Armstrong FLO-RITE-TEMP 415 Інструкція зі встановлення та налаштування - Сторінка 9

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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

Line

3-Way Thermostatic Capsule

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 recircu-

lation 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 cap-

sule, 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