Rp Device Initial Start Up - GAYLORD CG3 Series Technical Manual

RP DEVICE
The reduced pressure principle device (RP) is required to
prevent contaminated water from backflowing upstream to
potable water. The unit provided in the Gaylord control cabinet
is manufactured by Watts Regulator Co.
1. Initial Start-up - To avoid water hammer or shock damage
perform the following initial start-up procedures:
A. Close the outlet hand valve.
B. Open the inlet hand valve slowly, fill the valve and bleed
the air through test cock number 2, 3, and 4.
C. When the valve is filled, open the outlet hand valve
slowly and fill the remaining supply system. The initial
start-up procedure is now complete.
The reduced pressure principle device type backflow preventer
(Refer to Figure 11A &11B) consists of two primary chambers
with spring loaded check valves and a secondary chamber with
a spring loaded relief valve. This device prevents backflow by
opening and closing the check valves if the pressure from the
inlet side to the outlet side of the device varies.
1. Intermittent Discharge - Intermittent discharge of water
through the relief valve is fairly common and usually occurs
if there is inlet pressure fluctuations of more than 3 psi and
when the solenoid valve closes after a wash cycle.
2. Continuous Discharge - If there is continuous discharge
of water out the relief valve when the ventilator is not in a
wash cycle, do the following:
INLET HAND VALVE
FIGURE 11A
REDUCED PRESSURE PRINCIPLE DEVICE
BACKFLOW PREVENTER
RP DEVICE - INITIAL START UP
OUTLET HAND VALVE
A. Leave the inlet hand valve open and close the outlet
hand valve. If there is still continuous discharge it
indicates that foreign material is preventing the first
check valve from closing. If flushing will not clear the
unit, remove and clean the first check valve.
B. If there is continuous discharge of water out of the
relief valve during a wash cycle, there is foreign
material preventing complete closing of the relief
valve. Flushing the relief valve may correct this condi
tion.
Repeat procedure if necessary. If flushing does not stop
discharge with flow through the device, remove and clean relief
valve.
In no case should the relief valve outlet port be plugged, closed
off or restricted.
This device should be inspected occasionally for continual
discharge from the relief valve, which indicates a need for
maintenance. It is recommended that the RP device be
inspected and tested once a year.
NOTE: Some regulations require annual inspection and test-
ing by a company certified to perform such duties.
See Instruction Manual IS-TK-DP, obtainable from your Watts
installer or distributor. For the name of your nearest installer or
distributor, call Watts Regulator at (978) 688-1811.
REDUCED PRESSURE PRINCIPLE DEVICE
BACKFLOW PREVENTER
20
FIGURE 11B