American Water Heater 98 Gallon 80 Thermal Efficiency UltraLow NOx Heavy Duty Commercial Gas Water Heater User Manual

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WATER PIPING
WATER (POTABLE) HEATING AND SPACE HEATING
This	water	 heater	 shall	not	be	connected	 to	any	 heating	 systems 	
or	 component(s)	 used	with	a	non-potable	 water	heating	 appliance.
All	 piping	 components	 connected	to	this	 unit	 for	space	 heating 	
applications	shall	be	suitable	for	use	with	potable	water.
Toxic	 chemicals,	 such	as	those	 used	for	boiler	 treatment 	shall	 not	
be	introduced	into	this	system.
When	 the	system	 requires	 water	for	space	 heating	 at	temperatures...

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NOTE:	In	addition	 to	the	 factory	 installed	 Temperature-Pressure 	
Relief	 Valve	on	the	 water	 heater,	 each	remote	 storage	 tank	that	
may	 be	installed	 and	piped	 to	a	water	 heating	 appliance	 must	also	
have	 its	own	 properly	 sized,	rated	 and	approved	 Temperature-
Pressure	 Relief	Valve	installed.	 Call	the	toll	free	 technical	 support	
phone	 number	 listed	on	the	 back	 cover	 of	this	 manual	 for	technical 	
assistance	 in	sizing	 a	Temperature-Pressure	 Relief	Valve	 for	remote...

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amount	of	combustion	 air	can	 result	 in	a	fire	 or	explosion	 and	cause	 property 	
damage,	serious	bodily	injury	or	death.
UNCONFINED SPACE
An	 Unconfined	 Space	is	one	 whose	 volume	 is	not	 less	 than	 50	
cubic	 feet	per	1,000	 Btu/hr	 (4.8	cubic	 meters	 per	kW)	 of	the 	
total	 input	 rating	 of	all	 appliances	 installed	in	the	 space.	 Rooms	
communicating	 directly	with	the	space,	 in	which	 the	appliances 	
are	 installed, 	through	 openings	 not	furnished	 with	doors, 	are 	
considered	a...

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OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS
FIGURE 10.
The	confined	 space	shall	be	provided	 with	two	permanent	 horizontal	
ducts,	 one	commencing	 within	12	inches	 (300	mm)	of	the	 top	and	
one	 commencing	 within	12	inches	 (300	mm)	of	the	 bottom	 of	the	
enclosure.	 The	horizontal	 ducts	shall	communicate	 directly	with	the	
outdoors.	See	Figure	10.
Each	 duct	opening	 shall	have	 a	minimum	 free	area	 of	1	square	 inch	
per	 2,000	 Btu/hr	 (1100	mm2	per	kW)	 of	the	 aggregate	 input	rating	 of...

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If	the	 water 	heater 	is 	being	 installed	 as	a	 replacement 	for 	an 	
existing	 heater	in	pre-existing	 venting,	a	thorough	 inspection	 of	
existing	 venting	system	must	be	 performed	 prior	to	any	 installation 	
work.
VENT	 DAMPERS	 -	Any	 vent	 damper,	 whether	it	is	 operated 	
ther mally 	or	other wise 	must	be	removed 	if	its 	use 	inhibits 	proper	
drafting	of	the	water	heater.
Thermally	 Operated	Vent	Dampers:	 this	gas-fired	 water	heater 	
has	 a	thermal	 efficiency	 at	or	 above	 80%...

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GAS PIPING
Contact	your	 local	 gas	service	 company	 to	ensure	 that	adequate 	
gas	 service	 is	available	 and	to	review	 applicable	 installation	 codes	
for	your	area.
Size	 the	main	 gas	line	in	accordance	 with	Table	 3.	The	 figures	 shown	
are	 for	straight	 lengths	of	pipe	 at	0.5	 in.	W.C.	 pressure	 drop,	which	 is	
considered	 normal	for	low	 pressure	 systems.	 Note:	Fittings	 such	as	
elbows,	 tees	and	line	regulators	 will	add	 to	the	 pipe	 pressure	 drop.	
Also	 refer	 to	the	 current...

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SEDIMENT TRAPS
A	sediment	 trap	shall	 be	installed	 as	close 	to	 the 	inlet	 of	the 	water 	
heater	 as	practical	 at	the	 time	 of	water	 heater	 installation.	 The	
sediment	 trap	shall	 be	either	 a	tee	 fitting	 with	a	capped	 nipple	
in	 the	 bottom	 outlet	or	other	 device	 recognized	 as	an	 effective 	
sediment 	trap. 	If 	a	 tee	 fitting	 	 is	used, 	it 	shall	 be	installed	 in	
conformance	 with	one	of	the	 methods	 of	installation	 shown	in	
the	Figures	15	and	16.
Contaminants	 in	the...

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FLAMMABLE
WARNING:If you do not follow these instructions exactly , a
fire or explosion may result causing property damage, personal
injury or loss of life.
BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH W ATER  AND  AIR PURGED FROM  ALL LINES
A.
C.
D .
WHA
T TO DO IF  YOU SMELL  GAS
Do not try to light any appliance.
Do not touch any electric switch; do not use any phone in your building.
Immediately call your gas supplier from a neighborsphone. Follow the gas suppliers instructions. If you...

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START UP CONDITIONS
DRAFT HOOD OPERATION
Check	draft	hood	 operation	 by	performing	 a	worst	 case	
depressurization	 of	the	 building.	 With	all	doors	 and	windows 	
closed, 	and 	with 	all 	air 	handling 	equipment 	and 	exhaust 	fans 	
operating	 such	as	furnaces,	 clothes	dryers,	range	hoods	 and	
bathroom	 fans,	a	match	 flame	should	 still	be	drawn	 into	the	draft 	
hood 	of 	the 	water 	heater 	with 	its 	burner 	firing. 		If	the 	flame 	is 	not 	
drawn	 toward	 the	draft	 hood,	 shut	off	water...

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CHECKING GAS INPUT
With	this	heater	 in	operation,	 determine	whether	it	is	 receiving	 the	
full	 rated	 input	of	gas.	 This	 may	be	done	 by	timing	 the	gas	 meter	
and	 measuring	 gas	pressure	 with	a	gauge	 or	manometer.	 When	the	
heater	 is	operating	 at	full	 capacity	 (full	gas	 input)	 it	should	 consume	
approximately	1	cubic	foot	of	gas	in	the	time	shown	in	 Table	5.
TABLE 5. INPUT CHECK TIME REQUIRED 
TO CONSUME 1 CU. FT. OF GAS
Model Type of Gas BTU Per 
Cu. Ft. Approx. Time Required To...