Powers SH1430 2 Valve HiLo & DV - Manual (Page 3)

You must follow these procedures in order to properly adjust
your Hi/Lo System. You need flow greater than the minimum
shown in capacity table across the valve in order to set a
maximum temperature.
1. Close the low flow valve on the outlet of the low flow valve.
2. Open the ball valve at the discharge of the high flow valve.
3. Open enough fixtures to meet the minimum flow requirement
as per capacity table.
4. Set valve temperature. Refer to IS-P-LFMM430 & IS-P-
LFSH1430.
5. For "DV" skip to #6. For "HL" set the PRV as follows for a 15psi
differential.
a) Loosen the locknut at the top of the PRV. This must be all
the way out or you will be limiting the range of the adjust-
ment.
b) Adjust the PRV so the outlet pressure gauge reads 15psi
less than the supply pressure gauge. Turning the adjustment
screw counterclockwise will increase the differential across
the PRV (allowing the PRV to open later).
6. Close the ball valve at the discharge of the high flow valve
and open the low flow side ball valve by rotating the handle
fully counterclockwise.
7. Open enough fixtures to meet the minimum flow requirement
as per capacity table.
8. Set the temperature for the low flow valve. Refer to
IS-P-LFMM430 & IS-P-LFSH1430.
9. Open the ball valve at the discharge of high flow valve.
10. Open additional fixtures to create a 20psi differential
between supply and outlet pressure gauge.
11. When water is at desired outlet temperature, verify tem-
perature remains at set point.
12. Gradually start to close fixtures to verify that the tempera-
ture remains constant through the full range of flow.
13. For any problem, refer to Troubleshooting section of
the document or contact Powers' Technical Support
Department at 1.800.669.5430 or [email protected].
3
Set Up Procedure
n
What to look for if:
• Outlet temperature is too hot with low flow:
1. The maximum temperature of the low flow valve was not
properly set. Refer to Setup Procedure and reset the maxi-
mum temperature of the low flow valve.
2. The thermal actuator of the low flow valve is not working
properly. Replace accordingly to the appropriate technical
instructions (IS-P-LFSH1430 enclosed).
• Outlet temperature is too hot with a high flow:
1. The maximum temperature of a high flow valve was not
properly set. Refer to Setup Procedure and reset the maxi-
mum temperature of the high flow valve.
2. The thermal actuator of the high flow valve is not working
properly. Replace accordingly, IS-P-LFMM430 enclosed.
• Outlet temperature too low on low and high flow:
1. The hot water temperature is too low. You must have a sup-
ply temperature of at least 5°F (3°C) higher than the set tem-
perature. Re-adjust the hot water supply.
2. The checkstops on the hot side of the valve are not fully
open, or may be stuck due to liming. Open and clean check-
stops.
Troubleshooting
n
Supply Pressure Gauge Outlet Pressure Gauge
Lock Nut
Turn fully CCW
(counterclockwise)
before setting PRV.
Adjustment Screw
CW: Increases outlet pressure and
decreases differential across PRV or
CCW: Decreases outlet pressure and
increases differential across PRV.
3. The temperature has not been set properly on the small and/
or large valve. Refer to the Setup Procedure and reset the
valves.
• Outlet flow drops off:
1. The differential across the PRV is set too high, so the high
flow valve begins controlling the system too late and starves
the system. Refer to the Setup Procedure and decrease the
differential across PRV.
2. The checkstops on the high flow valves are not fully open or
are stuck due to liming. Open and clean checkstops.
3. The system pressure varies by more than 50% of the inlet
supply pressure.
• Outlet temperature cycles between hot and cold:
1. The differential across the PRV is set too low, so the high
flow valve begins controlling the system too early, and
therefore cycles (hunt for the set point). Refer to the Setup
Procedure and increase the differential across PRV.
2. The system pressure varies by more than 50% of the inlet
supply pressure.
Adjusting Individual High Flow and Low Flow Valves
n
See enclosed IS-P-LFMM430 and IS-P-LFSH1430.