American Water Heater (A)BCL3100T2756NOX Instruction Manual download pdf (Page 26)

7. If improper venting is observed during any of the above tests,

the venting system must be corrected.

FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR

CONTAMINATION AND UNSAFE CONDITIONS.

• If the back draft cannot be corrected by the normal method or

if a suitable draft cannot be obtained, a blower type ue gas

exhauster must be employed to assure proper venting and

correct combustion.

CHECKING THE INPUT

Follow these instructions to determine the ring rate of the water

heater.

1. Follow the procedure described in the "Initial Start Up" section

on page 25 to measure the static and dynamic supply gas

pressures. Verify that the static and dynamic supply gas

pressures conform to the values listed in Table 3 on page 8.

2. Use this formula to “clock” the meter. Be sure that other gas

consuming appliances are not operating during this interval.

(3600/T) x H = Btuh

T = Time in seconds to burn one cubic foot of gas.

H = Btu’s per cubic foot of gas.

Btuh = Actual heater input.

Example: (BCL3100T1996NOX)

T = 18.1 seconds

H = 1000 BTU/Cu.Ft.

Btuh = (3,600/18.1) x 1,000 = 199,000

(Compare with BCL3100T1996NOX model and rating.)

UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT EXCEED

THE INPUT SHOWN ON THE HEATER'S RATING PLATE.

WATER TEMPERATURE ADJUSTMENT

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.

The water temperature is controlled by a thermostat, Fig. 3,

which has two sensing elements. One sensor is located near the

top of the tank and the other is near the center. The thermostat

is set in the lowest position before the heater leaves the factory.

The thermostat temperature dial, Fig. 3, is accessible by

removing the control cover. The dial is adjustable and may be set

for 120°F (49°C) to 180°F (82°C) water temperature, but 120°F

(49°C) is the recommended starting point. It is suggested the dial

be placed on the lowest setting which produces an acceptable

hot water supply. This will always give the most energy efcient

operation. The temperature control has a 4°F xed differential.

Supply gas pressure shall be measured while the water heater

is not ring (static pressure) and while the water heater is ring

at full capacity (dynamic pressure).

If the supply gas pressure to the water heater is not between

the required minimum and maximum values given in Table 3

on page 8 adjust the supply gas regulator as necessary. Adjust

the supply gas regulator(s) per the regulator manufacturer’s

instructions to achieve the required “static” and “dynamic”

supply gas pressure.

Multiple Water Heater Installations:

In multiple water heater installations or in installations where

the installed water heater(s) share a common gas supply main

with other gas red appliances; the supply gas pressures shall

be measured at each water heater with all gas red appliances

connected to a common main ring at full capacity.

On multiple water heater installations the supply gas line regulators

shall be adjusted to provide gas pressure to each water heater

within the minimum and maximum supply pressure requirements

listed in Table 3 on page 8 with all gas red appliances connected

to a common gas main ring at full capacity.

NOTE: A pressure drop of more than 1.5” W. C. (0.37 kPa)

when the Main Burner ignites is an indication of an inadequate

supply of gas and can lead to ignition failure, rough starts and/

or rough operation. If a drop of more than 1.5” W. C. (0.37 kPa)

in supply gas pressure occurs when the Main Burner ignites,

ensure the supply gas lines and regulator(s) are properly sized

and installed. See the requirements for Supply Gas Regulator

on page 12 and Gas Piping on page 24. Ensure all requirements

and installation instructions are maintained.

CHECKING VENTING

The following steps shall be followed with each appliance

connected to the venting system placed in operation, while any

other appliances connected to the venting system are not in

operation.

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal pitch, as

required in the National Fuel Gas Code, ANSI Z223.1or the CAN/

CGA B149 Installation Codes and these instructions. Determine

that there is no blockage or restriction, leakage, corrosion and

other deciencies which could cause an unsafe condition.

3. So far as is practical, close all building doors and windows

and all doors between the space in which the water heater(s)

connected to the venting system are located and other spaces

of the building. Turn on all appliances not connected to the

venting system. Turn on all exhaust fans, such as range hoods

and bathroom exhausts, so they shall operate at maximum

speed. Close replace dampers.

4. Follow the lighting instruction. Place the water heater being

inspected in operation. Adjust thermostat so water heater

shall operate continuously.

5. Inspect vent system for leakage after 5 minutes of main burner

operation.

6. After it has been determined that each appliance connected

to the venting system properly vents when tested as outlined

above, return doors, windows, exhaust fans, replace

dampers and any other gas burning appliance to their previous

conditions of use.

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American Water Heater (A)BCL3100T2756NOX Instruction Manual Page 26

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