American Water Heater High Efficiency Commercial Gas HCG Series AHCG3 119T 300 THRU AHCG3 119T 500 Series 200 201 User Manual

							31
Four Concentric Terminations
1. When installing four concentric terminations through a roof or 
through  a  sidewall  in  close  proximity  they  may  be  arranged 
into stacked rows of two as shown in Figure 30 or lateral rows 
of two as shown in Figure 31.
2.  Four is the maximum number of concentric terminations that 
may  be  installed  in  a  group  where  all  terminations  are  in 
close proximity as shown in Figure 30.
A
A
A = 0 - 2 INCHES (0 - 5 cm)
CLOSE PROXIMITY
CONCENTRIC
TERMINA TION
CAPS END VIEW
FOUR CONCENTRIC  TERMINATIONS(THROUGH  A ROOF OR SIDE WALL)
Figure 30
ABA
FOUR CONCENTRIC  TERMINATIONS(THROUGH  A ROOF OR SIDE WALL)
A = 0 - 2 INCHES (0 - 5 cm)
CLOSE PROXIMITY B = 24 INCHES (61 cm)
OR GREA TER
CONCENTRIC
TERMINA TION
CAPS END VIEW
Figure 31
Groups Of Terminations
1.  When  installing  multiple  groups  of  concentric  terminations 
through  a  roof  or  through  a  sidewall  in  close  proximity  they 
can  be  installed  into  stacked  groups  of  four  as  shown  in 
Figure 32. Lateral groups of four as shown in Figure 31 may 
be  a  more  convenient  installation  arrangement  for  multiple 
groups depending on available space.
A
AB
A = 0 - 2 INCHES (0 - 5 cm)
CLOSE PROXIMITY
CONCENTRIC
TERMINA TION
CAPS END VIEW
EIGHT  CONCENTRIC  TERMINATIONS(THROUGH  A ROOF OR SIDE WALL)
B = 24 INCHES (61 cm)
OR GREA TER BETWEEN
GROUPS OF FOUR
Figure 32
MULTIPLE CONCENTRIC TERMINATION CLEARANCES 
When installing multiple concentric terminations vertically through 
a  roof  or  horizontally  through  a  sidewall  ensure  the  required 
clearances  (separation)  between  terminations  are  maintained. 
Ensure  multiple  terminations  are  arranged  or  grouped  as 
required.
NOTE:  These  clearances  must  be  maintained  to  prevent  the 
recirculation of vent (exhaust) gases to the intake air. Clearances 
are  measured  between  the  edges  of  the  concentric  termination 
caps.
When  installing  multiple  concentric  terminations  through  a  roof 
or  through  a  sidewall  the  clearances  shown  in  Figure  28  must 
be maintained. 
See Multiple Concentric Termination Arrangements on page 31.
Close Proximity & Standard Clearance
1. 
The clearance between multiple termination caps must be 0 
inches (touching) to a maximum of 2 inches (5 cm), dimension 
A - Figure 28, when installing concentric terminations in close 
proximity. See Figure 28 through 32.
2.  The  clearance  between  multiple  termination  caps  must  be 
increased to a minimum of 24 inches (61 cm), dimension B - 
Figure 28, when installation in close proximity (above) is not 
possible. This is the standard clearance.
A
OR
B
A = 0 - 2 INCHES (0 - 5 cm)
CONCENTRIC
TERMINA TION CAPS
END VIEW
TWO CONCENTRIC  TERMINATIONS(THROUGH  A ROOF OR SIDE WALL)
B = 24 INCHES (61 cm)
OR GREA TER
CLOSE PROXIMITY
STANDARD CLEARANCE
Figure 28
Three Concentric Terminations
1.  When installing three concentric terminations through a roof 
or  through  a  sidewall  the  third  termination  may  be  installed 
in close proximity as indicated by dimension A in Figure 29. 
2.  If  close  proximity  installation  of  the  third  termination  is  not 
possible  the  third  termination  may  be  installed  as  indicated 
by dimension B in Figure 29.
A = 0 - 2 INCHES (0 - 5 cm)
CLOSE PROXIMITY
CONCENTRIC
TERMINA TION
CAPS END VIEW
THIRD
TERMINA TION
THREE CONCENTRIC  TERMINATIONS(THROUGH  A ROOF OR SIDE WALL)
A
AB
B = 24 INCHES (61 cm)
OR GREA TER
Figure 29  
						

							32
SIDEWALL
ROOF
Figure 34
Eight Concentric Terminations
Eight  concentric  terminations  may  be  installed  in  two  stacked 
groups  of  four,  in  close  proximity,  as  shown  in  Figure  35.  See 
Figure 32 on page 31 for detailed information on clearances. 
Lateral groups of four as shown in Figure 31 on page 31 may be 
a  more  convenient  installation  arrangement  for  multiple  groups 
depending on available space.
SIDEW ALL
ROOF
Figure 35 
MULTIPLE CONCENTRIC TERMINATION ARRANGEMENTS
The  illustrations  on  this  page  show  some  of  the  installation 
arrangements  for  multiple  concentric  terminations  that  are 
allowed.
See Multiple Concentric Termination Clearances on page 31 for 
detailed  information  on  clearances  and  additional  arrangement 
options.
NOTE:  When  multiple  concentric  terminations  are  installed 
through a roof in the same location all termination caps must be 
at the same height measured from the ground. 
Two Concentric Terminations
Two  concentric  terminations  may  be  installed  in  close 
proximity as shown in Figure 33 or with standard clearances 
when  this  arrangement  is  not  possible.  See  Figure  28 
on  page  31  for  detailed  information  on  clearances.  See 
Figure  29  on  page  31  when  installing  three  concentric 
terminations.
SIDEW ALL
ROOF
Figure 33
Four Concentric Terminations
Four concentric terminations may be installed in close proximity 
as  shown  in  Figure  34.  See  Figure  30  and  Figure  31  on  page 
30  for  detailed  information  on  clearances  and  additional 
arrangement options.  
						

							33
LOW PROFILE VENT INSTALLATION
This water heater is certified for sidewall direct venting with IPEX 
System  636  Low  Profile  Vent  Kit.  Follow  instructions  below  for 
proper installations.
All  termination  kits  must  be  located  and  installed  in  accordance 
with  local  building  code  and  CSA  B149.1  Natural  Gas  and 
Propane Installation Code.
1. Once the proper location has been determined, cut 2 holes in 
the wall large enough to accommodate the pipe. Pipe diameters 
and distance between hole centers can be found in Table 12.
2.  Slide  both  the  intake  and  exhaust  pipes  through  the  holes. 
Solvent cement both pipes to the base of the vent termination 
kit,  follow  the  solvent  cementing  procedures  outlined  in  the 
IPEX System 636 Installation Guide, which is available on the 
web www.ipexinc.com.
3.  To  fasten  the  Base  to  the  wall,  use  the  supplied  screws  and 
anchors. A 3/16” (5mm) hole, 1-3/16” (30mm) deep, will need 
to be drilled for the anchors. Locate the anchor hole using the 
base as a template.
4.  Screw the Cap to the Base using the supplied screws.
5.  Once  the  vent  termination  and  pipes  are  secured,  the  wall 
penetrations  will  need  to  be  sealed  from  the  interior  using  a 
PVC-compatible sealant material.
6.  All  vent  pipes  and  air  inlets  must  terminate  at  the  same 
height to avoid possibility of severe personal injury, death, or 
substantial property damage.
7.  Operate  heater  through  1  heat  cycle  to  ensure  combustion-
air and vent pipes are properly connected to concentric vent 
termination
Figure 36
Figure 37
Figure 38
TABLE 12
Low Profile Termination Kits - Dimensions
AOS Kit Number IPEX Part 
Number DescriptionPipe Outside 
Diameter Hole Spacing
 
(Center to Center)
9008934005 1969864" Flush Mount Vent Kit 4.50"5.63"
9008935005 1960806" Flush Mount Vent Kit 6.61"7.63"
Each Kit Contains
Qty Item Description
1 Base (two holes)
1 Cap (one hole)
8 Stainless Steel Screws
4 Plastic Anchors  
						

							34
VENTING ARRANGEMENTS
Power Vent VerticalFigure 36
Direct Vent Vertical Figure 38 Power Vent Horizontal
Figure 37
Direct Vent Horizontal Figure 39  
						

							35
VENTING ARRANGEMENTS
Direct Vent Vertical Vent Horizontal Intake
Figure 40
Direct Vent Horizontal Vent Vertical Intake
Figure 41
Direct Vent Vertical Concentric
Figure 42
Direct Vent Horizontal Concentric
Figure 43
Direct Vent Horizontal Low Profile
Figure 44  
						

							36
TERMINATION CLEARANCES SIDEWALL POWER VENT
VXVENT TERMINAL AIR SUPPLY INLETA REA WHERE TERMINAL IS NOT PERMITTED
v
v
A G
V
F
IXE DCLOSED
FIXE DCLOSED
OPERABLE OPERABLEV
C
B
B
B
B
F
BV
V
AJ
V
H
M
X XV
VK
B
E
DL
POWER VENT(using room air for combustion)
EXTERIOR CLEARANCES FOR SIDEW ALL VENT TERMINA TION
Figure 45a
Vent terminal clearances for “Power Vent” installations. Power Vent configurations use room air for combustion.
CANADIAN INSTALLATIONS 1US INSTALLATIONS 2CANADIAN INSTALLATIONS 1US INSTALLATIONS 2
AClearance above grade, 
veranda, porch, deck or 
balcony 12 inches (30 cm)
12 inches (30 cm)H
Clearance to each side 
of center line extended 
above meter/regulator  
assembly3 feet (91 cm) within a height 15 feet 
(4.5 m) above the meter/ 
regulator assembly 3 feet (91 cm) within a 
height 15 feet (4.5 m) 
above the meter/regulator 
assembly*
BClearance to window 
or door that may be 
opened6 inches (15 cm) for appliances up to 
10,000 Btu/hr (3 kW), 12 inches (30 
cm) for appliances between 10,000 
Btu/hr (3 kW) and 100,000 Btu/hr (30 
kW), 36 inches (91 cm) for appliances 
above 100,000 Btu/hr (30 kW) 4 feet (1.2 m) below 
or to side of opening; 
1 foot (30 cm) above 
openingIClearance to service 
regulator vent outlet
 
           3 feet (91 cm)
3 feet (91 cm)*
CClearance to 
permanently closed 
window12 inches (30 cm)*
12 inches (30 cm)*J
Clearance to a non 
mechanical air supply 
inlet into building or 
combustion air inlet to 
any other appliance6 inches (15 cm) for appliances up 
to 10,000 Btu/hr (3 kW), 12 inches 
(30 cm) for appliances between 
10,000 Btu/hr (3 kW) and 100,000 
Btu/hr (30kW), 36 inches (91cm) 
for appliances above 100,000 Btu/
hr (30 kW)
4 feet (1.2 m) below or to 
side of opening; 1 foot 
 
(30 cm) above opening.
D
Vertical clearance to 
ventilated soffit located 
above the terminal 
within a horizontal 
distance of 2 feet (61 
cm) from the center line 
of the terminal 12 inches (30 cm)*
12 inches (30 cm)*
KClearance to a 
mechanical air supply 
inlet6 feet (1.83 m) 3 feet (91 cm) above if 
within 
10 feet (3 m) horizontally
EClearance to 
unventilated soffit
12 inches (30 cm)*
12 inches (30 cm)*L
Clearance above paved 
sidewalk or paved 
driveway located on 
public property7 feet (2.13 m)†
7 feet  (2.13 m)
FClearance to outside 
corner2 feet (60 cm)*
2 feet (60 cm)*MClearance under 
veranda, porch, deck, or 
balcony12 inches (30 cm) ‡
12 inches (30 cm) ‡
GClearance to inside 
corner18 inches (45 cm)*
18 inches (45 cm)*
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.  
Where it may cause hazardous frost or ice accumulations on adjacent property surfaces.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor .
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer ’s installation instructions.  
						

							37
TERMINATION CLEARANCES SIDEWALL DIRECT VENT
VXVENT TERMINAL AIR SUPPLY INLETA REA WHERE TERMINAL IS NOT PERMITTED
v
v
A G
V
F
IXE DCLOSED
FIXE DCLOSED
OPERABLE OPERABLEV
C
B
B
B
B
F
BV
V
AJ
V
H
M
X XV
VK
B
E
DL
DIRECT VENT(using outdoor air for combustion)
EXTERIOR CLEARANCES FOR SIDEW ALL VENT TERMINA TION
Figure 45b
Vent terminal clearances for “Direct Vent” installations. Direct Vent configurations use outdoor air for combustion.
CANADIAN INSTALLATIONS 1US INSTALLATIONS 2CANADIAN INSTALLATIONS 1US INSTALLATIONS 2
AClearance above grade, 
veranda, porch, deck or 
balcony 12 inches (30 cm)
12 inches (30 cm)H
Clearance to each side 
of center line extended 
above meter/regulator 
assembly3 feet (91 cm) within a height 15 
feet (4.5 m) above the meter/ 
regulator assembly
3 feet (91 cm) within a height 
15 feet (4.5 m) above the 
meter/regulator assembly*
BClearance to window or 
door that may be opened6 inches (15 cm) for appliances 
up to 10,000 Btu/hr (3 kW), 12 
inches (30 cm) for appliances 
between 10,000 Btu/hr (3 kW) 
and 100,000 Btu/hr (30 kW), 36 
inches (91 cm) for appliances 
above 100,000 Btu/hr (30 kW) 6 inches (15 cm) 
for appliances up to 
10,000 Btu/hr (3 kW), 
9 inches (23 cm) for 
appliances between 
10,000 Btu/hr (3 kW) 
and 50,000 Btu/hr (15 
kW), 12 inches (30 cm) 
for appliances above 
50,000 Btu/hr (15 kW)IClearance to service 
regulator vent outlet
3 feet (91 cm)
3 feet (91 cm)*
CClearance to 
permanently closed 
window6 inches (15 cm)*
6 inches (15 cm)*J
Clearance to a non 
mechanical air supply 
inlet into building or 
combustion air inlet to 
any other appliance6 inches (15 cm) for appliances up 
to 10,000 Btu/hr (3 kW), 12 inches  
(30 cm) for appliances between 
10,000 Btu/hr (3 kW) and 100,000 
Btu/hr (30 kW), 36 inches (91 cm)  
for appliances above 100,000 Btu/
hr (30 kW) 6 inches (15 cm) for 
appliances up to 10,000 
Btu/hr (3 kW), 9 inches (23 
cm) for appliances between 
10,000 Btu/hr (3 kW) and 
50,000 Btu/hr (15 kW), 12 
inches (30 cm) for appliances 
above 50,000 Btu/hr (15 kW)
D
Vertical clearance to 
ventilated soffit located 
above the terminal within 
a horizontal distance of 
2 feet (61 cm) from the 
center line of the terminal
12 inches (30 cm)*
12 inches (30 cm)*
KClearance to a 
mechanical air supply 
inlet6 feet (1.83 m)
3 feet (91 cm) above if within 
10 feet (3 m) horizontally
EClearance to unventilated 
soffit12 inches (30 cm)*
12 inches (30 cm)*L
Clearance above 
paved sidewalk or 
paved driveway located 
on public property7 feet (2.13 m)†
7 feet (2.13 m)†*
FClearance to outside 
corner2 feet (60 cm)*
2 feet (60 cm)*MClearance under 
veranda, porch, deck, 
or balcony12 inches (30 cm) ‡
12 inches (30 cm) ‡*
GClearance to inside 
corner18 inches (45 cm)*
18 inches (45 cm)*
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.  
Where it may cause hazardous frost or ice accumulations on adjacent property surfaces.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor .
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer ’s installation instructions.  
						

							38
3. Do not install an additional trap in the condensate drain piping.  
DO NOT remove, modify or alter the factory condensate trap.
INSTALLATION INSTRUCTIONS
1.  Ensure  the  water  heater’s  Enable/Disable  switch  is  in  the 
“Disable” position.
2.  Install  a  1/2  inch  PVC  condensate  drain  line  between  the 
condensate  drain  connection  on  the  Exhaust/Condensate 
Elbow and a suitable building drain. The exhaust elbow has 
a "built in" condensate trap. Do not install  an additional  trap 
in the condensate drain piping, Figure 46.
3.  Terminate the condensate drain piping with an elbow above 
the drain. Ensure that any discharge will exit the condensate 
drain line no more than 6 inches (15.2 cm) above a suitable 
building drain, or external to the building, see Figure 46.
NOTE:  In  cold  climates  it  is  recommended  the  condensate 
drain be terminated at a suitable drain inside the building.
4.  Ensure  the  condensate  drain  line  is  not  elevated  above  the 
condensate  drain  connection  on  the  exhaust/condensate 
elbow, see Figure 46.
5.  Brace the condensate drain line with floor mounted standoffs 
every three feet.
6.  Ensure  the  condensate  drains  freely  during  start  up,  see 
Start Up on page 52.
7.  Condensate clean out cap must be on and tight when unit is 
in operation.
WATER HEATER INSTALLATION
CONDENSATE DRAIN INSTALLATION
Installation  must  conform  with  these  instructions  and  local 
building codes.
Condensate neutralizer kits are available. Contact your distributor 
or Service Agency.
Field supplied materials required for installation include:
• Approved PVC cement and PVC primer.
•  1/2  inch  PVC  pipe  -  minimum  length  to  equal  the  distance  
between the water heater and a suitable building drain.
•  1/2  inch  PVC  fittings  (elbows,  couplings  and  adapters) 
necessary  to  install  a  condensate  drain  line  between  the 
exhaust/condensate elbow assembly and a suitable building 
drain.
•  Floor mounted standoffs to brace the drain line.
INSTALLATION NOTES
1.  The  condensate  drains  from  the  water  heater’s  covered  by 
this  instruction  have  PH  levels  between  4.3  and  5.0.  Install 
a  commercially  available  neutralizing  kit  if  required  by  local 
codes.  Lower  PH  levels  are  acidic.  Do  not  connect  a  metal 
condensate  drain  line,  such  as  copper  pipe,  to  the  water 
heater for this reason.
2.  The  field  installed  condensate  drain  line  must  not  be  less 
than  1/2  inch  PVC  in  size.  The  condensate  line  must  slope 
to an open drain.
CONDENSA TE DRAIN
LINE - FIELD INST ALLED
DRAIN LINE  TO
TERMINA TE NO
MORE  THAN 6
INCHES (15.2 cm)
ABOVE DRAIN
BUILDING
DRAIN
1/2” NPT
CONDENSA
TE
DRAIN
CONNECTION
CONDENSATE
CLEANOUT
EXHAUST/CONDENSA
TE
(VENT) ELBOW
PRESSURE POR T
Figure 46  
						

							39
SUPPLY GAS LINE INSTALLATION
Contact  your  local  gas  utility  company  to  ensure  that  adequate 
gas  service  is  available  and  to  review  applicable  installation 
codes for your area.
Be sure that the gas meter has sufficient capacity to supply the 
rated  gas  input  of  the  water  heater  as  well  as  the  requirements 
of  all  other  gas  fired  equipment  supplied  by  the  meter.  If  the 
gas  meter  is  undersized,  the  gas  company  will  have  to  install  a 
properly sized gas meter.
Fire and Explosion Hazard
Turn of f gas lines during installation.
Contact a qualified installer or servic e
agency for installation and service.
Excessive gas pressure to gas valve ca n
cause serious injury or death. Do not use water heater with any gas
other than the gas shown on the rating
label.  
Make sure gas supplied is same type listed on the water heater’s 
rating label.
The  water  heaters  covered  in  this  manual  are  not  intended  for 
operation  at  higher  than  14.0”  W.  C.  (2.49  kPa)  for  natural  and 
propane gas supply pressure, see Table 4 on page 10. The water 
heaters covered in this manual require supply gas regulators to 
maintain  required  supply  gas  pressure.  Exposure  to  higher  gas 
supply  pressure  may  cause  damage  to  the  gas  controls  which 
could  result  in  fire  or  explosion.  If  overpressure  has  occurred 
such  as  through  improper  testing  of  gas  lines  or  malfunction  of 
the supply system the water heater’s gas valve must be checked 
for safe operation by a Qualified Service Agency. 
Ensure supply regulator vent lines and the safety vent valves are 
protected  against  blockage.  These  are  components  of  the  gas 
supply  system,  not  the  water  heater.  Vent  blockage  may  occur 
during ice storms.
It  is  important  to  guard  against  gas  valve  fouling  from 
contaminants in the gas ways. Such fouling may cause improper 
operation, fire or explosion. If copper supply lines are used they 
must be internally tinned and certified for gas service.
REGULA TED GAS
SUPPL Y LINE
MAIN GAS
SHUT OFF VA LVE
TEE FITTING
PIPE CAP SEDIMENT  TRAP
Figure 47
Ensure all gas pipe is clean on the inside before installation. To 
trap any dirt or foreign material in the gas supply line a sediment 
trap must be installed as shown in Figure 47. The sediment trap 
must be readily accessible and not subject to freezing conditions. 
Install in accordance with the recommendations of the local gas 
utility company. GAS LINE SIZING
Minimum required supply gas line sizes are shown in Table 5 on 
page  10.  Depending  on  the  developed  equivalent  length  and/or 
the number of appliances connected to a common main, the size 
of supply gas lines may have to be increased.
Size  the  supply/main  gas  line(s)  in  accordance  with  Table  13 
or  Table  14.  The  values    given  in  Table  13  and  Table  14  are  for 
straight lengths of iron pipe at 0.5" W. C. (125 Pa) pressure drop, 
which  is  considered  normal  for  low  pressure  systems.  Note  that 
fittings such as elbows and tees will add to the pipe pressure drop.
Schedule 40 Steel or Wrought Iron Pipe is the preferred material 
for the gas line of this water heater. It is imperative to follow the 
sizing recommendations in the latest version of the National Fuel 
Gas  Code  if  Corrugated  Stainless  Steel Tubing  (CSST)  is  used 
as the gas line for this water heater.
SUPPLY GAS LINE SIZING U. S. UNITS
TABLE 13
LENGTH
IN
FEET NORMAL  IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS BTU/HR
1 1/4” 1 1/2” 2”2 1/2” 3”4”
10 140021003960630011000 23000
20 9501460 27504360770015800
30 7701180 2200 3520625012800
40 6609901900 3000530010900
50 5809001680 265047509700
60 5308101520 240043008800
70 4907501400 225039008100
80 4606901300 205037007500
90 4306501220 195034507200
100 4006201150 1850 32506700
125 3605501020 165029506000
150 3255009501500 26505500
175 3004608501370 24505000
200 N/A430 8001280 22804600
SUPPLY GAS LINE SIZING METRIC UNITS
TABLE 14
LENGTH IN
METERS NORMAL  IRON PIPE SIZES (INCHES)
INPUT IN kW
1 1/4” 1 1/2” 2”2 1/2” 3”4”
3.0 4106151160 1845 32216735
6.1 2784288051277 22554626
9.1 2253466441031 18303748
12.2 1932905568781552 3192
15.2 1702644927761391 2840
18.3 1552374457031259 2577
21.3 1432204106591142 2372
24.4 1352023816001083 2196
27.4 1261903575711010 2108
30.5 11 7182 3375429521962
38.1 1051612994838641757
45.7 95146 2784397761610
53.3 88135 2494017171464
61.0 N/A126 2343756881347  
						

							40
GAS LINE CONNECTION
1. The water heaters covered by this manual are shipped from 
the  factory  with  a  1  1/2”  supply  gas  connection,  see Table  1 
on page 10. Connect the supply gas line to the water heater's 
24 VAC Gas Valve in accordance with all applicable local and 
national code requirements, see Figure 48.
2.  (A)HCG3  119T500  natural  gas  models  require  a  1  1/2” 
minimum supply gas line. All other water heaters covered by 
this  manual  require  a  1  1/4”  minimum  supply  gas  line.  See 
Table 5 on page 10.
3.  Apply  thread  sealing  compounds  (pipe  dope/  Teflon  tape) 
sparingly and only to the male threads of the pipe joints. Do 
not apply sealing compound to the first two threads. Use pipe 
dope or Teflon tape marked as being resistant to the action of 
liquid petroleum (LP/propane) gases.
4.  Use  only  a  smooth  jaw  adjustable  wrench  (such  as  a 
monkey  wrench)  as  a  back  up  on  the  body  of  the  24  VAC 
Gas Valve when tightening the first pipe nipple into the body 
of the valve.  DO NOT use a standard pipe wrench (Stillson 
wrench)  with  metal  tooth  jaws  as  this  may  permanently 
damage the valve.
5.  Use  a  standard  pipe  wrench  (Stillson  wrench)  as  a  back 
up  on  the  first  pipe  nipple  installed  above  when  connecting 
other  fittings  and  pipe  in  the  supply  gas  line  to  prevent  the 
24  VAC  Gas  Valve  on  the  water  heater  from  twisting  during 
installation.
6.  To  prevent  damage,  care  must  be  taken  not  to  apply  too 
much  torque  when  connecting  the  supply  gas  line  to  the 
water heater. 
7.  Install a sediment trap as shown in Figure 47 on page 39.
8.  Install  a  Main  Gas  Shutoff  valve  in  the  supply  gas  line  as 
shown in Figure 47 on page 39.
NOTE:  Should  overheating  occur  or  the  gas  supply  fail  to  shut 
off, turn off the Main Gas Shutoff valve to the water heater.
Gas Line
Connection
Figure 48
GAS LINE LEAK TESTING
Fire and Explosion Hazar d
Leak test gas connections
before placing the water heater
in operation.
Disconnect gas piping at main
gas shutoff valve before lea k
testing heate r.
Install sediment trap in accordanc e
with NFPA  54 or CAN/CSA  149.1.
Use joint compound or  Teflon tape
compatible with propane gas .
Any time work is done on the gas supply system perform a leak 
test to avoid the possibility of fire or explosion.
1. For  test  pressures  exceeding  1/2  psi  (3.45  kPa)  disconnect 
the water heater and its Main Gas Shutoff Valve from the gas 
supply  piping  system  during  testing,  see  Figure  47  on  page 
39. The gas supply line must be capped when disconnected 
from the water heater.
2.  For  test  pressures  of  1/2  psi  (3.45  kpa)  or  less,  the  water 
heater  need  not  be  disconnected,  but  must  be  isolated  from 
the  supply  gas  line  by  closing  the  Main  Gas  Shutoff  Valve 
during testing.
3.  Paint all supply gas line joints and connections upstream 
of    the  water  heater  with  a  rich  soap  and  water  solution 
to test for leaks. Bubbles indicate a gas leak. Do not use 
matches,  candles,  flame  or  other  sources  of  ignition  for 
this purpose. 
4.  Repair any leaks before placing the water heater in operation.
PURGING
Gas line purging is required with new piping or systems in which 
air  has  entered.  Purging  should  be  performed  per  the  current 
edition of NFPA 54 the National Fuel Gas Code.
ELECTRICAL WIRING
All  electrical  work  must  be  installed  in  accordance  with  the 
National  Electrical  Code,  ANSI/NFPA  70  or  the  Canadian 
Electrical Code, CSA C22.1 and local requirements.
When  installed,  the  water  heater  must  be  electrically  grounded 
in accordance with local codes or, in the absence of local codes, 
with the National Electrical Code, ANSI/NFPA 70 or the Canadian 
Electrical Code, CSA C22.1.
If any of the original wire as supplied with the water heater must 
be  replaced,  it  must  be  replaced  with  105°C  rated  wiring  or  its 
equivalent,  except  in  the  burner  housing.  In  this  case  200°C 
rated wire must be used.
DEDICATED POWER WIRING AND BREAKERS
Dedicated  power  supply  wires,  ground  wiring  and  dedicated 
circuit  breakers  often  prevent  electrical  line  noise  and  are 
required when installing the water heater.
POWER SUPPLY CONNECTIONS
Read the requirements for the Power Supply on page 13 before 
connecting power.
The  120  VAC  hot  wire  from  the  power  supply  must  connect  to  the 
black  jumper  wire  or  the  "L1"  terminal  block  location  in  the  junction 
box and the 120 VAC neutral wire must connect to the white jumper 
wire  or  the  "Neutral"  terminal  block  location  in  the  junction  box  for 
correct polarity. See Figure 49.
Power supply connections must be made as follows: 
1. Turn  off  power  at  the  water  heater's  enable/disable  switch  and 
the breaker that supplies power to the water heater.
2.  Remove  the  junction  box  cover.  See  Figure  3  on  page  8  for 
junction box location. 
3.  Connect the 120VAC hot wire from the power supply to the black 
jumper wire or the terminal block location marked "L1" inside of 
the  junction  box  located  on  top  of  the  water  heater.  If  the  black 
jumper wire is used, make the connection inside of the junction 
box with a properly sized wire nut and wrap electrical tape around 
the wire nut and wire end. See junction box Figure 41 and wiring 
diagram Figure 58 on page 66.
4.  Connect the 120VAC neutral wire from the power supply to the 
white jumper wire or the terminal block location marked "Neutral" 
inside  of  the  junction  box  located  on  top  of  the  water  heater.  If 
the white jumper wire is used, make the connection inside of the 
junction  box  with  a  properly  sized  wire  nut  and  wrap  electrical 
tape around the wire nut and wire end. See junction box Figure 
on page 41 and wiring diagram Figure 58 on page 66.