Start-Up - Daikin Enfinity VFC Installation And Maintenance Manual

CAUTION
Units must be checked for water leaks upon initial water system
start-up. Water leaks may be a result of mishandling or damage
during shipping. Failure by the installing contractor to check for
leaks upon start-up of the water system could result in property
damage.
1 . Open all valves to full open position and turn on
power to the unit.
2 . Set the thermostat for "Fan Only" operation by
selecting "Off" at the system switch and "On" at the
fan switch. If "Auto" fan operation is selected, the
fan will cycle with the compressor.
3 . For those units that have two-speed motors,
reconnect for low speed operation if necessary
4 . Set thermostat to "Cool." If the thermostat is an
automatic changeover type, simply set the cooling
temperature to the lowest temperature. On manual
changeover types, additionally select "Cool" at the
system switch.
Again, many units have time delays help protect the
compressor(s) against short cycling.
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After a few minutes of operation, check the
discharge grilles for cool air delivery. Measure
the temperature difference between entering and
leaving water. It should be approximately 1-1⁄2
times greater than the heating mode temperature
difference. For example, if the cooling temperature
difference is 15°F (8°C), the heating temperature
difference should be 10°F (5°C).
Without automatic flow control valves, target a
cooling temperature difference of 10°F to 14°F (5°C
to 8°C). Adjust the combination shutoff/balancing
valve in the return line to a water flow rate which will
result in the 10˚F to 14°F (5°C to 8°C) difference.
5 .
Set thermostat to "Heat." If the thermostat is the
automatic changeover type, set system switch to
the "Auto" position and depress the heat setting to
the highest temperature. Some units have built-in
time delays which prevent the compressor from
immediately starting. With most control schemes,
the fan will start immediately. After a few minutes of
compressor operation, check for warm air delivery
at discharge grille. If this is a "cold building" start-
up, leave unit running until return air to the unit is at
least 65°F (18°C).
23 Enfinity Vertical Water Source Heat Pumps • IM 930-6
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