Antifreeze; Application Considerations; Well Water Systems - Bosch LV009 Installation And Maintenance Manual

20 | Application Considerations

After pressurization, be sure to remove the plug from the
end of the loop pump motor 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.

Antifreeze

In areas where entering loop temperatures drop below
°
40 F or where piping will be routed through areas
subject to freezing, antifreeze is needed.
Alcohols and glycols are commonly used as antifreeze
agents. Freeze protection should be maintained to 15
below the lowest expected entering loop temperature.
For example, if the lowest expected entering loop
°
temperature is 30 F, the leaving loop temperature would
° °
be 22 F to 25 F. Therefore, the freeze protection should
° ° ° °
be at 15 F (30 F-15 F=15
NOTICE: All alcohols should be pre-mixed
and pumped from a reservoir outside the
building or introduced under water level to
avoid build up of fumes.
Antifreeze concentration should be checked from a well
mixed sample using a hydrometer to measure specific
gravity.
Freeze Protection Selection
°
The 26 F FP1 factory setting (water) should be used to
avoid freeze damage to the unit.
Once antifreeze is selected. the (FP1 jumper) should be
clipped on the control to select the low temperatures
°
(antifreeze 15 F) set point to avoid nuisance faults.
APPLICATION CONSIDERATIONS

Well Water Systems

Copper is adequate for ground water that is not high in
mineral content. Should your well driller express
concerns regarding the quality of the well water
available or should any know hazards exists in your area,
we recommend proper testing to assure the well water
quality is suitable for use with water source equipment.
(See water quality table on page #21) in conditions
anticipating moderate scale formation or in brackish
water a cupro-nickel heat exchanger is recommended. In
well water applications water pressure must always be
maintained in the heat exchanger. This can be
accomplished with a control valve or a bladder type
expansion tank. When using a single water well to supply
both domestic water and the heat pump care must be
taken to ensure that the well can provide sufficient flow
for both. In well water applications a slow closing
solenoid valve must be used to prevent water hammer.
Solenoid valves should be connected across Y1 and C1
on the interface board for all. Make sure that the VA
draw of the valve does not exceed the contact rating of
the thermostat.
8 733 944 336 (2016/09)
F).
Subject to change without prior notice
°
F
1. Flex Duct Connection.
2. Low Voltage Control Connection
3. Vibration Pad
4. Ball Valves
5. Solenoid Valve Slow Closing
6. Condensate Drain Connection
7. Drain Valves
8. Hose Kits (optional)
9. Pressure Tank (optional)
10. P/T Ports (optional)
11. Line Voltage Connection
12. Electric Heater Line Voltage Disconnect
13. Unit Line Voltage Disconnect
LV Heat Pump Series
Figure # 15
LV Heat Pump Series