English
PRS-DIAL Pressure Regulating Module
Thank you for purchasing a Rain Bird
PRS-DIAL pressure regulating module to
optimize the performance of your irrigation
system. This product automatically
maintains constant outlet pressure
regardless of inlet pressure fluctuations.
Proper operation requires inlet pressure
to be a minimum of 15 psi (1 bar) higher
than desired outlet pressure. This product
is designed for use with Rain Bird PGA, PEB,
PESB, PESB-R, EFB-CP and BPES commercial
valves. Much of the installation is done by
hand; elsewhere, an adjustable wrench and
pressure hose gauge are required.
As with all pressure regulators, this
product senses back pressure before
regulating outlet pressure. When opening
the valve, it is normal for outlet pressure
to momentarily exceed the desired set
pressure and then begin regulating outlet
pressure. This situation can be greatly
reduced by following the installation and
adjustment procedures below.
Notes:
1. For areas with very high pressure or
uneven terrain, install sprinklers with
PRS pressure regulating stems or
SAM check valves.
2. When inlet pressures exceed 100 psi
(6,9 bars), a pressure regulating master valve
or inline pressure regulator is suggested.
3. Rain Bird does not recommend using
the PRS-DIAL module for applications
outside the recommended flow ranges
(listed in Table 1).
Installation
Refer to Figure 1.
1. Turn off water supply to the valve and
turn flow control handle
A
clockwise
until closed.
2. Remove solenoid
B
and adapter
C
from bonnet
F
with an adjustable
wrench.
3. Remove the Schrader valve cap
D
.
4. Thread PRS-DIAL housing
E
into valve
bonnet
F
until hand tight.
5. Loosen slightly to align latch
G
between
ribs on plastic valves
H
or hole on brass
valves, then push down latch to snap in place.
6. Thread PRS-DIAL cartridge
I
into
housing until hand tight, then thread
adapter and solenoid into top of housing.
7. Keep the flow control handle closed,
then turn on water supply to the valve
and proceed with adjustment.
Troubleshooting
External Leaks.
Main cause is improper
o-ring seal between bonnet, cartridge,
adapter or solenoid.
1. Turn off water supply to the valve, then
unthread parts at the leak.
2. Wipe or blow parts clean, reassemble,
then turn on water supply and verify
proper function.
Internal Leaks.
Main cause is loose
solenoid. If tightening solenoid does not
fix the leak, proceed as follows:
1. Turn off water supply to the valve, then
remove solenoid and clean debris.
2. Unthread the PRS-DIAL and check the
rubber boot under the housing for tears
or debris.
3. Check inside the solenoid bowl for
damage to the white seat; a slight
impression on top is normal.
4. Clean all parts and reassemble,
then turn on water supply and verify
proper function.
Excess Vibration.
Main cause is excess
air in the line or operation outside
recommended flow ranges (see Table 1).
To purge the air, proceed as follows:
1. Keep water supply on.
2. PGA VALVES ONLY: remove solenoid and
let water flow for two minutes.
3. ALL OTHER VALVES: remove external
bleed screw and let water flow for
two minutes.
4. Open and close flow control handle a
few times to remove air trapped inside
the bonnet.
5. Reinstall parts, follow adjustment
procedures and verify proper function.
Schrader Valve.
Main cause of failure is
loose valve stem or seal failure causing
external leaking.
1. Check torque of valve stem and verify
that it is set at 3-5 in-lbs (0,3-0,6 Nm).
Turn clockwise until tight and proper
torque is achieved.
2. If the valve is still leaking, replace valve
stem and turn clockwise until tight and
proper torque is achieved.
Adjustment
Refer to Figure 1.
1. Remove the PRS-DIAL cap by pulling
away from the housing. Verify setting
is 100 psi (6,9 bars).
2. Attach pressure hose gauge to
Schrader valve
D
.
3. Turn solenoid counter-clockwise
1/4 turn to manually open the valve
or activate the solenoid from the
controller. Do not use external bleed.
4. Turn flow control handle
counter-clockwise until pressure gauge
indicates 15 psi (1 bar) above desired
downstream pressure.
5. Turn PRS-DIAL adjustment knob
J
until pressure gauge indicates the
desired outlet pressure, then replace
PRS-DIAL and Schrader valve caps.
6. Turn solenoid clockwise to close the
valve or deactivate the solenoid from
the controller.
Figure 1