Greenheck Waterwash (458292) - Manual (Page 22)

22 April 2005
®
Control Panel
Pipe Size
Total Hood
Length
Minimum
Cabinet to
Hood Pipe Size
by others
Maximum
Water Usage
Hood
Pipe Size
3/4 in. 50 ft. or less 1/2 in. 4 gpm 3/8 in.
3/4 in. 100 ft. or less 3/4 in. 8 gpm 3/8 in.
Cold Water Requirements
Water Supply 30-60 psi
Average water consumption 0.1 gpm per linear foot of hood
Set pressure reducing valve to 25 psi on the gauge in the cabinet when running.
3) Water Supply to Cabinet:
Connect hot water supply to waterwash pipe fitting at bottom of control station. Connect cold water supply to
optional continuous cold water mist pipe fitting at bottom of control station. The water requirements to the
cabinet are detailed in the Engineering Specifications.
Optional Reduced Pressure Backflow Preventer:
Water solenoid valves and detergent line are factory-mounted inside the control panel (See Fig. 5, 6 & 7, page 7).
The reduced pressure backflow preventer and strainer (provided) must be field piped in the supply line before
the control panel. The backflow preventer relief valve must also be piped to a drain.
4) Control Cabinet to Hood Plumbing:
The waterwash plumbing requires 3/4 in. or 1 in. pipe (by others) depending on the length of hood in each
washing sequence. The optional continuous cold water mist plumbing requires 1/2 in. to 3/4 in. pipe (by others)
depending on the total length of hood. Only reduce to 3/8 in. at the hood connection.
See the Engineer Specifications for information on the pipe size required.
For Systems with a Vacuum Breaker:
Piping from control station to hood includes a detergent line and a vacuum breaker. The vacuum breaker must
be installed at the highest point in the system (and a minimum of 6 in. above the hood water supply line). The
detergent line joins the supply line downstream from the vacuum breaker as shown in Fig. 2, 3 & 4, page 7.
Where optional solenoid valves are used in systems with multiple hood sequence washing, additional piping
must be installed downstream from the vacuum breaker. Hot water/detergent supply pipe connects to hood
piping at top rear corner of hood.
5) Drain Connection:
Install hood drain pipe at bottom rear corner of hood as shown in Fig. 1. A 2 inch NPT female fitting is provided.
A grease trap is recommended in the drain to avoid clogging the sanitary sewer. If a RPBP is shipped with the
control panel, an air gap assembly may be required and will need to be plumbed to a sanitary sewer. See
drawing on page 42 of the drawing diagram section of this manual.
2) Optional Continuous Cold Water Mist Engineering Specifications:
Plumbing & Electrical