MK Plastics Venturi IO&M - Manual (Page 2)

2
Receiving and Inspection
Carefully inspect the venturi/blower and accessories for any damage and shortage immediately upon receipt of the
fan.
• Turn the blower wheel by hand to ensure it turns freely and does not bind.
• Inspect the PVC manual control damper for free operation of all moving parts.
• Record on the Delivery Receipt any visible sign of damage.
This manual deals primarily with the installation and maintenance of the Venturi system in conjunction with it’s FRP
blower. For further, more complete operational & maintenance details on the FRP blower (fan), please refer to MK
Plastics Bulletin ‘Installation, Operation, and Maintenance Manual’ for FRP centrifugal & Inline fans.
Venturi Installation
1. Set the Venturi carefully on the curb, avoiding damage to the water pipe and the electrical heater strip (if
supplied). Confirm that the Venturi stack is 100% vertical for proper washing operation.
2. The water line for the washing ring, spray nozzle and the 120-volt electrical power supply for the heater strip
must be below the roof.
3. Provide piping to the water lines, (washing ring and spray nozzle); install a pressure gauge and a 3-way
solenoid valve per washing line. See page .5 for details on the valves.
4. The Ø1/2” copper pipe for the Venturi washing ring runs down the length of the stack, protrudes through the
curb cap and stops short of the inlet flange for connection. The end of the pipe will be unthreaded. For the
spray nozzle attachment, there will be a Ø1/2” sch. 80 CPVC female adapter for the incoming water line.
Insure there is no debris in the adapter prior to piping connection. See Fig. 2 for details. The heater cable
will have a standard 120-volt plug for outlet electrical connection.
Fig. 2 – Spray Nozzle Detail
5. The installation of the solenoid valves should be as close as possible to the washing units, (spray
nozzles/washing rings), as detailed in the submittal. The control timer can be located as required. For further
details regarding the washing sequence, see Fig. 4 & Fig .5.
6. Connect the Venturi stack to the perchloric acid hood by means of ductwork. Use 316 stainless steel,
unplasticized PVC or FRP ducting for corrosion resistance. Avoid any metal contact with the exhausted
fumes, such as fastening bolts or screws. Use only gasketing that is resistant to perchloric acid.
7. The weight of the ductwork should not be supported by the ventruri stack. Additional supports must be
used to support the weight, similar to as shown in Fig. 3.
WARNING
The venturi blower has rotating parts. Safety
precautions should be exercised at all times during
installation, operation, and maintenance.
ALWAYS disconnect power prior to working on fan.