Baseboard System Piping — Circulator Zoning; Zone Valve Zoning - Weil-McLain GV90+ Manual

GV90+ Series 2
Install water piping
Baseboard system piping —
CIRCULATOR zoning (primary/secondary)
Apply Figure 17 for circulator zoning on systems using baseboard heaters.
The heaters can be any baseboard style, including finned tube or cast iron.
circulator cannot be removed from the boiler for use as
one of the zone circulators. It must remain as shipped from
the factory to allow proper flow control inside the boiler.
You will need a circulator for each zone. Provide circulator
relays or circulator zone controller.
Baseboard system piping —
ZONE VALVE zoning (direct connection)
The boiler internal circulator can be used to circulate many zone-valve
zoned systems as shown in Figure 18, page 17 for application on systems
using baseboard (finned tube or cast iron).
valve for one of the isolation valves in each zone to use the
memory-stop valve for balancing flow as well as isolation.
transformer to power the zone valves. Size the transformer
to handle the total rated load of all connected zone valves.
Alternatively, use a zone valve zone controller.
valves, install an isolation relay. Connect the zone valve end
switch wires to the isolation relay coil. Connect the isola-
tion relay contact across the boiler T-T terminals. Failure to
comply can result in damage to boiler components or cause
unreliable operation, resulting in severe property damage.
1. Figure 18, page 17 and Figure 19, page 17 provide guidelines for check-
ing whether the GV90+ internal circulator can provide sufficient flow
when directly connected to a two-pipe baseboard system.
The outputs of GV90+ boilers are all too high for connection
to a single-loop series-loop system. To apply to an existing
series loop system, the system must be fitted with trunk lines
to convert to a split-loop system. Provide either one or two
trunk lines to meet the minimum number of circuits and
maximum loading per circuit given in Figure 19, page 17.
2. The system pipe sizing must be no smaller than shown in the Legend
for Figure 18, page 17.
3. Values shown for maximum circuit lengths, maximum load per circuit
and the maximum feet baseboard per circuit are limits that ensure
the internal circulator will have sufficient head to provide the flow
needed for each circuit.
16
-
GAS FIRED WATER BOILER
(continued)
— The GV90+ internal system
.
,
.
—
Substitute a memory-stop
Provide a separate 24-volt
—
. When using 3-wire zone
— Boiler Manual
Baseboard system — circulator zoning
1 Isolation valves
2 Automatic air vent (with
diaphragm-type expan-
sion tank), or connect to
tank fitting (closed-type
expansion tank).
3 Diaphragm- or bladder-
type expansion tank, if
used. (For closed-type
expansion tank, pipe
from top of air separa-
Boiler loop pipe size
GV90+3/4 1"
GV90+5/6 1¼"
tor to tank fitting as in
Figure 15, page 14.)
6 Flow/check valve
7 Hose bibb purge valve
8 Boiler pressure/tempera-
ture gauge
16 Cold water fill line — see
Figure 15, page 14 for
typical components
Part number 550-142-903/1016