Armstrong FLO-RITE-TEMP 665 Istruzioni per l'installazione e la regolazione - Pagina 9
Sfoglia online o scarica il pdf Istruzioni per l'installazione e la regolazione per Scaldabagno Armstrong FLO-RITE-TEMP 665. Armstrong FLO-RITE-TEMP 665 17. Instantaneous water heater. instructions for single and double wall units
Anche per Armstrong FLO-RITE-TEMP 665: Istruzioni per l'installazione e la regolazione (20 pagine)
Stampa la pagina
FLO-RITE-TEMP
Recirculation System Piping and Operation
Because of its relatively small size and compact-
ness, the FLO-RITE-TEMP can easily be installed
close to the point of water use eliminating the need for
a recirculation system.
In applications where water heaters are located
in basements or utility rooms and feed an entire
building or wing a recirculation system or loop must
be utilized to assure instantaneous hot water to all
usage points.
The recirculation system is made up of several
different components designed to work together to
maintain the temperature of the water in the loop at
times of low or no flow.
Recirculation pump - This is a constant GPM
pump that runs continuously regardless of the hot
water
demand from the loop. Its function is to
continually recirculate the water in the loop in order
to maintain the temperature during low or no flow
conditions. As a rule of thumb, the capacity of the
pump should be approximately 10 to 15 percent of the
maximum capacity of the FLO-RITE-TEMP and be
able to overcome any head found in the loop. The
recirculation pump however, may be larger than 15
percent. But when a larger pump is used, a full line
size bypass with a globe valve must be piped to divert
most of the flow around the thermostatic capsule.
Recirculation
Pump
Capsule Balance
Globe Valve
Loop or System
Thermometer
Unit Setting Thermometer
October 31, 2002 @ 3:15 pm
Line
3-Way Thermostatic Capsule
A
B
C
Bypass to drain
Three-way Thermostatic Capsule - This
device has a set point roughly 20 degrees below the
set point of the FLO-RITE-TEMP and will maintain
the temperature in the loop between the set point of
the capsule and the set point of the FLO-RITE-
TEMP. The capsule senses the temperature of the
recirculated water and compares it with its pre-set
temperature. If the temperature in the loop drops
below the capsule's set point because of radiation loss
from the piping and no hot water demand from the
loop, then the capsule begins to divert some of the
loop's flow to the inlet of the FLO-RITE-TEMP
(ports A to B) for reheating. This diversion will bring
the temperature of the loop back up to its required
temperature. Once the temperature in the loop is over
the capsule's set point all flow from the recirculation
pump now goes straight through the capsule (ports A
to C) and the return water is fed back to the hot water
supply line. To regulate flow to the capsule, a
balancing/bypass line with globe valve is required.
This diverting recirculating system eliminates
the need for aquastats and any electrical wiring. It is
a self contained, self regulating system that controls
the temperature of the water in the loop during low or
no hot water demand situations. When there is a
demand for hot water the temperature of the water
introduced into the system is instantly controlled by
the FLO-RITE-TEMP feed forward mode of operation.
Fig. 9-1
9