Primary Pump - Watts AERCO Modulex EXT Series Technical Application Manual

Modulex EXT Series Piping
Application Guide
BOILER LOOP DESIGN GUIDELINES

3.3. PRIMARY PUMP

The primary pump shall have a discharge pressure able to assure the designed water flow rate, taking
into account pressure drop losses as shown in Figure 2. When selecting a pump, take into account the
pressure drop across the boiler, fittings, accessories and piping. The primary pump electrical connection
shall be made at terminals A10 and N as shown in Figure 3.
Pumps shall be calculated by installers or engineers according to boiler and system parameters. The
waterside resistance curve of the boiler is shown in Figure 2. The pump is not an integral part of the boiler.
NOTE: Select the pump flow rate so that the boiler water outlet temperature is 190°F (87.8°C) or below.
Figure 2: Water Side Pressure Loss Charts
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
TAG-0099 Page 15 of 37
Phone: 800-526-0288 10.07.2021