3
THE BIG PICTURE
This RayTemp control is designed
to make recirculating domestic
hot water heating systems energy
efficient. In a recirculating sys-
tem, hot water is continuously
pumped throughout the building.
This large loop has many branch-
es which extend to fixtures in the
rooms. It is essentially a giant
radiator which has tremendous
heat loss. By lowering the tem-
perature of this loop it is possible
to dramatically reduce this heat
loss. The trick is knowing when to
lower the temperature without
running out of hot water. With
RayTemp, water temperatures are
automatically scheduled in antici-
pation of demand. So for the
peak demand in the morning, the water is preheated to a higher temperature. The control does
this automatically by recording a seven day profile of demand, and then it uses this information to
establish setpoints. The control continually adjusts this setpoint to meet demand, always main-
taining the lowest temperature which will fully meet user needs. This operation dramatically
lessens costly heat loss, lime deposits, and increases the life of the system. The control is prepro-
grammed with typical settings, making installation very simple. However, the program values can
be adjusted to accommodate many types of water heating systems. Output control is provided for
up to 4 stages of heat or four heaters. Two standard temperature sensors are connected to the
water heating systems at locations called “Supply”and “Return”.
Section 1. GETTING STARTED
Hot Water Use Throughout the Day
Fig # 8285.1
