NOTE: Perform all 22 steps before moving on to the next sec-
tion.
Steps 1 thru 22 explain how to set the thermostatic valve.
1. Close B3, B4 and B6.
2. Close D1 and D2.
3. Open B1, B2, B5, B7 and B8.
4. Connect hose to D2 and run to a drain.
5. Open D2 with a screwdriver and verify ow to drain is greater
than the minimum ow of the valve.
6. For system with an automatic balancing valve, adjust the knob
to full hot position (force the water through the hose).
7. If ow rate is less than the minimum ow, turn pump P1 on.
8. Let valve run until readings on inlet gauges T/P2 & T/P3 are
steady.
9. Close the low ow valve B8.
10. Adjust temperature of high ow mixing valve. Refer to IS-P-
MM430 and IS-P-SH1430.
11. For "HL" valves, set the PRV as follows; for a 15psi differential
for "DV" valves, skip to # 12.
a) Loosen the locknut at the top of the PRV. This must be all
the way or you will be limiting the range of adjustment.
b) Adjust the PRV so the outlet pressure gauge (top) reads
15psi less than the supply pressure gauge (bottom). Turning
the adjustment nut counterclockwise will increase the differ-
ential across the PRV (allowing the PRV to open later)
12. Close the ball valve at the discharge of the high ow valve,
B7 and open the low ow side ball valve B8.
13. Set the temperature of the low ow valve. Refer IS-P-
LM490-LM490-10 or IS-P-SH1430.
14. Open the ball valve at the discharge of high ow valve B7.
15. Increase total ow.
16. Verify temperature remains at set point.
17. Gradually start to close D2 to verify that the temperature
remains constant through the full range of ow.
18. Turn off pump.
19. Close B5 and open B4.
20. Open D1 to purge air out of recirculation line.
21. Close D1 when you begin to get water.
22. Open B6 and wait until T/P4 reaches the maximum recir-
culation temperature (must be less than the mixing valve
setpoint).
23. Skip to the type of recirculation below.
1. Flush all piping thoroughly before installing.
2. Check for leaks.
Prior to Installation n
1. Close D2
2. Open B3 fully and open C1 approximately 10%.
3. Allow time for recirculated water to travel around the loop.
4. If the temperature at the T/P4 begins falling, you will need to
open C1 another 10%.
5. If the temperature at T/P4 begins to rise, you will need to
close C1 by 5%.
6. Repeat steps 4 and 5 until the temperature at T/P4 is stable
(less than the set point of the mixing valve).
7. The system is now set.
Continuous Recirculation n
1. For systems with an automatic balancing valve, adjust the
knob to the full cold position (restrict the ow of water
through the hose to a trickle).
2. Slowly turn the automatic balancing valve's knob toward the
hot position until you just start to get water through the hose.
At this point, it is set to the temperature shown on T/P4.
3. Close D2.
4. Open B3.
5. The system is now set.
NOTE: For any problem, refer to Troubleshooting section of the
document or contact Powers’ Technical Support Department at
Continuous Recirculation with Automatic
Balancing Valve n
Set Up Procedure n
2
1. Close D2 and open B3.
2. Apply power to pump P1.
3. Set the Aquastat on and off temperatures.
4. With the recirculation temperature set to its maximum, the
pump/Aquastat will remain off until the temperature cools to
the low point.
5. Wait until the recirculation line cools to the low point.
6. Verify the pump turns on at this point.
7. Verify recirculation line heats back up and turns pump off at
the maximum setting from Step 3.
8. The system is now set.
Aquastat n
