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Bulldog Boiler Ltd.

SHADOW™ Recommended Installation

Valve Piping: Pipe the SHADOW Ball Valve into a three-valve network. The Recommended Piping Diagram shows a typical isolation and by-pass valve set-up. Note the importance of the pressure gauges and strainer. If the valve must be separated from the actuator to complete this installation procedure, be careful to reassemble the actuator to the valve in exactly the same position. Do not manually open or close the valve when it is detached from the Actuator.
Valve Piping
  1. Y Strainer
  2. Pressure Gauges
  3. Isolation Valves
  4. SHADOW Feed Water Valve
  5. By-Pass Valve

Electrical: The Capacitance Probe coaxial cable must be connected to the SHADOW Actuator. The outer shielding of the coaxial cable is connected to the terminal marked “G” on the capacitance signal generator (Figure 1). The center wire on the coaxial cable is connected to the terminal marked “P” on the signal generator. The coaxial cable is low voltage wiring and therefore does not require external protection, such as Greenfield or conduit. The installation contractor must bring a 5 amp fused source of 110volt (with ground) power to the SHADOW Actuator. There are two electrical connector blocks inside the SHADOW Actuator. Block 1 contains connections numbered 1 through 6. Block 2 contains connections numbered 1 through 8. All the 110-volt wires are connected to Block 2. The white (L2/N) wire from the 110-volt source is connected to terminal 1 in Block 2; the black (L1) wire is connected to terminal 2 in Block 2; and the ground wire is connected to terminal 3 in Block 2. PLEASE NOTE that Block 2 connector, Terminals numbered 1-3 are 110-volt; Terminals numbered 4-8 are 24-volt.



Figure 1



Figure 2 - Signal Generator

SHADOW™ (patent pending) connected to Capacitance Probe for water level control.
  • Probe inserted in the McDonnell & Miller housing.
  • The McDonnell & Miller E-Head is used as the Low Water Cut-off.
  • Pump typically operated continuously with relief by-pass to Boiler Receiver tank.
SHADOW™ acts as a sophisticated single element controller to modulate the feedwater into the Boiler.