Pressure Relief Valve; Electrical Connections - Takagi 110U Indoor (T-KJr2U-IN) Installation Manual And Owner's Manual

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Installation manual and owner's manual (57 pages)

Installation manual and owner's manual (56 pages)

Installation manual and owner's manual (57 pages)

Table Of Contents

Table of Contents

The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a

Hi-Limit switch) therefore a "pressure only" relief valve is required.

• This unit does not come with an approved pressure relief valve.

• An approved pressure relief valve must be installed on the hot water outlet.

• The pressure relief valve must conform to ANSI Z21.22 or CAN 1-4.4 and installation must follow local

codes.

• The discharge capacity must be at least 140,000 BTU/h for the 110U (T-KJr2U) models, 190,000 BTU/h

for the 310U (T-K4U) models, and 199,000 BTU/h for the 510U (T-D2U) models.

• The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa).

• The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash

on anyone or on nearby equipment.

• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 in.

(152 mm) from the floor. This discharge tube must allow free and complete drainage without any

restrictions.

• If the pressure relief valve installed on the water heater discharges periodically, this may be due to a

defective thermal expansion tank or defective pressure relief valve.

• The pressure relief valve must be manually operated periodically to check for correct operation.

• No valve must be placed between the relief valve and the water heater.

Follow the electrical code requirements of the local authority having jurisdiction.

In the absence of such requirements, follow the latest edition of the National

Electrical Code ANSI/NFPA 70 in the U.S. or the latest edition of CSA C22.1

WARNING

Canadian Electrical Code Part 1 in Canada

When servicing or replacing parts within the water heater, label all wires prior to

disconnection to facilitate an easy and error-free reconnection. Wiring errors can

cause improper and dangerous operation. Verify proper operation after servicing.

CAUTION

All indoor models come with a power plug instead of a junction box. The following procedure is for

outdoor models only.

1. The water heater must be electrically grounded. Do not attach the ground wire to either the gas or

the water piping.

2. The water heater requires 120 VAC, 60 Hz electrical power supply that is properly grounded.

• A proper disconnect (i.e. on/off switch, power plug, etc.) controlling the main power to the water

heater must be provided for service reasons. (Must comply with local codes.)

• Connect the power supply to the water heater exactly as shown in the wiring diagram.

3. A green screw is provided in the junction box to ground the connection.

4. Can be hardwired or wired to a plug-in.

5. The use of a surge protector is recommended in order to protect the unit from power surges.

Indoor models only