Bard GV27S1-A, Руководство по установке

Страница: 21 / 38

Manual 2100-510E
Page 21 of 38
SYSTEM START UP PROCEDURE FOR
GROUND WATER APPLICATIONS
1. Be sure main power to the unit is OFF at disconnect.
2. Set thermostat system switch to OFF, fan switch to
AUTO.
3. Move main power disconnect to ON. Except as required
for safety while servicing – DO NOT OPEN THE UNIT
DISCONNECT SWITCH.
4. Check system airflow for obstructions.
A. Move thermostat fan switch to ON. Blower runs.
B. Be sure all registers and grilles are open.
C. Move thermostat fan switch to AUTO. Blower
should stop.
5. Fully open the manual inlet and outlet valves.
6. Check water flow.
A. Connect a water flow meter to the drain cock
between the constant flow valve and the
solenoid valve. Run a hose from the flow meter
to a drain or sink. Open the drain cock.
B. Check the water flow rate through constant
flow valve to be sure it is the same as the unit
is rated for. (Example: 5 GPM for a GV27S1.)
C. When water flow is okay, close drain cock and
remove the water flow meter. The unit is now
ready to start.
7. Start the unit in cooling mode by moving the thermostat
switch to cool. Fan should be set for AUTO.
A. Check to see the solenoid valve opened.
8. Check the system refrigerant pressures against the
cooling refrigerant pressure table in the installation
manual for rated water flow and entering water
temperatures. If the refrigerant pressures do not match,
check for airflow problem that refrigeration system
problem.
9. Switch the unit to the heat mode by moving the
thermostat switch to heat. Fan should be set for AUTO.
A. Check to see the solenoid valve opened again.
10. Check the refrigerant system pressures against the
heating refrigerant pressure table in installation manual.
Once again, if they do not match, check for airflow
problems and then refrigeration system problems.
NOTE: If a charge problem is determined (high or low):
A. Check for possible refrigerant loss.
B. Discharge all remaining refrigerant from unit.
C. Evacuate unit down to 29 inches of vacuum.
D. Recharge the unit with refrigerant by weight.
This is the only way to insure proper charge.
WATER CORROSION
Two concerns will immediately come to light when
considering a water source heat pump, whether for ground
water or for a ground loop application: Will there be
enough water? And, how will the water quality affect the
system?
Water quantity is an important consideration and one
which is easily determined. The well driller must perform
a pump down test on the well according to methods
described by the National Well Water Association. This
test, if performed correctly, will provide information on the
rate of flow and on the capacity of the well. It is important
to consider the overall capacity of the well when thinking
about a water source heat pump because the heat pump
may be required to run for extended periods of time.
The second concern, about water quality, is equally
important. Generally speaking, if the water is not offensive
for drinking purposes, it should pose no problem for the
heat pump. The well driller or local water softening
company can perform tests which will determine the
chemical properties of the well water.
Water quality problems will show up in the heat pump in
one or more of the following ways:
1. Decrease in water flow through the unit.
2. Decreased heat transfer of the water coil (entering to
leaving water temperature difference is less).
There are four main water quality problems associated with
ground water. These are:
1. Biological Growth. This is the growth of microscopic
organisms in the water and will show up as a slimy
deposit throughout the water system. Shock treatment
of the well is usually required and this is best left up to
the well driller. The treatment consists of injecting
chlorine into the well casing and flushing the system
until all growth is removed.
2. Suspended Particles in the Water. Filtering will
usually remove most suspended particles (fine sand,
small gravel) from the water. The problem with
suspended particles in the water is that it will erode
metal parts, pumps, heat transfer coils, etc. So long as
the filter is cleaned and periodically maintained,
suspended particles should pose no serious problem.
Consult with your well driller.
3. Corrosion of Metal. Corrosion of metal parts results
from either highly corrosive water (acid water,
generally not the case with ground water) of galvanic
reaction between dissimilar metals in the presence of
water. By using plastic plumbing or dielectric unions,
galvanic reaction is eliminated. The use of corrosion
resistant materials such as the Cupronickel coil)
through the water system will reduce corrosion
problems significantly.