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LV Heat Pump Series
Unit Start Up Cooling Mode
1.
Adjust the unit thermostat to the warmest position.
Slowly reduce the thermostat position until the
compressor activates.
2.
Check for cool air delivery at unit grille a few
minutes after the unit has begun to operate.
3.
Verify that the compressor is ON and that the water
flow rate is correct by measuring pressure drop
through the heat exchanger using P/T plugs. Check
elevation and cleanliness of the condensate lines;
any dripping could be a sign of a blocked line. Be
sure the condensate trap includes a water seal.
4.
Check the temperature of both supply and
discharge water.
5.
Check air temperature drop across the coil when
compressor is operating. Air temperature drop
should be between 15
Unit Start Up Heating Mode
Oper
Operate the unit in heating cycle after checking the
cooling cycle. Allow 5 minutes between tests for the
pressure or reversing valve to equalize.
1.
Turn thermostat to lowest setting and set
thermostat switch to HEAT position.
2.
Slowly turn the thermostat to a higher temperature
until the compressor activates.
3.
Check for warm air delivery at the unit grille within a
few minutes after the unit has begun to operate.
4.
Check the temperature of both supply and
discharge water. If temperature is within range,
proceed. If temperature is outside the range, check
the heating refrigerant pressures.
5.
Once the unit has begun to run, check for warm air
delivery at the unit grille.
6.
Check air temperature rise across the coil when
compressor is operating. Air temperature rise
should be between 20
load.
7.
Check for vibration, noise and water leaks.
Flow Regulation
Flow regulation can be accomplished 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
determined. Adjust the water control valve until the
desired flow is achieved. Since the pressure constantly
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
designed to allow a specified flow rate that are mounted
on the outlet of the water control valve. Occasionally
these valves produce a flow noise that can be reduced
by applying some back pressure. To accomplish this,
slightly close the leaving isolation valve of the well water
setup.
LV Heat Pump Series
o
o
and 25
F.
°
°
F and 30
F after 15 minutes
WARNING: Open the disconnect switch and
secure it in an open position before flushing
the system.
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
to purge air and dirt particles from the loop. Flush the
loop in both directions with a high volume of water at a
high velocity.
Follow the steps below to properly flush the loop:
1.
Verify that the power is off.
2.
Fill loop with water from the 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 entering back into the fluid.
4.
Shutting off the return valve that connects into the
flush cart reservoir it will allow 50 psig surges to
help purge air pockets. This maintains the pump at
50 psig.
5.
To purge, keep the pump at 50 psig until maximum
pumping 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.
If air is purged from the system while using a 10 inch
PVC flush tank, the level drop will only be 1 to 2
inches, since liquids 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 inches, 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.
Pressures will be higher in the winter months than
during the warmer months. this fluctuation is normal
and should be considered when charging the system
initially. Run the unit in either heating 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 psig for winter
months or 15 to 20 psig for summer months.
Start-Up | 19
8 733 905 683 (2016/09)
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