Weil-McLain GOLD DV WATER BOILER manual IIIh Water piping — multi-zoneradiant system, Legend

GOLD GV Water boiler series 3 — manual

IIIh Water piping — multi-zone radiant system

Figure 14a Manual bypass; fixed temp

operation only

Zone 2

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

12"

max

Zone 1

Cold water

fill

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.

GV Boiler

85015b

Figure 14b Auto return temp regulation; outdoor reset or fixed temp

Zone 2

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

12"

max

Zone 1

Cold water

fill

1	Boiler 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

GV Boiler

85018b

9	System supply temperature gauge
10	Boiler return temperature gauge

13Supply temperature automatic mixing valve

34 Part number 550-141-850/0699