36
G e o t h e r m a l H e a t i n g a n d C o o l i n g
Trilogy
®
Variable
(VE) Series IOM - 60Hz HFC-410A
C r e a t e d : 4 O c t o b e r, 2 0 1 9
Unit Start-Up and Operating Conditions
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CAUTION!
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CAUTION!
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CAUTION!
To avoid equipment damage, DO NOT
leave system filled in a building without heat during the
winter unless antifreeze is added to the water loop. Heat
exchangers never fully drain by themselves and will
freeze unless winterized with antifreeze.
CAUTION!
Verify that ALL water valves are open and
allow water flow prior to engaging the compressor. Freez-
ing of the heat exchanger or water lines can permanently
damage the heat pump.
Unit and System Checkout
BEFORE POWERING SYSTEM, please check the following:
UNIT CHECKOUT
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Shutoff valves: Insure that all isolation valves are open.
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Line voltage and wiring: Verify that voltage is within
an acceptable range for the unit and wiring and fuses/
breakers are properly sized. Verify that low voltage wiring
is complete.
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Unit control transformer: Insure that transformer has the
properly selected voltage tap. Residential 208-230V units
are factory wired for 230V operation unless specified
otherwise.
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Loop/water piping is complete and purged of air. Water/
piping is clean.
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Antifreeze has been added if necessary.
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Entering water and air: Insure that entering water and air
temperatures are within operating limits of Tables 10a
and 10b.
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Low water temperature cutout: Verify that low water
temperature cut-out is properly set.
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Unit fan: Manually rotate fan to verify free rotation and
insure that blower wheel is secured to the motor shaft.
Be sure to remove any shipping supports if needed.
DO NOT oil motors upon start-up. Fan motors are pre-
oiled at the factory. Check unit fan CFM selection and
compare to design requirements.
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Condensate line: Verify that condensate trap is installed
and pitched.
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Unit air coil and filters: Insure that filter is clean and
accessible. Clean air coil of all manufacturing oils.
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Unit controls: Verify that EXM field selection options are
properly configured. Low voltage wiring is complete.
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Blower CFM and Water ∆T are properly configured.
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Service/access panels are in place.
SYSTEM CHECKOUT
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System water temperature: Check water temperature
for proper range and also verify heating and cooling set
points for proper operation.
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System pH: Check and adjust water pH if necessary to
maintain a level between 6 and 8.5. Proper pH promotes
system longevity (see Table 5).
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System flushing: Verify that all air is purged from the
system. Air in the system can cause poor operation or
system corrosion. Water used in the system must be
potable quality initially and clean of dirt, piping slag,
and strong chemical cleaning agents. Some antifreeze
solutions may require distilled water.
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Internal Flow Controller: Verify that it is purged of air and
in operating condition.
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System controls: Verify that system controls function and
operate in the proper sequence.
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Low water temperature cutout: Verify that low water
temperature setting is appropriate for the application.
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Miscellaneous: Note any questionable aspects of
the installation.
Unit Start-up Procedure
1. Ensure all valves are adjusted to their full open position.
Ensure line power to the heat pump is on.
2. Room temperature should be within the minimum-
maximum ranges of listed in the unit IOM. During start-
up checks, loop water temperature entering the heat
pump should be between 30°F [-1°C] and 95°F [35°C].
3. It is recommended that Trilogy units be first started in
the heating mode, when possible. This will allow liquid
refrigerant to flow through the filter-drier before entering
the EEV, allowing the filter-drier to catch any debris that
might be in the system before it reaches the EEV.
4. Place the unit in Manual Operation (MENU > SETTINGS
> INSTALLATION SETTINGS > SERVICE MODE > VE
MODEL > MANUAL OPERATION).
5. While in the manual operation mode, turn on the blower
by setting the ECM Target Airflow to a nominal amount
(MENU > SETTINGS > INSTALLATION SETTINGS >
SERVICE MODE > VE MODEL > MANUAL OPERATION
> ECM TARGET AIRFLOW).
a. Verify the blower is running and that air is moving
appropriately through the duct system.
b. Verify that the loop pump is running.
c. Set the unit operating mode to Heating (MENU >
SETTINGS > INSTALLATION SETTINGS > SERVICE
MODE > VE MODEL > MANUAL OPERATION >
OPERATING MODE).
NOTE: The compressor will not start if the blower
and pump are not operating at appropriate levels.
d. Check for vibration, noise, and water leaks
e. Check for warm air delivery at the supply air grilles
within a few minutes after the unit has begun to
operate and that the loop water temperature drop is
within normal range.
f. Allow unit to run 15 minutes so that it reaches a
semi-steady state.
NOTE: Allow three (3) minutes between tests for pressure to
equalize before beginning cooling test.
