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T-H2-DV/T-H2-OS Service Manual

Ver. 1.01

CONFIDENTIAL

12-17. Adjusting manifold gas pressure

The manifold gas pressure on the T-H2-DV or T-H2-OS can be adjusted by following the procedures

below.

Adjusting the manifold pressure can cause unexpected combustion conditions during

operation, which can cause a health hazard, damage the T-H2-DV or T-H2-OS, and/or

shorten its lifespan. Therefore, changing the manifold pressure is not recommended

unless there are very strong reasons to do so (e.g. high elevation installations), and with

the consultation of the Technical Services Department.

Adjusting maximum manifold pressure

1. Ensure that T-H2-DV or T-H2-OS is not in operation.

2. Remove the screw off the manifold port of the T-H2-DV or T-H2-OS. (Figure 1)

3. Connect a manometer to the manifold port using a tube (Figure 2). Ensure that this connection is

secure enough to prevent gas leak.

4. Run water through the T-H2-DV or T-H2-OS to activate its operation. If presence of a gas leak is

detected, immediately shut off the T-H2-DV or T-H2-OS and inspect the tube/manifold connection;

otherwise, proceed onto the next step.

5. Press and hold down the “MAX” button on the computer board. While holding down the “MAX”

button, press either the “Increase” or “Decrease” button to increase or decrease the manifold gas

pressure, respectively (Figure 3). Refer to the manometer to verify that pressure has been set to

desired value.

6. After gas pressure has been set, deactivate the T-H2-DV or T-H2-OS, remove the manometer tube, and

replace the port screw.

Adjusting minimum manifold pressure