Differential Switch And Dip Switch; Wiring For Circulation Pump ⋯⋯⋯⋯⋯⋯⋯10 - Toyotomi OM-128HH Installation Manual

Instantaneous oil-fired water heater

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Operation instructions manual (16 pages)

Table of Contents

NOTE: Make sure that the power supply cord is disconnected when changing the position of DIP Switch is selected.

The differential switch on the main circuit board controls does not change the heat exchanger water temper-

ature. The switch can be set at a delta (on/off) of 3.6˚F (2˚C), 18˚F(10˚C), or 36˚F (20˚C). A higher delta reduces

burner short cycling.

NOTE: The position of DIP Switch is set to 18˚F differential from factory.

Select the position Differential Switch by the DIP Switch (SW1).

Select the differential range by the DIP Switch, No.2 or No.3.

Make sure that the DIP Switch No.1 is "ON" position.

DIFF

No.

(AVAILABLE FROM A PLUMBING SUPPLY COMPANY)

This water heater is equipped with a power terminal for a circulation pump. You can operate the circulation

pump in conjunction with the power switch of the water heater by connecting the pump to the "K" terminal

of the circuit board.

When the power switch is "ON", the power terminal for the circulation pump "K" constantly outputs

AC120V. Any circulation pump that operates in AC120V and consumes 300W or less can be connected to the

power terminal "K". Use the attached lead wire for circulation pump for wiring according to the instruction

of diagram below.

Remove the open-terminal connected to the "K" terminal.

Connect to the circulation pump using the attached couplers (Red).

See the wiring diagram below for wiring to the circuit board.

Connect the lead wire for circulation pump to the "K" terminal of the circuit board.

How to use the coupler

Make

3/16 in.

(4-5mm)

space.