Part 8 - Water Piping; General Plumbing Connection Guidelines - Westinghouse WGRGH**199 Series Installation, Start-Up, Maintenance, Parts, Warranty

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 mode.
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 mode.
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) Operation – This is the operating mode when there is a call for hot water.
Internal Recirculation Operation – When calls for hot water are satisfied, the water heater can be programmed to recirculate water
internally to more quickly and efficiently heat hot water. See Recirculation Modes, this manual, for details to fine tune the operation.
External Recirculation Operations – An external recirculation line must be installed in order to recirculate water externally. This mode
keeps an external recirculation loop warm to make hot water production more efficient and also aid in freeze protection. See
Recirculation Modes, this manual, for details to fine tune the operation.
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WHL-060 REV. 1.6.16