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GOLD CGa Gas-Fired Water Boiler — Boiler Manual
18
Part Number 550-101-009/0107
Water piping — multiple zones
Piping multiple zones
Follow instructions on pages 16 and 17 to install near-
boiler or single-zone piping. (Also refer to 0IPINGFOR
RADIANTHEATINGSYSTEMSORCONVERTEDGRAVITYSYS
TEMS
below, if applicable.)
See &IGURE or &IGUREPAGETOCOMPLETEIN-
stallation.
Zoning with circulators (Figure 11)
(return temp over 130°F)
1. Size each circulator to individual circuit require-
ments.
$ONOTINSTALLCIRCULATORONBOILEREXCEPTFORPRI-
mary/secondary piping).
3. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
4. Install and wire a separate relay for each zone cir-
culator.
Zoning with zone valves (Figure 12)
(return temp over 130°F)
1. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
2. Provide a separate 24-volt transformer to power the
zone valves. Size the transformer to handle the total
rated load of all connected zone valves.
3c
Piping for radiant heating
systems or converted gravity
systems
Converted gravity (or steam) systems
Whenever possible, use the primary/secondary piping
shown in &IGURES or on page 21. This piping de-
sign allows changing boiler flow rate without affecting
primary circuit flow rate.
If
&IGURES or cannot be used, use the boiler-bypass
piping shown in
&IGURE or &IGURE ONPAGE9OU
can also use the piping shown in
&IGURE on page 25
(system-bypass), if the reduced flow rate in the heating
system will not cause heat distribution problems.
Failure to prevent low return water
temperature to the boiler could
cause corrosion of the boiler sec-
tions or burners, resulting in severe
personal injury, death or substantial
property damage.
Radiant heating systems
Preferably, use primary/secondary piping, as shown
in &IGURESor on page 21. Alternatively, use the
method of either
&IGURE or &IGURE on page 23.
$ONOTUSETHEPIPINGOF&IGURE (system-bypass),
because this method does not control radiant system
supply temperature.
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"OILERRETURNWATERTEMPERATUREWILLBEADEQUATELYCONTROLLEDUSINGTHEMETHODS
shown in this manual provided the system supply temperature is relatively constant.
$/./4 apply the methods in this manual if the system is equipped with an OUTDOORRESET
CONTROL
. Instead, provide controls and piping which can regulate the boiler return water
TEMPERATUREATNOLESSTHAN®ARDLESSOFSYSTEMSUPPLYTEMPERATURE#ONTACTYOUR
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 dam-
age.