| | | Water piping should be arranged so that the circulating pumps discharge directly into the vessels. The water piping should be insulated to reduce heat gain and to prevent condensation. Air vents should be located at all high points in the water piping system, and drains should be located at all low points to facilitate complete system drainage. To reduce vibration | | and noise transmission, vibration absorbers should be provided. Shutoff valves should be provided to allow unit isolation during maintenance. Chilled water flow architectural switch is provided on the unit and is preset to open at approximately 50% of specified flow rate. | | |
| | | In order to prevent freeze-up of chilled water during unit shutdown, the chilled water pump(s) and air handler must be run for 15 minutes after the burner is shut off. This will allow time for the automatic dilution cycle to be completed. The standard unit must not be subjected to water pressures in excess of 981 kPa (10 kg/cm2G). An expansion tank should be provided in the chilled/hot water line. Thermometers and pressure gauges should be field-installed at the inlet and outlet of the chilled/hot water line, and the cooling water line. | | 5. During heater operation, the cooling water circuit should not be in operation and should be blown down. 6. All external piping connections are provided with JIS 10K flanges unless noted. 7. A drain line must be installed from the smoke chamber drain to a floor drain. 8. See Figure 32 (DE), Figure 48 (NE), Figure 61 (LE) for typical system piping arrangement. | | |
| | | Strict leveling tolerances must be adhered to for trouble-free operation. SANYO units are furnished with four leveling reference points, one on each corner of the lower shell or tube sheet. Each reference point is designated by three punch marks. A convenient method to check leveling tolerances is to fill a clear vinyl hose with water and measure the | | difference in the water level at the two points. The tolerance that must be maintained from end-to-end and side-to side is 1mm (1/25") of difference for each 1m length between points. It is not necessary to check levels diagonally. When the unit does not meet this requirement, the unit must be shimmed in order to meet leveling tolerances. | | |