19.69”
50cm
19.69”
50cm
20.50”
52cm
20.50”
52cm
19.75”
50cm
20.00”
51cm
19.75”
50cm
20.00”
51cm
22.50”
57cm
26.75”
68cm
GAS
INLET
G
19” 48 cm1/2”
1/2”
19”
1/2”
48cm
1/2”
21”
1/2”
53cm
1/2”
21”
1/2”
53cm
1/2”
23”
1/2”
58cm
1/2”
N/A
1/2”
N/A
1/2”
23”
1/2”
58cm
1/2”
N/A
1/2”
N/A
1/2”
23”
3/4”
58cm
3/4”
23”
3/4”
58cm
3/4”
H
51.88”
132cm
59.00”
150cm
62.62”
159cm
54.62”
139cm
56.38”
143cm
58.75
149cm
56.38”
143cm
58.75
149cm
63.00
160cm
59.00”
150cm
VENT
DIAIJ
6”
15cm
6”
15cm
6”
15cm
6”
15cm
6”
15cm
8”
20cm
8”
20cm
8”
20 cm
8”
20cm
8”
20cm
27.75”
71 cm
27.75”
71 cm
27.75”
71 cm
27.75”
71 cm
30.25”
77cm
27.75”
70cm
30.25”
77cm
27.75”
70 cm
27.75”
70cm
30.25”
77cm
TOP
1.50”
1.50”
1 .50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
N/A
N/A
1.50”
1.50”
N/A
N/A
1.50”
1.50”
1.50”
1.50”
CONNECTIONS
INLET OUTLET
FRONT
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
1.50”
1.50”
2.00”
2.00”
BACK TOP
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
2.00”
2.00”
1 .50”
1.50”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
N/A
N/A
1.50”
1.50”
N/A
N/A
1.50”
1.50”
1.50”
1.50”
FRONT BACK
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
1.50”
1.50”
2.00”
2.00”
.50”
.50”
.50”
.50”
.50”
.50”
.50”
.50”
2.00”
2.00”
1.50”
1.50”
2.00”
2.00”
1.50”
1.50”
1.50”
1.50”
2.00”
2.00”
Approximate
ship. Weight
400 Lbs
182 Kg
470 Lbs
213 Kg
603 Lbs
273 Kg
470 Lbs
213 Kg
630 Lbs
286 Kg
750 Lbs
341 Kg
630 Lbs
286 Kg
750 Lbs
341 Kg
725 Lbs
329 Kg
760 Lbs
345 Kg
JWSM & AJWSM MODELS - TABLE 1B
MODEL
INPUT RATE
BTUH
APPROX.
GAL. CAP.
EFF.
30° F 40° F 50° F 60° F 70° F 80° F 90° F 100° F 110° F 120° F 130° F 140° F
%
(-)1°C 4°C 10° C 15° C 21° C 27° C 32° C 38° C 43° C 49° C 54° C 60° C
JWSM71120
JWSM81154
JWSM95199
JWSM76199
(A)JWSM100199
(A)JWSM65251
(A)JWSM100275
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(A)JWSM65-05
(A)JWSM65365
(A)JWSM100390
120,000 BTUH
35 Kw/Hr
154,000 BTUH
45 Kw/Hr
199,000 BTUH
58 Kw/Hr
199,000 BTUH 5
8 Kw/Hr
199,000 BTUH
58 Kw/Hr
251,000 BTUH
73 Kw/Hr
275,000 BTUH
80 Kw/Hr
305,000 BTUH
89 Kw/Hr
365,000 BTUH
107 Kw/Hr
390,000 BTUH
114 Kw/Hr
71 Gal
268 L
81 Gal
306 L
95 Gal
360 L
76 Gal
288 L
100 Gal
379 L
65 Gal
246 L
100 Gal
379 L
65 Gal
246 L
65 Gal
246 L
100 Gal
379 L
388
498
643
614
643
811
889
986
291
1102
373
1412
482
1825
461
1745
482
1825
608
2303
667
2524
739
2799
873
3304
970
3671
80
1469
80
1885
80
2434
80
2324
80
2434
80
3071
80
3365
80
3732
1164
80
4405
1293
80
4894
RECOVERY RATING CAPACITIES (GPH AND LPH)
233
194
166
145
129
882
299
1132
386
1461
368
1393
386
1461
487
1843
533
2019
592
2239
698
2643
776
2936
734
249
943
322
1219
307
1162
322
1219
406
1536
444
1682
493
1866
582
2202
646
2447
628
213
806
276
1045
263
996
276
1045
348
1316
381
1442
423
1599
499
1888
554
2097
549
187
708
241
912
230
871
241
912
304
1152
333
1262
370
1399
436
1652
485
1835
488
166
628
214
810
205
776
214
810
270
1024
296
1122
329
1244
388
1468
431
1631
116
439
149
564
193
731
184
697
193
731
243
921
267
1009
296
1120
349
1321
388
1468
106
401
136
515
175
662
167
632
175
662
221
838
242
918
269
1018
317
1201
353
1335
97
367
124
469
161
609
154
583
161
609
203
768
222
841
246
933
291
1101
323
1224
90 4183
115
435
148
560
142
538
148
560
187
709
205
776
228
861
269
1016
298
1129
STD. ASME
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
725 Lbs
329 Kg
862 Lbs
391 Kg
725 Lbs
329 Kg
862 Lbs
391 Kg
833 Lbs
379 Kg
874 Lbs
396 Kg
314
107
405
132
500
132
500
132
500
174
658
190
721
211
800
249
944
277
1049
2
TABLE OF CONTENTS
Page
ROUGH-IN-DIMENSIONS .................................................2-3
TABLE OF CONTENTS .........................................................4
FOREWORD .........................................................................4
GENERAL SAFETY INFORMATION .....................................5
Chemical Vapor Corrosion .....................................................5
Improper Combustion ............................................................5
Liquid Petroleum Models .......................................................5
Extended Non-Use Periods ...................................................5
Insulation Blankets .............................................................5-6
High Altitude Installation ........................................................6
FEATURES ............................................................................6
The Eliminator (Self-Cleaning System) .................................6
High Limit Switch (E.C.O.) ..................................................6-7
Electronic Ignition Control......................................................7
Automatic Flue Damper Device .............................................7
Circulating Pump ...................................................................7
Dishwashing Machine Requirement ...................................7-8
INSTALLATION INSTRUCTIONS .........................................8
Uncrating ...............................................................................8
Locating The Heater ..............................................................8
Levelling ................................................................................8
Clearances .........................................................................8-9
Installation on Combustible Flooring .....................................9
Hard Water ............................................................................9
Air Requirements ..............................................................9-10
Unconned Space ...............................................................9
Conned Space .................................................................10
Vent Reducer .......................................................................10
Venting.................................................................................10
Multiple Heater Manifold ......................................................10
Water Line Connections ......................................................10
Technical Data Venting ...................................................11-12
Water (Potable) Heating and Space Heating ......................13
Thermometers (Not Supplied) .............................................13
Relief Valve ..........................................................................13
Gas Piping ......................................................................13-14
Gas piping and Dirt Leg Installation................................14-15
Gas Pressure Regulator ......................................................15
Page
Grounding Instructions ........................................................15
Heater Wiring.......................................................................15
INSTALLATION DIAGRAMS ..........................................15-21
MANIFOLDS ........................................................................22
MECHANICAL VENTING ....................................................23
Single Unit Installation .........................................................23
Vent Installation ...................................................................23
Multiple Unit Installation.......................................................23
OPERATION ........................................................................24
General ................................................................................24
Filling ...................................................................................24
Purging ................................................................................24
Lighting and Operating Labels........................................25-26
Water Temperature Control .................................................27
Testing Damper Control .......................................................27
Checking Venting............................................................27-28
PREVENTIVE MAINTENANCE ...........................................28
Check The Pilot ...................................................................28
Pilot Burner ..........................................................................28
Main Burner ....................................................................28-29
Gas Valves ..........................................................................29
Checking The Input .............................................................29
Venting System....................................................................30
Remote Storage Tank Temperature Control ........................30
Relief Valve ..........................................................................30
Hot Water Odor ...................................................................30
Anode Rod Inspection .........................................................30
Recommended Procedure For Periodic Removal
of Lime Deposits From Tank Type Commercial
Water Heaters ................................................................30-31
Deliming Solvents ................................................................31
Tank Cleanout Procedures .............................................31-32
Troubleshooting Ignition Module System ............................32
SERVICE .............................................................................32
Electrical Servicing ..............................................................32
Replacement Parts ..............................................................32
Efkal Flue Damper Troubleshooting Guide ........................33
Operational Checklist ..........................................................34
Limited Warranty .................................................................35
FOREWORD
These designs comply with ANSI Z21.10.3/CSA 4.3 as an automatic
circulating or automatic storage tank type water heater.
Heaters having an input of 305,000 (89 Kwh), 365,000 (107 Kwh),
390,000 (114 Kwh) and 500,000 (147 Kwh) Btuh with a recovery
rating of 277.3 gph (1049 Lph) or more also comply with ANSI
Z21.10.3 as an automatic instantaneous type heater.
Detailed installation diagrams are found in this manual. These
diagrams will serve to provide the installer with a reference for the
materials and methods of piping necessary. It is highly essential that
all water, gas piping and wiring be installed as shown on the
diagrams.
Particular attention should be given to the installation of
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thermometers at the locations indicated on the diagrams as these
are necessary for checking the proper functioning of the heater.
This model water heater is designed and manufactured in both
natural gas and propane versions. MAKE SURE the gas on which
the heater will operate is the same as that specied on the heater
model and rating plate.
These heaters may be installed on combustible oors.
In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations in force in the
local area where the installation is to be made. These shall be
carefully followed in all cases. Authorities having jurisdiction should
be consulted before installations are made.
In the absence of local codes, the installation must comply with
the current editions of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 and the National Electrical Code, NFPA 70 or CAN/
CSA-B149.1, the Natural Gas and Propane Installation Code
and CSA C22.1, the Canadian Electrical Code. All documents are
available from the Canadian Standards Association, 8501 East
Pleasant Valley Road, Cleveland, OH 44131. NFPA documents
are also available from the National Fire Protection Association,
1 Batterymarch Park, Quincy, MA 02269.
3
GENERAL SAFETY
INFORMATION
PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN
UNDER WATER. Immediately call a qualied service technician
to inspect the appliance and to replace any part of the control
system and any gas control which has been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE
BEEN MADE BY A QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING
CHEMICAL VAPOR CORROSION
LIQUID PETROLEUM MODELS
Water heaters for propane or liqueed petroleum gas (LPG) are
different from natural gas models. A natural gas heater will not
function safely on LP gas and no attempt should be made to
convert a heater from natural gas to LP gas.
LP gas must be used with great caution. It is highly explosive
and heavier than air. It collects rst in the low areas making its
odor difcult to detect at nose level. If LP gas is present or even
suspected, do not attempt to nd the cause yourself. Go to a
neighbor’s house, leaving your doors open to ventilate the house,
then call your gas supplier or service agent. Keep area clear until
a service call has been made.
At times you may not be able to smell an LP gas leak. One cause
is odor fade, which is a loss of the chemical odorant that gives
LP gas its distinctive smell. Another cause can be your physical
condition, such as having a cold or diminishing sense of smell
with age. For these reasons, the use of a propane gas detector
is recommended.
IF YOU EXPERIENCE AN OUT-OF-GAS SITUATION, DO
NOT TRY TO RELIGHT APPLIANCES YOURSELF, Ask your
LP delivery person to relight pilots for you. Only trained LP
professionals should conduct the required safety checks in
accordance with industry standards.
WARNING
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN
CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN
FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium
and sodium chloride (water softener salt), waxes, and process
chemicals are typical compounds which are potentially corrosive.
Do not store products of this sort near the heater. Also, air which
is brought in contact with a the heater should not contain any
of these chemicals. If necessary, uncontaminated air should be
obtained from remote or outside sources. The limited warranty
is voided when failure of water heater is due to a corrosive
atmosphere. (Refer to the limited warranty for complete terms
and conditions.)
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER
SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN
USED FOR A LONG PERIOD OF TIME (GENERALLY TWO
WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY
FLAMMABLE. To reduce the risk of injury under these conditions,
it is recommended that the hot water faucet be opened for several
minutes at the kitchen sink before using any electrical appliance
connected to the hot water system. If hydrogen is present, there
will probably be an unusual sound such as air escaping through
the pipe as the water begins to ow. THERE SHOULD BE NO
SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE TIME
IT IS OPEN.
EXTENDED NON-USE PERIODS
WARNING
INSULATION BLANKETS
IMPROPER COMBUSTION
WARNING
ATTIC AND/OR EXHAUST FANS OPERATING ON THE
PREMISES WITH A WATER HEATER CAN RESULT IN CARBON
MONOXIDE POISONING AND DEATH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE
DRAFT IN THE AREA OF THE WATER HEATER PREVENTING
THE PRODUCTS OF COMBUSTION FROM EXHAUSTING
THROUGH THE CHIMNEY OR VENT PIPE.
The venting of the water heater should be inspected by a qualied
service technician at the time of installation and periodically
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thereafter to ensure a down-draft condition does not exist.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
Insulation blankets available to the general public for external use
on gas water heaters are not approved for use on your John Wood
water heater. The purpose of an insulation blanket is to reduce
the standby heat loss encountered with storage tank water
heaters. Your John Wood water heater meets or exceeds the
current edition of ANSI/ASHRAE/IESNA Standard 90.1 1999 with
respect to insulation and standby loss requirement making an
insulation blanket unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions. Failure to follow these
instructions can result in re, asphyxiation , serious personal
injury or death.
• Do not apply insulation to the top of the water heater, as this
will interfere with safe operation of drafthood.
• Do not cover the gas valve or temperature & pressure relief
valve.
4
• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
• Do not allow insulation to come within 2” (5 cm) of the
burners, to prevent blockage of combustion air ow to the
burners.
• Do not allow insulation to come within 9” (23 cm) of oor, (within
2” (5 cm) of bottom cover) to prevent blockage of combustion
air ow to the burners.
Upon completion of derating of the heater, adjustment to the
gas pressure regulator may be required. See CHECKING
THE INPUT section in this manual for inlet and manifold
pressure requirements.
Also due to the input ratin g reduction req uired at hig h
altitudes, the output rating of the appliance is reduced and
should be compensated for in the sizing of the equipment for
application.
• Do inspect the insulation blanket frequently to make sure it
does not sag, thereby obstructing combustion air ow.
• Do obtain new labels from John Wood for placement on the
blanket directly over the existing labels.
HIGH ALTITUDE INSTALLATIONS
WARNING
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
DIFFERENT BURNER ORIFICES IN ACCORDANCE WITH
THE NATIONAL FUEL GAS CODE (ANSI Z223.1). FAILURE TO
UTILIZE THE PROPER ORIFICES WILL RESULT IN IMPROPER
AND INEFFICIENT OPERATION OF THE APPLIANCE
RESULTING IN THE PRODUCTION OF INCREASED LEVELS
OF CARBON MONOXIDE GAS IN EXCESS OF SAFE LIMITS
WHICH COULD RESULT IN SERIOUS PERSONAL INJURY
OR DEATH.
You should contact your gas supplier for any specic changes
which may be required in your area.
As elevation above sea level is increased, there is less
oxygen per cubic foot of air. Therefore, the heater input
rate should be reduc ed at high altitudes for satisfactory
operation with the reduced oxygen supply. Failure to make
this reduction would result in an over f iring of the heater
causing sooting, poor combustion and /or unsatisfactor y
heater performance.
Ratings specied by manufacturers for most appliances apply for
elevations up to 2000 feet (610 m). For elevations above 2000
feet (610), ratings must be reduced at the rate of 4% for each
1000 feet (305 m) above sea level. For example, if a heater is
rated at 120,000 Btuh (35 Kwh) at sea level, to rate the heater
at 4000 feet (1219 m), you subtract 4 (once for each thousand
feet) x 04 (4% input reduction) x 120,000 (original rating) from
the original rating. Therefore, to calculate the input rating at
4,000 feet (121.9 m): 4 x .04 x 120,000 =19,200 Btuh (5.6 Kwh),
120,000 (35 Kwh) - 19,200 (5.6 Kwh) = 100,800 Btuh (29.4 Kwh).
At 6000 feet (1829 m) the correct input rating should be 91,200
Btuh (26.7 Kwh).
FEATURES
(SELF-CLEANING SYSTEM)
These units include self-cleaning device (Self-Cleaning
System) installed in the front water inlet. See figure 2. The
Eliminator must be oriented correctly for proper function. There
is a marked range on the pipe nipple portion of the Eliminator,
that must be aligned with the top of the inlet spud. A label above
the jacket hole has an arrow that will point to the marked portion
of the pipe nipple if the orientation is correct. If the arrow does
not point within the marked range on the pipe nipple, adjust
the pipe nipple to correct. A pipe union is supplied with the
Eliminator to reduce the probability of misaligning the Eliminator
accidentally while tightening the connection to the inlet water
supply line. Improper orientation of the Eliminator can cause
poor performance of the heater and can significantly reduce
outlet water temperatures during heavy draws.
NOTE: The inlet tube may have 1, 3 or 7 cross-tubes.
FIGURE 2
For proper function, The Eliminator must be oriented correctly.
There is a marked range on the pipe nipple that must be aligned
with the top of the inlet spud (check for label on the appliance)
to assure proper orientation. Please check to conrm that the
marked range is in alignment with the top of the spud. A pipe
union is supplied with The Eliminator to help eliminate the
possibility of changing the orientation by accidentally overtightening the inlet supply line. Improper orientation of The
Eliminator may cause temperature build-up issues or spells of
colder than usual water temperatures.
HIGH LIMIT SWITCH
The input reduction is primarily achieved by reducing the
size of the main burner orifices. To do this, the main burner
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orifices require replacement wi th orifice s sized for the
particular installation elevation. Correct orifice sizing and
parts may be obtained from GSW Water Heating. When
ordering, be sure to state the model number and the altitude
of the location where the water heater is being installed.
The digital thermostat (Fig. 3) contains the high limit (energy
cutoff) sensor. The high limit switch interrupts main burner gas
ow should the water temperature reach 203°F (95°C).
In the event of high limit switch operation, the appliance
cannot be restarted unless the water temperature is reduced to
approximately 120°F (49°C). The high limit reset button on the
front of the control then needs to be depressed.
5
Continued manual resetting of high limit control, preceded by higher
than usual water temperature is evidence of high limit switch operation.
The following is a possible reason for high limit switch operation:
• A malfunction in the thermostatic controls would allow the gas
valve to remain open causing water temperature to exceed the
thermostat setting. The water temperature would continue to
rise until high limit switch operation.
Contact your dealer or service agent if continued high limit switch
operation occurs.
DIGITAL THERMOSTAT
FIGURE 3
ELECTRONIC IGNITION CONTROL
Each heater is equipped with a Honeywell ignition module. The
solid state ignition control, g.4, ignites the pilot burner gas by
creating a spark at the pilot assembly. Pilot gas is ignited and
burns during each running cycle. The main burner and pilot gases
are cut off during the OFF cycle. Pilot gas ignition is proven by the
pilot sensor. Main burner ignition will not occur if the pilot sensor
does not rst sense pilot ignition.
Each automatic ue damper drive assembly is equipped with a
“Service Switch”, as shown in gure 5.
FIGURE 5
The “S er v ic e Swi t ch ” has 2 po s it i on s : AU T OM A TIC
OP E R ATION and HOLD OPEN DAMPER. For norm a l
ope ra t io n the s w it c h sh oul d be in the AU TO M AT I C
OPERATION position.
If there is a problem with the damper the “Service Switch” can
be placed in the HOLD OPEN DAMPER position. When the
switch is placed in the HOLD OPEN DAMPER position the
damper disc will rotate to the open position and the heater
may be used until vent assembly is repaired or replaced. DO
NOT turn the damper disc manually; damage will occur to
the drive assembly if operated manually. Refer to TESTING
DAMPER OPERATION section of this manual for additional
information.
CIRCULATING PUMP
A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the heater.
Refer to the piping diagrams in this manual for electrical hookup
information and install in accordance with the current edition of
the National Electrical Code NFPA 70.
Only all bronze circulating pump should be used with commercial
water heaters.
Although circulators are oiled and operated by the manufacturer
some circulating pump must be oiled again before operating.
Please refer to manufacturer’s instructions.
DISHWASHING MACHINE REQUIREMENT
These appliances meet the NSF Standard 5 for sanitary
installations when used with leg kit, Part No. 9003425205.
All dishwashing machines meeting the National Sanitation
HONEYWELL IGNITION MODULE
S8600M Continuous Re-Try
FIGURE 4
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AUTOMATIC FLUE DAMPER DEVICE
All units are equipped with an automatic ue damper that
reduces heat loss during the OFF cycles.
Foundation requirements are designed to operate
with water flow pressures between 15 and 25 psi (103 kPa
and 173 kPa). Flow pressures above 25 psi (173 kPa),
or be l ow 15 psi (10 3 kPa), wil l re su l t in imp r op er l y
saniti z e d dishe s . Whe r e pres s ures ar e high, a water
pr es su r e r e d u c i ng or f lo w re gu la t i n g c on tr ol v a l v e
should be used in 180°F (82°C) line to the dishwashing
machine, and should be adjusted to deliver water between
these limits.
6
The National Sanitation Foundation also recommends circulation
of 180°F (82°C) water. Where this is done, the circulation
should be very gentle so that it does not cause any unnecessary
turbulence inside the water heater. The circulation should be just
enough to provide 180°F (82°C) water at the point of take-off to
the dishwashing machine. Adjust ow by means of the plug cock
in the circulating line.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN
CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE
STORED OR USED IN THE SAME ROOM WITH THE HEATER.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE
IT WILL BE SUBJECT TO FREEZING.
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD
BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE
HEATER OR CONNECTIONS WILL NOT RESULT IN DAMAGE
TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR
SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK
ARE REQUIRED.
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.
UNCRATING
The heater is shipped with the ue damper already installed. The
wiring conduit runs from the thermostat to the damper drive cover.
Before turning unit on, check to make sure the wiring conduit is
securely plugged into damper drive.
LOCATING THE HEATER
When installing the heater, consideration must be given to
proper location. Location selected should be as close to the
stack or chimney as practicable, with adequate air supply and as
centralized with the piping system as possible.
WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES
SUCH AS GAS WATER HEATERS IN ROOMS, GARAGES OR
OTHER AREAS WHERE GASOLINE, OTHER FLAMMABLE
LIQUIDS OR ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE
STORED, OPERATED OR REPAIRED. FLAMMABLE VAPORS
ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE
IGNITED BY THE HEATER’S PILOT OR MAIN BURNER FLAMES
CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES
PERMIT OPERATION OF GAS APPLIANCES IN SUCH AREAS
IF THEY ARE INSTALLED 18” (.50 m). OR MORE ABOVE THE
FLOOR. THIS MAY REDUCE THE RISK IF LOCATION IN SUCH
AN AREA CANNOT BE AVOIDED.
When such locations cannot be avoided, it is recommended that
a suitable drain pan, adequately drained, be installed under the
appliance.
Water heater life depends upon water quality, water pressure
and the environment in which the water heater is installed. Water
heaters are sometimes installed in locations where leakage may
result in property damage, even with the use of a drain pan piped
to a drain. However, unanticipated damage can be reduced or
prevented by a leak detector or water shut-off device used in
conjunction with a piped drain pan. These devices are available
from some plumbing supply wholesalers and retailers, and detect
and react to leakage in various ways:
• Sensors mounted in the drain pan that trigger an alarm or turn
off the incoming water to the water heater when leakage is
detected.
• Sensors mounted in the drain pan that turn off the water supply
to the entire home when water is detected in the drain pan.
• Water supply shut-off devices that activate based on the water
pressure differential between the cold water and hot water
pipes connected to the water heater.
• Devices that will turn off the gas supply to a gas water heater
while at the same time shutting off its water supply.
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER.
Such pans should be fabricated with sides at least 2” (5 cm) deep,
with length and width at least 2” (5 cm) greater than the diameter
of the heater and must be piped to an adequate drain. The pan
must not restrict combustion air ow.
For appliance installation locations with elevations above 2000
feet (610 m), refer to HIGH ALTITUDE INSTALLATIONS section
of this manual for input reduction procedure.
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead the
water heater must be placed on a metal or wood panel extending
beyond the full width and depth by at least 3 inches (7.6 cm) in
any direction. If the heater is installed in a carpeted alcove, the
entire oor shall be covered by the panel. Also, see the DRAIN
REQUIREMENTS.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT
SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
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WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
If the unit is not level, insert the bolts which were used in crating
into the legs to correct this condition.
These heaters are approved for installation on combustible
ooring in an alcove when the minimum clearance from any
combustion construction are followed as indicated in gure 6
and Table 2.
The following units are approved for installation with side, rear
and ceiling clearances as indicated below:
7
LEVELING
CLEARANCES
ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE
FIGURE 6
A
(
RIGHT SIDE
JWSM71120
JWSM81154
JWSM95199
JWSM76199
(A)JWSM100199
(A)JWSM65251
(A)JWSM100275
(A)JWSM65305
(A)JWSM65365 4” (10.16 cm) 4” (10.16 cm) 4” (10.16 cm)
(A)JWSM100390
1” (2.54 cm)
2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
3” (7.75 cm) 3” (7.75 cm) 3” (7.75 cm)
)B(LEFT SIDE)C(BACK)D(CEILING)
1” (2.54 cm) 1” (2.54 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
TABLE 2
In all installations the minimum combustible clearances from any
draft hood surface or vent piping shall be 6” (16cm). Vent piping
passing through a combustible wall or ceiling must be a continuous
run (no joints) and retain the 6” (16cm) clearance unless an
approved reducing thimble is used.
A service clearance of 24” (61cm) should be maintained from
serviceable parts, such as relief valves, ue bafes, ue damper
devices, thermostats, cleanout openings or drain valves.
WARNING
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATING AIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
C O M B U S TI O N A N D V E N T I L AT I O N . A N I N S U FF I C I E N T SU P P LY
OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION
PRODUCTS RESULTING IN AIR CONTAMINATION THAT
MAY BE HAZ ARD OUS TO LIFE. SUCH A C ONDITION OFTEN
WILL RESULT IN A YELLOW, LUMINOUS BURNER FLAME,
CAUSING CAR BONING OR SOOTING OF THE COM BUST ION
CHAMBER, BURNERS AND FLUE TUBES AND CREATES A
RISK OF ASPHYXIATION.
Where an exhaust fan is supplied in the same room with a
heater, sufcient openings for air must be provided in the
walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO
BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY,
CAUSING POOR COMBUSTION. SOOTING MAY RESULT
IN SERIOUS DAMAGE TO THE HEATER AND RISK OF FIRE
OR EXPLOSION.
HARD WATER
UNCONFINED SPACE
Where hard water conditions exist, water softening or threshold type
of water treatment is recommended. This will protect dishwashers,
coffee urns, water heaters, water piping and other equipment.
See MAINTENANCE section for details of tank cleanout procedure.
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AIR REQUIREMENTS
REFER TO THE CURRENT EDITION OF THE “NATIONAL FUEL
GAS CODE” ANSI Z223.1/NFPA 54.
In buildings of conventional frame, brick, or stone construction,
unconned spaces may provide adequate air for combustion,
ventilation and draft hood dilution.
If the unconned space is within a building of tight construction
(buildings using the following construction: weather stripping,
heavy insulation, caulking, vapor barrier, etc.), air for combustion,
ventilation and draft hood dilution must be obtained from
outdoors. The installation instructions for conned spaces in
tightly constructed buildings must be followed to ensure adequate
air supply.
8
CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally
constructed building to a conned space, such a space shall be
provided with two permanent openings, ONE IN OR WITHIN 12
INCHES (30.5cm) OF THE ENCLOSURE TOP AND ONE IN OR
WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE BOTTOM.
Each opening shall have a free area of at least one square inch per
1000 Btuh (2,225mm
enclosure, but not less than 100 square inches (645 square cm).
If the conned space is within a building of tight construction, air for
combustion, ventilation, and draft hood dilution must be obtained
from outdoors. When directly communicating with the outdoors
or communicating with the outdoors through vertical ducts, two
permanent openings, located in the above manner, shall be provided.
Each opening shall have a free area of not less than one square inch
per 4000 Btuh (8,900mm
enclosure. If horizontal ducts are used, each opening shall have a
free area of not less than one square inch per 2000 Btuh (4,450mm
Kw) of the total input of all appliances in the enclosure.
2
/kW) of the total input of all appliances in the
2
/kW) of the total input of all appliances in the
VENT REDUCER
The (A)JWSM65250, & (A)JWSM100275 are shipped with an 8”
to 6” diameter ue outlet adapter. Each adapter ts on top of the
installed ue damper. Use only vent reducers supplied with the
unit. The venting must comply with the NATIONAL FUEL GAS
CODE, ANSI Z223.1/NFPA 54.
many local building codes as is the practice of venting gas
red equipment to the duct work of ventilation systems.
• Where a separate vent connection is not available and the vent
pipe from the heater must be connected to a common vent with
an oil burning furnace, the vent pipe should enter the smaller
common vent or chimney at a point above the large vent pipe.
2
/
FIGURE 8
FIGURE 9
MULTIPLE HEATER MANIFOLD
Figure 10 and table 3 should be used for horizontally manifolding
two or more heaters. Also see MULTIPLE-UNIT INSTALLATIONS of
MECHANICAL VENTING section for induced draft applications.
FIGURE 7
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST
BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE
SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
Heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will
retard a free draft.
Type B venting is recommended with these heaters. See table 3
TECHNICAL DATA VENTING.
This water heater must be vented in compliance with all local
codes, the current edition of the National Fuel Gas Code (ANSIZ223.1) or The Natural Gas and Propane Installation Code (CAN/
CSA B149.1) and with the Category I Venting Tables.
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If any parts of the vent system are exposed to ambient
temperatures below 35 degrees F (2 degrees C) they must be
insulated to prevent condensation.
• Do not connect the heater to a common vent or chimney with
solid fuel burning equipment. This practice is prohibited by
This manual provides detailed installation diagrams (see pages
16-22 of this manual) for typical methods of application for the
water heaters.
The water heater may be installed by itself, or with a separate
storage tank, on both single and two-temperature systems.
When used with a separate storage tank, the circulation may
be either by gravity or by means of a circulating pump. When a
circulating pump is used it is important to note that the ow rate
should be slow so that there will be a minimum of turbulence
inside the heater.
WATER LINE CONNECTIONS
FIGURE 10
9
TECHNICAL DATA VENTING, TABLE 3
TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting mutiple tank type heaters using Type B
vent pipe, follow the installation diagram (gure 8) and
tables below which give sizing and data based upon
NFPA 54/ANSI Z223.
MODEL JWSM71120
Input: 120,000 Btuh Total Vent Height (Feet)
Draft Hood: 5”
Input Btuh Rise Vent Connector Diameter (inches)
120,000
120,000
123,000
Number of Heaters
2
3
4
MODEL JWSM95199, JWSM76199, & (A)JWSM100199
Input: 199,000 Btuh Total Vent Height (Feet)
Draft Hood: 6” 6 8 10 15 20 30 50 100
Number of Heaters
2
3
4
Combined Input in
Thousands of Btuh
240 10 8 8 7 7 7 6 7
360 10 10 10 10 8 8 7 7
480 12 12 12 10 10 10 8 8
Input Btuh Rise Vent Connector Diameter (in inches)
199,000
199,000
190,000
197,000
199,000
Combined Input in
Thousands of Btuh
358 10 10 10 10 8 8 7 7
380 12 10 10 10 10 8 7 7
394/398 12 10 10 10 10 8 8 7
537 14 12 12 12 10 10 10 8
570 14 12 12 12 10 10 10 10
591/597 14 14 12 12 12 10 10 10
716 14 14 14 12 12 12 10 10
760 16 14 14 14 12 12 10 10
788/796 16 14 14 14 12 12 12 10
1 Ft. 7 7 7 6 6 6 6 6
2 Ft. 6 6 6 6 6 6 6 5
3 Ft. 6 6 6 6 6 5 5 5
Manifold and Common Vent Diameter (In inches)
Manifold & Common Vent Diameter
6 8 10 15 20 30 50 100
- - 8 8 8 8 8 7
8 8 8 8 7 7 7 7
8 7 7 7 7 7 6 6
8 7 7 7 7 7 7 6
8 8 7 7 7 7 7 6
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10
TECHNICAL DATA VENTING, TABLE 3 (Continued)
MODEL (A)JWSM65251
Input: 251,000 Btuh Total Vent Height (Feet)
Draft Hood: 6”
Input Btuh Rise Vent Connector Diameter (inches)
251,000
251,000
251,000
Number
of Heaters
2
3
4
MODEL (A)JWSM100275
Input: 275,000 Btuh Total Vent Height (Feet)
Draft Hood: 6” 6 8 10 15 20 30 50 100
Number
of Heaters
2 550 - - - 12 10 10 10 10
3 825 - - - 14 14 12 12 12
4 1100 - - - 16 14 14 12 12
MODEL (A)JWSM65305
Input: 305,000 Btuh Total Vent Height (Feet)
Draft Hood: 8”
Number
of Heaters
2
3
4
MODEL (A)JWSM65365, (A)JWSM100390
Input: 365,000, 399,000 Btuh Total Vent Height (Feet)
Draft Hood: 8” 6 8 10 15 20 30 50 100
Number
of Heaters
2
3
4
Combined Input in
Thousands of Btuh
502 14 12 12 10 10 10 8 8
753 14 14 14 12 12 12 10 10
1004 18 16 16 14 14 14 12 12
Input Btuh Rise Vent Connector Diameter (in inches)
275,000
275,000
Combined Input in
Thousands of Btuh
Input Btuh Rise Vent Connector Diameter (inches)
315,000
305,000
365,000
Combined Input in
Thousands of Btuh
610 14 14 12 12 12 10 10 8
915 16 16 16 14 14 12 12 12
1220 18 18 16 16 16 14 14 12
Input Btuh Rise Vent Connector Diameter (in inches)
365,000
400,000
365,000 2 Ft. 12 12 10 10 10 10 10 10
400,000 12 12 12 12 10 10 10 10
365,000 3 Ft. 10 10 10 10 10 10 10 10
400,000 12 10 10 10 10 10 10 10
Combined Input in
Thousands of Btuh
730 14 14 14 12 12 12 10 10
800 16 14 14 14 12 12 10 10
1095 18 18 16 16 14 14 12 12
1200 18 18 18 16 16 14 14 12
1460 20 20 18 18 16 16 14 12
1600 22 20 20 18 18 16 14 14
1 Ft. - - - - - - 8 8
3 Ft. - 8 8 8 - 8 7 7
Manifold and Common Vent Diameter (In inches)
2 Ft. - - - - - 8 8 8
3 Ft. - - - 8 8 8 8 8
Manifold & Common Vent Diameter
1 Ft. - - 10 10 10 10 10 10
2 Ft. 10 10 10 10 10 10 8 8
3 Ft. 10 10 10 10 10 8 8 8
Manifold and Common Vent Diameter (In inches)
1 Ft. - - - - - 10 10 10
Manifold & Common Vent Diameter (inches)
6 8 10 15 20 30 50 100
- - - 8 8 8 8 8
6 8 10 15 20 30 50 100
- - - - - - 10 10
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11
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