American Water Heater 30 Gallon UltraLow NOx Natural Gas Water Heater GU6130T30 User Manual

11
Chimney Connection
IMPORTANT: Before connecting a vent to a chimney, 
make sure the chimney passageway is clear and free of 
obstructions. The chimney must be cleaned if previously 
used for venting solid fuel appliances or fireplaces. Also 
consult local and state codes for proper chimney sizing and 
application or, in the absence of local and state codes, the 
“National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current 
edition.
•  The connector must be installed above the extreme 
bottom of the chimney...

12
Water System Piping
Piping Installation
Piping, fittings, and valves should be installed according to 
the installation drawing (Figure 13). If the indoor installation 
area is subject to freezing temperatures, the water piping 
must be protected by insulation.
The water supply pressure should not exceed 80 psi. If this 
occurs, a pressure reducing valve with a bypass should be 
installed in the cold water inlet line. This should be placed 
on the supply to the entire house in order to maintain equal...

13 Please note the following: 
•  The system should be installed only with piping that is 
suitable for potable (drinkable) water such as copper, 
CPVC, or polybutylene. This water heater must not be 
installed using iron piping or PVC water piping.
•  Use only pumps, valves, or fittings that are compatible 
with potable water.
•  Use only full flow ball or gate valves. The use of valves 
that may cause excessive restriction to water flow is 
not recommended.  
•  Use only 95/5 tin-antimony or other...

14
Temperature and Pressure 
Relief Valve
Explosion Hazard
If the temperature and pressure relief valve 
is dripping or leaking, have a qualified 
person replace it.
Examples of a qualified person include:
licensed plumbers, authorized gas company 
personnel, and authorized service 
personnel.
Do not plug valve.
Do not remove valve.
Failure to follow these instructions can 
result in death, or explosion.
WARNING
For protection against excessive pressures and 
temperatures, a temperature and pressure...

15 •  The domestic hot water line from the water heater 
should be vertical past any mixing valve or supply line 
to the air handler to remove air bubbles from the sys-
tem. Otherwise, these bubbles will be trapped in the air 
handler heat exchanger coil, reducing the efficiency.
•  Do not connect the water heater to any system or 
components previously used with non-potable water 
heating appliances when used to supply potable water.
NOTE: Water heaters covered by this manual are suitable 
for...

16
Water Heater Location
Water heater location is important and can affect system 
performance. Please check the following:
□   Installation area free of corrosive elements and 
flammable materials.
□   Centrally located with the water piping system. 
Located as close to the gas piping and vent pipe 
system as possible.
□   Located indoors and in a vertical position. Protected 
from freezing temperatures.
□   Proper clearances from combustible surfaces 
maintained and not installed directly on a carpeted...

17
OPERATING YOUR WATER HEATER
Lighting Instructions
Read and understand these directions thoroughly before 
attempting to light or re-light the pilot. Make sure the 
viewport is not missing or damaged. (See Figure 23) Make 
sure the tank is completely filled with water before lighting 
the pilot. Check the data plate near the gas control valve/
thermostat for the correct gas. Do not use this water heater 
with any gas other than the one listed on the data plate. 
If you have any questions or doubts,...

18
1.  Turn the gas control/temperature knob  counterclockwise      to the OFF setting. The status light will stop blinking 
and stay on for a short time after the water heater is turned off. See Figure ‘A’.
IMPORTANT/IMPORTANTERead the manual for complete instructions and safety information. For a free manual, call 1-800-821-2017.
Lea el manual para instrucciones completas e información de seguridad. Manuales gratuitos, etiquetas, o rótulos en 
español se pueden obtener llamando al 1-800-821-2017.
FOR...

19
Burner Flames
Inspect the burner flames through the viewport. Flames 
should be very small with a blue haze and small amounts 
of yellow or orange at the edges. After several minutes 
of operation, the burner screen may glow red. If large 
flames are observed at any time, shut-off unit and call a 
qualified person.
Water Temperature Stacking
Stacking occurs when a series of short draws of hot water 
(3 gallons or less) are taken from the water heater tank. 
This causes increased cycling of the burner...

20
Water Temperature Regulation
The thermostat is adjusted to the pilot position when it 
is shipped from the factory. Water temperature can be 
regulated by moving the temperature dial to the preferred 
setting. The preferred starting point is 120°F at the “HOT” 
setting. Align the knob with the desired water temperature 
as shown in Figure 19A. There is a hot water scald 
potential if the thermostat is set too high. 
NOTE: Temperatures shown on the gas control valve/
thermostat are approximates. The...