American Water Heater Commercial Gas NonDampered Water Heater CG3275T75 CG32100T77 User Manual

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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
Modeltype of Gas btu per 
cu. ft. approx. t
ime required t o...

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(generally	two	weeks	 or	more).	 Hydrogen	 gas	is	extremely 	
flammable	 and	explosive.	 	 To	prevent	 the	possibility	 of	injury 	
under	 these	conditions,	 we	recommend	 the	hot	water	 faucet, 	
located 	farthest 	away, 	be 	opened 	for 	several 	minutes 	before 	
any 	electrical 	appliances 	which	are	connected 	to	the 	hot	water 	
system	 are	used	 (such	 as	a	dishwasher	 or	washing	 machine).	 If	
hydrogen	 gas	is	present,	 there	will	probably	 be	an	unusual	 sound	
similar 	to	air 	escaping...

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It	is	 recommended	 that	the	Temperature-Pressure	 Relief	Valve	should 	
be	 checked	 to	ensure	 that	it	is	 in	 operating	 condition	every	6	months.
When	 checking	 the	Temperature-Pressure	 Relief	Valve	operation, 	
make	 sure	that	(1)	no	one	 is	in	 front	 of	or	 around	 the	outlet	 of	the 	
Temperature-Pressure	 Relief	Valve	discharge	 line,	and	(2)	that	 the	
water	 discharge	 will	not	 cause	 any	property	 damage,	 as	the	 water 	
may	 be	extremely	 hot.	Use	 care	 when	 operating	 valve	as	the...

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Lime	accumulation	 not	only	 reduces	 the	life	of	the	 equipment	 but	
also	 reduces	 efficiency	 of	the	 heater	 and	increases	 fuel	consumption.
The	 usage	 of	water	 softening	 equipment	 greatly	reduces	 the	
hardness	 of	the	 water.	 However,	 this	equipment	 does	not	always	
remove	 all	of	the	 hardness	 (lime).	For	this	 reason	 it	is	 recommended 	
that	a	regular	schedule	for	deliming	be	maintained.
The	 time	 between	 cleaning	will	vary	 from	 weeks	 to	months	 depending 	
upon	water...

25
4.	 Put	cap	with	 male	 adapter	 back	on	the	 container	 and	slide	 3/4”	
hose	 over	end	of	male	 adapter	 and	fasten	 in	place	 using	hose	
clamp	provided.
delIMe usInG flo-juG Method
5.	 Slide	 the	hose	 clamp	 over	end	of	hose	 and	slide	 hose	 over	the	
male	 adapter	 in	the	 water	 heater	 drain	opening	 and	secure	 in	
place	using	hose	clamp.
6.	 Lift	 container	 to	the	 “Pour”	 Position	 being	careful	 to	keep	 the	vent	
in	 the	 handle	 above	the	liquid	 level	and	pour	 the	UN•LIME	 into	
the...

26
leaKaGe checKpoInts
A.	 Water	at	the	 draft	 hood	 is	water	 vapor	 which	 has	condensed	 out	
of	 the	 combustion 	products.		 This	is	caused	 by	a	problem	 in	the	
vent.	Contact	the	gas	utility.
B.		*Condensation	 may	be	seen	 on	pipes	 in	humid	 weather	 or	pipe	
connections	may	be	leaking.
C.		*The	anode	rod	fitting	may	be	leaking.
D.		Small	 amounts	of	water	 from	temperature-pressure	 relief	valve	
may	 be	due	 to	thermal	 expansion	 or	high	 water	 pressure	 in	your	
area.
E.		*The...

27
troubleshootInG GuIdelInes
These	guidelines	should	be	utilized	by	a	qualified	service	agent.
	 Problem cause Solution
WATER lEAkSImproperly	sealed,	hot	or	cold	supply	connection,	relief	
valve,	drain	valve,	or	thermostat	threads.
Tighten	threaded	connections.
Leakage	from	other	appliances	or	water	lines. Inspect	other	appliances	near	water	heater.
Condensation	of	flue	products. Refer	to	CONDENSATION.
lEAkING T&P VAl VEThermal	expansion	in	closed	water	system.
Install	thermal	expansion	tank	(DO	NOT...

28
water pIpInG dIaGraMs
NOTES:
1.  Preferred piping diagram .
2.  The temperature and pressure relief valve setting shall not exceed press\
ure rating of any component in the system .
3.  Service valves are shown for servicing unit. Howeve r, local codes shall govern their usage.4.  The  Tank  Temperature Control should be wired to and control the pump between the wa\
ter heater(s) and the storage tank(s).SINGLE FL UE - (1 UNIT)
LEGEND
TEMPERA TURE & PRESSURE
RELIEF VA LVEPRESSURE RELIEF VA LVECIRCUL...

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NOTES:
1 .  Pref erred  piping  diagram.
2 .  The t emperat ure and  pressure  relief valve  setting  shall not exceed  pressure  rating  of  any  component  in the  syst em.
3 .  Servic e v alv es  are s hown f or serv icing  unit. However , local  codes  shall govern t heir usage.
4 .  The  Tank  Temperat ure Cont rol should  be wired t o and  control the pump  between t he wat er heat er(s)  and the storage t ank(s).
5 .  The  wat er heat er’s  operat ing thermost at  should  be set  5 degrees F...

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NOTES:
1 .  Pref erred  piping  diagram.
2 .  The t emperat ure and  pressure  relief valve  setting  shall not exceed  pressure  rating  of  any  component  in the  syst em.
3 .  Servic e v alv es  are s hown f or serv icing  unit. However , local  codes  shall govern t heir usage.
4 .  The  Tank  Temperat ure Cont rol should  be wired t o and  control the pump  between t he wat er heat er(s)  and the storage t ank(s).
5 .  The  wat er heat er’s  operat ing thermost at  should  be set  5 degrees F...