Weil-McLain GOLD DV WATER BOILER manual IIId Water piping all systems, Zoning with circulators

GOLD GV Water boiler series 3 — manual

IIId Water piping — all systems

Zoning with circulators

The GV internal system 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.

Size the common (primary) pipe for the combined flow of all circulators, or with a pipe cross-sectional area at least equal to the total areas of all zone supply pipes. You may also use the alternative sizing chart at right, based on maximum flow of 10 gmp per circulator.

Install and wire a separate relay for each zone circulator.

Alternate primary

manifold sizing

(max 10 gpm per circulator)

Number of		Suggested
circulators		pipe size
	1	1"
2	– 3	1½ "
4	– 5	2"
6	– 8	2½ "
9 – 12		3"

Zoning with zone valves

Each zone in the piping diagrams in this section is shown with an isolation valve on each side. Substitute a memory-stop valve for one of these in each zone in order to use the memory-stop valve for balancing flow as well as isolation.

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.

Additional components

If installation is to comply with ASME or Canadian requirements, an additional high temperature limit is needed.

•Purchase and install in system supply piping between boiler and isolation valve.

•Wire the second limit control in series with the boiler limit control.

•Set the second limit control at least 20 °F above the boiler limit control setting (maximum setting 240 °F).

A low water cutoff device is required when boiler is installed above radiation level or by certain state or local codes or insurance companies. Use low water cutoff designed for water installations. Electrode probe-type is recommended. Purchase and install in tee in supply piping above boiler.

If boiler is connected to heating coils located in air handling units where they can be exposed to refrigerated air, use flow control valves or other automatic means to prevent gravity circulation during cooling cycle. Circulation of cold water through the boiler could result in damage to the heat exchanger, causing possible severe personal injury, death or substantial property damage.

Do not remove either of the GV internal pumps for use elsewhere in the system. Both pumps are required for proper operation. Removing a pump will cause the boiler to malfunction. Substantial property damage could result.

Never install another pump in series with the GV boiler. Forced flow can cause improper operation of the boiler controls. Substantial property damage could result.

30 Part number 550-141-850/0699