Measuring Inlet Gas Pressure; Unit Draining And Filter Cleaning - Takagi 110 Outdoor Installation Manual And Owner's Manual

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Installation manual and owner's manual (52 pages)

Table Of Contents

Table of Contents

1. Turn off all electric power to the water heater if service is to be performed.

2. Turn the manual gas valve located on the outside of the unit to the off position.

3. Failure to follow these steps could lead to fire or explosion, resulting in personal injury

or death.

WARNING

The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions

on how to check the inlet gas pressure. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.

Shut off the manual gas valve on the gas supply line.

Remove the screw from the pressure port which is located on the gas inlet of the

water heater shown in the diagram on the right.

Connect the manometer to the pressure port and zero the manometer.

Re-open the manual gas valve. Verify that there are no gas leaks.

With all gas burning equipment off, take a reading of the static gas pressure and

make a note of it.

Measure gas supply pressure at maximum heater operation: Open hot water

faucets to create maximum flow. Press the MAX button on the computer board.

(Refer to the diagrams below.) Take a reading of the supply dynamic gas pressure

with all gas burning equipment running at maximum rate.

The static and dynamic pressures should be within the ranges specified on the

heater's rating plate and the table on p. 24.

The difference of static to dynamic pressure should not exceed 1.5" W.C. Pressure drops that exceed

1.5" W.C. can indicate restricted gas flow, undersized gas lines, and/or undersized supply regulators.

(NOTICE: In Canada, the pressure drops cannot exceed those specified in CSA B149.1.)

Measure gas supply pressure at minimum heater operation: Reduce water flow so the heater is running

at minimal operation. Press the MIN button on the computer board. (Refer to the diagrams below.)

Take a supply gas pressure reading and verify that it is within the specified inlet gas pressure range.

110 / 310 Computer board

UNIT DRAINING and FILTER CLEANING

1. Close the manual gas shutoff valve.

2. Turn off power to the unit and wait a couple of seconds. Turn

on again.

3. Wait 30 seconds, and then turn off power to the unit, yet again.

4. Close the inlet water shutoff valve.

If the heater is part of an Easy-Link, close the inlet and outlet

water valves to isolate the heater. Then proceed to step 6.

5. Open all hot water taps in the house. When the residual

water flow has ceased, close all hot water taps.

6. Have a bucket or pan to catch the water from the unit's drain

plugs. Unscrew the two drain plugs (large and small) to drain

all the water out of the unit.

7. Wait a few minutes to ensure all water has completely drained from the

unit.

8. Clean the filter: Check the water filter located within the cold inlet.

With a tiny brush, clean the water filter of any debris which may have

accumulated and reinsert the filter back into the cold water inlet.

9. Securely screw the drain plugs back into place.

Hand- tighten only.