Westinghouse WBRCNG140F Installation Manual download pdf (Page 32)

WHL-015 REV. 12.17.14

Figure 20 – DHW Priority with Outdoor Reset and Recirculation

NOTES:

1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local

codes.

2. All closely spaced tees shall be within 4 pipe diameters center to center spacing.

3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees.

4. The minimum pipe size of DHW piping should be ¾” diameter and CH piping should be 1” in diameter.

5. Circulators are shown with isolation flanges. The alternative is standard flanges with full port ball valves. Purge valves can be used

with circulator flanges as an alternative.

6. Piping shown is Primary/Secondary. System flow (secondary loop) must be greater than the appliance’s primary loop flow.

7. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

8. VERY IMPORTANT – Minimum flow rates outlined in this manual must be maintained through the heat exchanger to minimize short

cycling.

9. Each heating zone of a pump-based system has its own circulator with turns on when a zone thermostat calls for heat.

D. CIRCULATOR SIZING

The heat exchanger has a pressure drop that must be considered in your system design. Refer to Table 15 for pressure drop through

the heat exchanger.

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Westinghouse WBRCNG140F Installation Manual Page 32