Multi-Zone Radiant Heating System Piping; Outdoor Reset Control - Weil-McLain Gold GV Manual

IIIh
Water piping — multi-zone radiant system
Figure 14a
Figure 14b Auto return temp regulation;
34
GOLD GV W GOLD GV W
GOLD GV Water Boiler — Series 4 GOLD GV W GOLD GV W
Manual bypass; fixed temp
operation only
outdoor reset or fixed temp
ater Boiler — Series 4 ater Boiler — Series 4
ater Boiler — Series 4 ater Boiler — Series 4
Multi-zone radiant heating
system piping
Multi-zone systems require automatic regulation of the
system supply temperature because of widely varying
load conditions. Figure 14a (zone-valve zoning) and
Figure 14b (circulator zoning) show suggested piping
for these systems.
Select an automatic temperature control valve or
motor-operated valve which can be adjusted for the
desired supply water temperature.
Zone-valve zoning — The suggested piping uses a
separate circulator for system circulation to provide
the higher flow typical of radiant heating systems and
to assure good temperature distribution in the system
when the return water temperature is low.
Circulator zoning — The GV internal circulators must
not be removed. Provide a separate circulator for each
zone.

Outdoor reset control

Apply Figure 14a or 14b for any system intended for
outdoor reset of the supply water temperature. Use a
motor-operated three-way valve and an outdoor reset
temperature control system.
Legend
1 Isolation valves
2 Automatic air vent (with diaphragm-type
expansion 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 separator to tank fitting as in
Figure 10.)
4 Zone valve
5 System or zone circulator
6 Flow/check valve
7 Hose bibb purge valve
8 Boiler pressure/temperature gauge
9 System supply temperature gauge
10 Supply temperature automatic mixing valve
Part number 550-141-856/0703