Weil-McLain CGa-8 Betriebsanleitung PDF herunterladen (Seite 10)

10 550-110-132/1298

CGi

Water Piping

Piping MULTIPLE ZONES:

Piping for use with REFRIGERATION SYSTEMS:

Water

chiller

Expansion tank

Circulator

Check

valve

Strainer

Boiler

Shut-off

valve

System

supply

System

return

Balancing

valve

301-067b

CONT’D

FIGURE 4

Installing boiler on

REFRIGERATION SYSTEM

The boiler must be installed so the chilled medium

is piped in parallel with the heating boiler, using

appropriate valves to prevent the chilled medium

from entering boiler. Use piping as shown in

Figure 4.

If the boiler is connected to heating coils located in

air handling units where they can be exposed to

refrigerated air, gravity circulation during the

cooling cycle must be prevented with flow control

valves or other automatic means.

Piping for RADIANT HEATING SYSTEMS or CONVERTED GRAVITY SYSTEMS

c. Install balancing valves to adjust flow to dis-

tribute heat to all zones.

d. Separate relay is required for each circula-

tor.

4. Zoning with zone valves:

a. Install balancing valves to adjust flow to dis-

tribute heat to all zones.

b. Separate transformer is required to power

zone valves.

1. Follow instructions on pages 8 and 9 to install

near-boiler piping. (Also refer to Piping for radiant

heating systems or converted gravity systems if

applicable.)

2. See Figure 5A or 5B to complete installation.

3. Zoning with circulators:

a. Size each circulator to individual circuit re-

quirements.

b. Remove circulator on boiler.

Converted gravity (or steam) systems

Whenever possible, use the primary/secondary

piping shown in Figure 6A or 6B. This piping

design allows changing boiler flow rate without

affecting primary circuit flow rate.

If Figure 6A or 6B cannot be used, use the boiler

by-pass piping shown in Figure 7A or 7B.

You can also use the piping shown in Figure 8

(system by-pass) if the reduced flow rate in the

heating system will not cause heat distribution

problems.

Radiant heating systems

Preferably, use primary/secondary piping, as

shown in either Figure 6A or 6B. Alternatively, use

the method of either Figure 7A or 7B. Do not use

the piping of Figure 8, because this method does

not control radiant system supply temperature.

Failure to prevent low return water

temperature to the boiler could cause

corrosion of the boiler sections or burners, result-

ing in severe personal injury, death or substantial

property damage.

If radiant system tubing has no oxygen barrier, a

heat exchanger must be used.

Radiant heating system piping

should include a means of regulating

the boiler return water temperature AND the

system supply temperature (such as provided by

an injection pumping control). Boiler return water

temperature will be adequately controlled using

the methods shown in this manual provided the

system supply temperature is relatively constant.

• DO NOT apply the methods in this manual if

the system is equipped with an outdoor reset

control. Instead, provide controls and piping

which can regulate the boiler return water

temperature at no less than 130 °F regardless

of system supply temperature. Contact your

Weil-McLain representative for suggested

piping and control methods. Failure to prevent

cold return water temperature to the boiler

could cause corrosion damage to the sections

or burners, resulting in possible severe

personal injury, death or substantial property

damage.

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