Catalogue

18 CAB-PRC001-EN
General Data
End Valves
Each piping package includes a ball valve for the entering water pipe and one of the following end
valves on the leaving water pipe: ball valve, manual circuit setter, or an auto circuit setter. These
valves serve as the field connection points on all Force-Flo piping packages.
Ball Valves
Ball valves, also known as stop or end valves, allow the unit to be cut off for service purposes. These
valves have a two-inch handle that rotates 90° to a fully open position. The valve body is cast brass,
and the ball is polished brass with a Teflon
®
seat. Ball valves are available as end valves on both
the entering and leaving water pipes.
Manual Circuit Setter
In lieu of a ball valve on the leaving water pipe, a manual circuit setter, also known as a manual flow
control valve, acts as both a flow setting device and a stop valve. This valve allows water flow
through the cabinet heater to be set quickly and accurately.
The manual circuit setter includes Schrader ports in the valve body. These ports are used to
measure the pressure drop across the valve. This pressure drop can be compared to factory
supplied curves that relate the pressure drop to a specific flow rate. This valve also has a memory
stop that helps find the correct setting quickly.
Auto Circuit Setter
An auto circuit setter is an automatic flow control device available on the leaving water pipe. The
auto circuit setter includes a cartridge within the valve body that is sized to allow a specific flow
rate through the coil. This valve sets flow through the coil without any action required by a system
piping balancer. The auto circuit setter is available on the leaving water pipe with a ball valve.
The auto circuit setter also includes two P/T’s plugs in the valve body to allow measurement of the
pressure drop temperature through the valve.
Control Valves
Piping packages are available with or without control valves. All control valve options are factory
mounted and wired to the Force-Flo unit controls.
Tw o - Wa y / Tw o - Po s i t i o n Va l v e s
These valves will either fully open or close in response to a 24 Vac signal from the Tracer controller.
Control valves are direct-acting valves. The control valve is factory mounted in the leaving water
pipe downstream of the coil. Always use some means of relieving pump head pressure with two-
way valve applications. Normally open or normally closed valves are available.
Three-Way/Two-Position Valves
These valves will either allow full water flow through the coil or divert the flow through a bypass
line. The valves respond to a 24 Vac signal from the Tracer controller. Control valves are direct
acting valves. All three-way valve packages include a balance fitting in the bypass line to allow flow
balancing in the bypass position. Three-way valves are factory mounted in the leaving water pipe
downstream of the coil. Normally open or normally closed valves are available.
Two-Way Modulating Valves
These valves modulate the water flow through the coil in response to a signal from the Tracer
controller. Modulating valves are three-wire floating point equal percentage valves, and are factory
mounted in the leaving water pipe downstream of the coil.
Three-Way Modulating Valves
These valves modulate the water flow through the coil in response to a signal from the Tracer
controller. Three-way valves allow water that is directed through the coil to mix with water directed
through the bypass line. This mixture exits through the leaving water pipe. Modulating valves are
CAB-PRC001-EN.book Page 18 Tuesday, May 8, 2012 10:11 AM