Instructions / Assembly

WHL-590 REV. 7.27.16

2. When low fire settings have been obtained, flip DIP switch seven (7) to its original (OFF) position. This will return the heater to

normal operation.

3. Flip DIP switch six (6) to ON (high fire). Again check combustion readings with a combustion analyzer.

NOTE: DO NOT adjust the gas valve offset screw at high fire. The offset screw is only used to adjust combustion values at low fire.

4. When complete, flip DIP switch six (6) to its original (OFF) position. This will return the heater to normal operation.

5. Allow heater to operate normally. Ensure it is operating properly.

6. Reinstall the heater front cover.

7. Use a Phillips Head screwdriver to reinstall the heater top cover.

PART 8 – WATER PIPING

A. GENERAL PLUMBING CONNECTION GUIDELINES

 Pipe material must be suitable to meet local codes and industry standards.

 The pipe must be cleaned and without blemish before any connections are made.

 Do not apply a torch within 12” of the bottom connections of the water heater. Doing so could damage the water heater. Such

damages ARE NOT covered by product warranty.

 The size of the hot water pipe should be ¾” diameter.

 Isolation (shutoff valves) should be used to ease future servicing. Westinghouse offers isolation valves (Part #7850P-090).

These optional parts may be purchased separately.

 All water piping should be insulated.

Figure 21 – Operations

Standard (DHW) Mode – This is the operating mode when there is a call for hot water.

Preheat or Internal Recirculation Modes – When calls for hot water are satisfied, the water heater is factory programmed to Preheat

and automatically maintain the temperature set point of the water heater – 24 hours a day, 7 days a week. The differential setting can

be adjusted to control the temperature set point.

Internal Recirculation Mode allows the installer to program specific recirculation functions by day and time to circulate and heat water

more efficiently - when the user most needs hot water. See Recirculation Functions, this manual, for details.