A.O. Smith BTH 300 User manual

COMMERCIAL GAS WATER HEATERS
Instruction Manual
PRINTED 1216 100233746
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
7KDQN\RXIRUEX\LQJWKLVHQHUJ\HI¿FLHQWZDWHUKHDWHU
:HDSSUHFLDWH\RXUFRQ¿GHQFHLQRXUSURGXFWV
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.
MODELS
BTH 300(A)/400(A)/500(A)
SERIES 300 & 301
INSTALLATION - OPERATION - SERVICE
- MAINTENANCE - LIMITED WARRANTY
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do
not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
If you cannot reach your gas supplier,
call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
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ANSI/NSF-5
LOW LEAD
CONTENT
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www.hotwater.com

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3RZHU9HQW,QVWDOODWLRQ 23
'LUHFW9HQW,QVWDOODWLRQ 23
'LUHFW9HQW$LU,QWDNH0RLVWXUH3URWHFWLRQ 24
9HUWLFDO7HUPLQDWLRQ,QVWDOODWLRQ 24
6LGHZDOO7HUPLQDWLRQ,QVWDOODWLRQ 26
Polypropylene Installations 27
$/&9HQW,QVWDOODWLRQV 28
&RQFHQWULF7HUPLQDWLRQ,QVWDOODWLRQ 29
,QFK&RQFHQWULF7HUPLQDWLRQ,QVWDOODWLRQ 30
/RZ3UR¿OH9HQW,QVWDOODWLRQ 33
9HQWLQJ$UUDQJHPHQWV 34
7HUPLQDWLRQ&OHDUDQFHV6LGHZDOO3RZHU9HQW 36
7HUPLQDWLRQ&OHDUDQFHV6LGHZDOO'LUHFW9HQW 37
WATER HEATER INSTALLATION 38
&RQGHQVDWH'UDLQ,QVWDOODWLRQ 38
Supply Gas Line Installation 39
Gas Line Leak Testing 40
Purging 40
(OHFWULFDO:LULQJ 40
(QDEOH'LVDEOH&LUFXLW
)RU%XLOGLQJ0DQDJHPHQW6\VWHPV 41
:DWHU/LQH&RQQHFWLRQV 41
739DOYH'LVFKDUJH3LSH 42
7(03(5$785(5(*8/$7,21 43
+LJK7HPSHUDWXUH/LPLW&RQWURO(&2 43
7KHUPRVWDW&RQWURO 43
&21752/6<67(023(5$7,21 44
2YHUYLHZ 44
&RQWURO6\VWHP1DYLJDWLRQ 44
8VHU6HWWLQJV&RQWURO6\VWHP0HQXV 47
67$5783 52
Prior to Start up 52
Lighting & Operation Label 53
&KHFNLQJWKH)LULQJ5DWH 54
+LJK$OWLWXGH,QVWDOODWLRQV 55
7528%/(6+227,1* 56
,QVWDOODWLRQ&KHFNOLVW 56
6HTXHQFHRI2SHUDWLRQ 56
6HTXHQFHRI2SHUDWLRQ)ORZ&KDUW 57
2SHUDWLRQDO3UREOHPV 58
)DXOWDQG$OHUW&RQGLWLRQV 59
0$,17(1$1&( 62
General 62
0DLQWHQDQFH6FKHGXOH 62
'UDLQLQJDQG)OXVKLQJ 62
Filling the Water Heater 63
6HGLPHQW5HPRYDO 63
/LPH6FDOH5HPRYDO 63
3RZHUHG$QRGH5RGV 64
'UDLQ9DOYHDQG$FFHVV3DQHOV 64
7HPSHUDWXUH3UHVVXUH5HOLHI9DOYH7HVW 64
9HQW6\VWHP 64
',$*5$06 65
&&%&HQWUDO&RQWURO%RDUG/D\RXW 65
:LULQJ'LDJUDP 66
&LUFXODWLRQ3XPS:LULQJ'LDJUDPV 67
:DWHU3LSLQJ'LDJUDPV 68
/,0,7(':$55$17< 75
6$)(,167$//$7,2186($1'6(59,&( 3
$33529$/6 3
*(1(5$/6$)(7<,1)250$7,21 4
3UHFDXWLRQV 4
*URXQGLQJ,QVWUXFWLRQV 4
+\GURJHQ*DV)ODPPDEOH 4
,1752'8&7,21 6
$EEUHYLDWLRQV8VHG 6
4XDOL¿FDWLRQV 6
L&200%$&QHW&RPSDWLEOH 6
Preparing for the Installation 6
)($785(6$1'&20321(176 7
%DVLF2SHUDWLRQ 7
0RGXODWLRQ 7
%ORZHU%XUQHU$VVHPEO\'HWDLO 7
7RS9LHZ 8
6LGH9LHZV 9
,167$//$7,21&216,'(5$7,216 10
5RXJK,Q'LPHQVLRQV 10
*DV/LQH&RQQHFWLRQ6L]H 10
6WRUDJH&DSDFLWLHV 10
5HFRYHU\&DSDFLWLHV 10
*DV3UHVVXUH5HTXLUHPHQWV 10
0LQLPXP6XSSO\*DV/LQH6L]H 10
/RFDWLQJWKH:DWHU+HDWHU 11
([WHQGHG9HQW7HUPLQDWLRQV 11
2SWLRQDO'LUHFW9HQW7HUPLQDWLRQV 12
+DUG:DWHU 12
&LUFXODWLRQ3XPSV 12
Insulation Blankets 12
,167$//$7,215(48,5(0(176 13
*DV6XSSO\6\VWHPV 13
Supply Gas Regulator 13
3RZHU6XSSO\ 13
0L[LQJ9DOYHV 14
'LVKZDVKLQJ0DFKLQHV 14
&ORVHG:DWHU6\VWHPV 14
7KHUPDO([SDQVLRQ 14
7HPSHUDWXUH3UHVVXUH5HOLHI9DOYH 15
&RQGHQVDWH'UDLQ 16
&RPEXVWLEOH0DWHULDO6WRUDJH 16
&RQWDPLQDWHG$LU 16
$LU5HTXLUHPHQWV 17
8QFRQ¿QHG6SDFH 17
&RQ¿QHG6SDFH 17
)UHVK$LU2SHQLQJV)RU&RQ¿QHG6SDFHV 18
2XWGRRU$LU7KURXJK7ZR2SHQLQJV 18
2XWGRRU$LU7KURXJK2QH2SHQLQJ 18
2XWGRRU$LU7KURXJK7ZR+RUL]RQWDO'XFWV 18
2XWGRRU$LU7KURXJK7ZR9HUWLFDO'XFWV 19
$LU)URP2WKHU,QGRRU6SDFHV 19
,167$//$7,21 5(48,5(0(176  &20021:($/7+ 2)
0$66$&+86(776 20
9(17,1*,167$//$7,21 21
*HQHUDO9HQWLQJ,QIRUPDWLRQ 21
*HQHUDO9HQWLQJ,QVWUXFWLRQV 21
9HQWLQJ5HTXLUHPHQWV 22
9HQWLQJ,QVWDOODWLRQ6HTXHQFH 23
TABLE OF CONTENTS

3
SAFE INSTALLATION, USE AND SERVICE
7KHSURSHULQVWDOODWLRQXVHDQGVHUYLFLQJRIWKLVZDWHUKHDWHULVH[WUHPHO\LPSRUWDQWWR\RXUVDIHW\DQGWKHVDIHW\RIRWKHUV
0DQ\VDIHW\UHODWHGPHVVDJHVDQGLQVWUXFWLRQVKDYHEHHQSURYLGHGLQWKLVPDQXDODQGRQ\RXURZQZDWHUKHDWHUWRZDUQ\RXDQG
RWKHUVRIDSRWHQWLDOLQMXU\KD]DUG5HDGDQGREH\DOOVDIHW\PHVVDJHVDQGLQVWUXFWLRQVWKURXJKRXWWKLVPDQXDO,WLVYHU\LPSRUWDQW
WKDWWKHPHDQLQJRIHDFKVDIHW\PHVVDJHLVXQGHUVWRRGE\\RXDQGRWKHUVZKRLQVWDOOXVHRUVHUYLFHWKLVZDWHUKHDWHU
$OOVDIHW\PHVVDJHVZLOOJHQHUDOO\WHOO\RXDERXWWKHW\SHRIKD]DUGZKDWFDQKDSSHQLI\RXGRQRWIROORZWKHVDIHW\PHVVDJHDQG
KRZWRDYRLGWKHULVNRILQMXU\
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
ANSI/NSF-5
LOW LEAD
CONTENT
NOTE:$60(FRQVWUXFWLRQLVRSWLRQDORQWKHZDWHUKHDWHUVFRYHUHGLQWKLVPDQXDO

4
PRECAUTIONS
'2 127 86(7+,6$33/,$1&( ,)$1< 3$57 +$6 %((1
(;326('72)/22',1*25:$7(5'$0$*(,PPHGLDWHO\
FDOODTXDOL¿HGVHUYLFHDJHQF\WRLQVSHFWWKHDSSOLDQFHDQGWR
PDNHDGHWHUPLQDWLRQRQZKDWVWHSVVKRXOGEHWDNHQQH[W
,IWKHXQLWLVH[SRVHGWRWKHIROORZLQJGRQRWRSHUDWHKHDWHU
XQWLO DOO FRUUHFWLYH VWHSV KDYH EHHQ PDGH E\ D TXDOLILHG
VHUYLFHDJHQF\
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 'DPDJH
 )LULQJZLWKRXWZDWHU
GROUNDING INSTRUCTIONS
7KLV ZDWHU KHDWHU PXVW EH JURXQGHG LQ DFFRUGDQFH ZLWK WKH
1DWLRQDO(OHFWULFDO&RGHDQGRUORFDOFRGHV7KHVHFRGHVPXVW
EH IROORZHG LQ DOO FDVHV )DLOXUH WR JURXQG WKLV ZDWHU KHDWHU
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7KLV ZDWHU KHDWHU PXVW EH FRQQHFWHG WR D JURXQGHG PHWDO
SHUPDQHQWZLULQJV\VWHPRUDQHTXLSPHQWJURXQGLQJFRQGXFWRU
PXVW EH UXQ ZLWK WKH FLUFXLW FRQGXFWRUV DQG FRQQHFWHG WR WKH
HTXLSPHQWJURXQGLQJWHUPLQDORUOHDGRQWKHZDWHUKHDWHU
HYDROGEN GAS FLAMMABLE
+\GURJHQ JDV FDQ EH SURGXFHG LQ D KRW ZDWHU V\VWHP VHUYHG
E\WKLVZDWHUKHDWHUWKDWKDVQRWEHHQXVHGIRUDORQJSHULRGRI
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GENERAL SAFETY INFORMATION
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
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.

5
GENERAL SAFETY INFORMATION
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 label.
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
Turn off gas lines during installation.
Contact a qualified installer or service
agency for installation and service.
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
label.
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 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 heater.
Install sediment trap in accordance
with NFPA 54 or CAN/CSA 149.1.
Use joint compound or Teflon tape
compatible with propane gas.
Turn off power at the branch circuit
breaker serving 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.
•
Jumping out control circuits or components can
result in property damage, personal injury or death.
Service should only be performed by a qualified service
technician using proper test equipment.
•
Altering the water heater controls and/or wiring in any way
could result in permanent damage to the controls or water
heater and is not covered under the limited warranty.
•
Any bypass or alteration of the water
heater controls and/or wiring will result
in voiding the appliance warranty.

6
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Figure 1
FEATURES AND COMPONENTS
MODULATION
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BLOWER/BURNER ASSEMBLY DETAIL
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MAIN BURNER
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Spark Electrode
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8
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TOP VIEW
COMPONENTS (All Models)
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Figure 4 Figure 5
10
11
13
14
12
16
3
5
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2
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6
9
LEFT SIDE
18
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1
2
4
6
16
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RIGHT SIDE

10
GAS
INTAKE
CLEANOUT
T&P
DRAIN
EXHAUST
1 1/2" NPT
WATER
OUTLET
FRONT
18°
30°
45°
42°
70°
20°
TOP
RECIRC RETURN
CLEANOUT
3/4" NPT
T&P
3/4" NPT DRAIN 1 1/2" NPT
WATER INLET
52in
132.08cm
32.39cm
12-3/4in
4-3/4in
12.07cm
58.43cm
23in
75-3/4in
192.41cm
FRONT
4" EXHAUST VENT
CONNECTION
CONNECTION
1 1/2" SUPPLY GAS
BACK
4" PVC AIR INTAKE
CONNECTION
74-1/2 in
33-1/8 in
189.23cm
84.12cm
O.D.
69-1/4in
175.9cm
63-1/8in
160.35cm
WATER
OUTLET
HEIGHT
Figure 6
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STORAGE CAPACITIES
TABLE 2
0RGHO 86*DOORQV Liters
$60( 6WDQGDUG $60( 6WDQGDUG
All 119 119  
ROUGH IN DIMENSIONS
GAS LINE CONNECTION SIZE
TABLE 1
02'(/ SERIES 1$785$/*$6 PROPANE GAS
BTH 300 300/301 ´137 ´137
BTH 400 300/301 ´137 ´137
BTH 500 300/301 ´137 ´137
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RECOVERY CAPACITIES
TABLE 3 U.S. GALLONS/HR & LITERS/HR AT TEMPERATURE RISE INDICATED
0RGHO Type of
Gas Input 7KHUPDO (I¿FLHQF\
°F 30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
Btu/hr kW & & & & & & & & & & & & &
BTH 300 Natural  88 96 GPH 1164 873 698 582 499 436 388 349 317 291 269 249
Propane LPH 4404 3303 2643 2202 1888 1652 1468 1321 1201 1101 1016 944
BTH 400 Natural  117 95 GPH 1535 1151 921 767 658 576 512 460 419 384 354 329
Propane LPH 5810 4357 3486 2905 2490 2179 1937 1743 1585 1452 1341 1245
BTH 500 Natural  146 95 GPH 1919 1439 1151 959 822 720 640 576 523 480 443 411
Propane LPH 7263 5447 4358 3631 3113 2724 2421 2179 1981 1816 1676 1556
GAS PRESSURE REQUIREMENTS
TABLE 4
02'(/ 0$1,)2/'35(6685( 0,1,0806833/<35(6685( 0$;,0806833/<35(6685(
1$785$/*$6 PROPANE GAS 1$785$/*$6 PROPANE GAS 1$785$/*$6 PROPANE GAS
BTH 300 ´:&N3D ´:&N3D :&N3D ´:&N3D ´:&N3D ´:&N3D
BTH 400 ´:&N3D ´:&N3D :&N3D ´:&N3D ´:&N3D ´:&N3D
BTH 500 ´:&N3D ´:&N3D :&N3D ´:&N3D ´:&N3D ´:&N3D
* The manifold pressure is the factory setting and is not adjustable. $QHJDWLYHSUHVVXUHZLOOEHVHHQZLWKMXVWWKHEORZHUUXQQLQJZLWKRXWWKH*DV&RQWURO9DOYHRSHQ
MINIMUM SUPPLY GAS LINE SIZE
TABLE 5
02'(/ 1$785$/*$6 PROPANE GAS
BTH 300 1 1/4" NPT 1 1/4" NPT
BTH 400 1 1/4" NPT 1 1/4" NPT
†BTH 500 1 1/2" NPT 1 1/4" NPT
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INSTALLATION CONSIDERATIONS

11
LOCATING THE WATER HEATER
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Property Damage Hazard
All water heaters eventually leak.
•
Do not install without adequate drainage.
•
CAUTION
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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 label.
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.
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0
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FRONT VIEW
CLEARANCES TO COMBUSTIBLE
AND NON COMBUSTIBLE
CONSTRUCTION MATERIALS
WATER
HEATER
FRONT
TOP COVER
FRONT
Figure 7
SERVICE CLEARANCE
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12
INSULATION BLANKETS
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
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SUPPLY GAS REGULATOR
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INSTALLATION REQUIREMENTS

14
HOT WATER
OUTLET
TO TANK
INLET
CHECK
VALVE
MIXING
VALVE
COLD
WATER
INLET
TEMPERED WATER
OUTLET
12” TO 15”
(30-38 cm)
CHECK
VALVE
Figure 8
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CLOSED WATER SYSTEMS
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MIXING VALVES
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.
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TABLE 6
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 PLQXWH PLQXWHV
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 VHFRQGV VHFRQGV
 VHFRQG VHFRQGV
 instantaneous VHFRQG
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DISHWASHING MACHINES
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15
Water Damage Hazard
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
•
CAUTION
T&P Valve Discharge Pipe Requirements:
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• 6KDOOQRWEHSOXJJHGRUEORFNHG
• 6KDOOQRWEHH[SRVHGWRIUHH]LQJWHPSHUDWXUHV
• 6KDOOEHRIPDWHULDOOLVWHGIRUKRWZDWHUGLVWULEXWLRQ
• 6KDOOEHLQVWDOOHGVRDVWRDOORZFRPSOHWHGUDLQDJHRIERWK
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SLSH
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COMBUSTIBLE MATERIAL STORAGE
Fire or Explosion Hazard
Read instruction manual before
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Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
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Keep ignition sources away from faucets after extended
periods of non-use.
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Do not expose water heater controls to excessive gas
pressure.
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19
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