Instruction manual
32
Flow Regulation —
Flow regulation can be accom-
plished by two methods. Most water control valves have a flow
adjustment built into the valve. By measuring the pressure drop
through the unit heat exchanger, the flow rate can be deter-
mined. See Tables 17-19. Adjust the water control valve until
the flow of 1.5 to 2 gpm is achieved. Since the pressure con-
stantly varies, two pressure gages may be needed in some
applications.
An alternative method is to install a flow control device.
These devices are typically an orifice of plastic material de-
signed to allow a specified flow rate that are mounted on the
outlet of the water control valve. Occasionally these valves
produce a velocity noise that can be reduced by applying some
back pressure. To accomplish this, slightly close the leaving
isolation valve of the well water setup.
Flushing —
Once the piping is complete, units require final
purging and loop charging. A flush cart pump of at least 1.5 hp
is needed to achieve adequate flow velocity in the loop to purge
air and dirt particles from the loop. Flush the loop in both direc-
tions with a high volume of water at a high velocity. Follow the
steps below to properly flush the loop:
1. Verify power is off.
2. Fill loop with water from hose through flush cart before
using flush cart pump to ensure an even fill. Do not allow
the water level in the flush cart tank to drop below the
pump inlet line to prevent air from filling the line.
3. Maintain a fluid level in the tank above the return tee to
avoid air entering back into the fluid.
4. Shutting off the return valve that connects into the flush
cart reservoir will allow 50 psi surges to help purge air
pockets. This maintains the pump at 50 psi.
5. To purge, keep the pump at 50 psi until maximum pump-
ing pressure is reached.
6. Open the return valve to send a pressure surge through
the loop to purge any air pockets in the piping system.
7. A noticeable drop in fluid level will be seen in the flush
cart tank. This is the only indication of air in the loop.
NOTE: If air is purged from the system while using a 10 in.
PVC flush tank, the level drop will only be 1 to 2 in. since liq-
uids are incompressible. If the level drops more than this,
flushing should continue since air is still being compressed in
the loop. If level is less than 1 to 2 in., reverse the flow.
8. Repeat this procedure until all air is purged.
9. Restore power.
Antifreeze may be added before, during or after the flushing
process. However, depending on when it is added in the
process, it can be wasted. Refer to the Antifreeze section for
more detail.
Loop static pressure will fluctuate with the seasons. Pres-
sures will be higher in the winter months than during the warm-
er months. This fluctuation is normal and should be considered
when charging the system initially. Run the unit in either heat-
ing or cooling for several minutes to condition the loop to a
homogenous temperature.
When complete, perform a final flush and pressurize the
loop to a static pressure of 40 to 50 psi for winter months or 15
to 20 psi for summer months.
After pressurization, be sure to remove the plug from the
end of the loop pump motor(s) to allow trapped air to be
discharged and to ensure the motor housing has been flooded.
Be sure the loop flow center provides adequate flow through
the unit by checking pressure drop across the heat exchanger.
Compare the results to the data in Tables 17-19.
Table 17 — 50RHC,RVC Coaxial
Water Pressure Drop
*Vertical unit only.
Table 18 — 50RHR,RVR Coaxial
Water Pressure Drop
*Size 006 available in 50RHR units only.
To avoid possible injury or death due to electrical shock,
open the power supply disconnect switch and secure it in
an open position before flushing system.
UNIT
50RHC,RVC
GPM
WATER TEMPERATURE (F)
60 F 80 F 90 F
Pressure Drop (psi)
018
2.3 2.1 1.9 1.9
3.4 3.0 2.8 2.7
4.5 4.3 4.0 3.9
024
3.0 2.0 1.9 1.8
4.5 3.8 3.6 3.5
6.0 6.4 6.0 5.9
030
3.8 1.6 1.5 1.4
5.6 2.8 2.6 2.6
7.5 4.4 4.1 4.0
036
4.5 1.8 1.7 1.6
6.8 3.2 3.0 2.9
9.0 5.1 4.8 4.6
041*
5.3 1.0 0.9 0.9
7.9 2.2 2.1 2.0
10.5 4.0 3.8 3.7
042
5.3 1.0 1.0 0.9
8.0 2.7 2.8 2.8
11.0 5.8 8.2 5.0
048
6.0 1.2 1.2 1.1
9.0 2.9 2.7 2.7
12.0 5.3 5.0 4.8
060
7.8 4.4 4.1 4.0
11.3 7.6 7.1 6.9
18.0 11.5 10.8 10.5
UNIT
50RHR,RVR
GPM
WATER TEMPERATURE (F)
30 F 50 F 70 F 90 F
Pressure Drop (psi)
006*
0.8 0.8 0.8 0.7 0.7
1.1 1.2 1.1 1.0 1.0
1.5 2.0 1.9 1.8 1.7
009
1.1 1.2 1.1 1.0 0.9
1.7 1.7 1.6 1.5 1.4
2.2 3.5 3.2 3.0 2.8
012
1.5 2.8 2.6 2.4 2.3
2.3 6.0 5.6 5.2 4.9
3.0 9.6 9.0 8.3 7.9
015
1.8 2.5 2.3 2.1 2.0
2.6 4.8 4.5 4.1 3.9
3.5 8.1 7.6 7.0 6.6
019
2.3 1.9 1.7 1.6 1.5
3.4 3.4 3.1 2.9 2.7
4.5 6.6 6.2 5.7 5.4
024
3.0 2.0 1.9 1.7 1.6
4.5 4.2 3.9 3.6 3.4
6.0 7.0 6.5 6.0 5.7
030
3.8 1.4 1.3 1.2 1.2
5.5 2.4 2.3 2.1 2.0
7.5 3.9 3.7 3.4 3.2
036
4.5 1.1 1.1 1.0 0.9
6.8 2.1 2.0 1.9 1.8
9.0 3.5 3.3 3.0 2.9
042
5.3 1.4 1.3 1.2 1.2
7.9 2.9 2.7 2.5 2.3
10.5 4.6 4.2 3.9 3.7
048
6.0 2.1 1.9 1.8 1.7
9.0 3.9 3.7 3.4 3.2
12.0 6.4 5.9 5.5 5.2
060
7.5 2.9 2.7 2.5 2.4
11.3 5.7 5.3 4.9 4.7
15.0 9.4 8.7 8.1 7.7