User Guide

47
SERIES 2E
Installation, Operating & Service Manual
109443-01 - 6/19
Appendix: Low Return Water Temperatures (continued)
Primary-Secondary Pumping:
This is an improvement over
simple by-pass piping to reduce
condensation.
Again this is a fixed system. It
can not adapt to variations in
temperature and flow.
Best Alternative: U.S. Boiler offers a system by-pass kit [part number 107795-01] that addresses these
situations.
A strap on temperature sensor measures boiler inlet temperatures. This temperature signal is sent to a variable
speed pump that will ensure boiler inlet temperatures are always greater than the factory by-pass kit set point of
120F.
Kit includes all fittings, pump,
sensor and instructions.