Install Accessories - Carrier 25VNA Installation Instructions Manual

Step 10 -- Install Accessories
There are no refrigeration circuit or electrical accessories required
or available for installation within the unit. External to the unit, the
same accessories such as the liquid line solenoid, support feet,
snow rack, wind baffle etc., are available on other Carrier units can
also be used on this line of product. Refer to the individual
Installation Instructions packaged with kits or accessories when
installing.
Step 11 -- Start-Up
[]NIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
Observe the following:
1. Do not overcharge system with refrigerant.
2. Do not operate unit in a vacuum or at negative pressure.
3. Do not disable low pressure switch
4. Dome temperatures may be hot.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal iniury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant.
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent
refrigerant to the atmosphere. Recover during system
repair or final unit disposal.
Follow these steps to properly start up the system:
1. After system is evacuated, close the disconnects to energize
the ID and OD units to assess the user interface (UI), Keep
system in off mode. Under the Advanced function menu,
assess the REQUIRED CHARGE CALCULATION screen.
Enter the lineset length and vapor tube diameter. The user
interface (UI) will now display the required charge adjust-
ment (see Fig. 9) for the lineset and an adjustment for a
large indoor coil if recognized as such by the UI.
2. Add or remove the required charge adjustment for lineset
length to liquid service valve.
Note: If lineset is less than 15 feet (-9.4°C), charge re-
moval may be necessary.
3. Fully open liquid and vapor service valves.
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Fig. 9 - Required Charge Adjustment Calculated in UI
4. Set User Interface to operate cooling in CHARGING mode.
Charging mode operates system compressor speed and fan
speeds to proper conditions to check the refrigerant charge.
NOTE: Do not check charge in a mode other than CHARGING.
5. Wait for the specified stabilization time, depending on
lineset length. Compare subcooling at liquid line service
valve to Liquid Line Subcooling Target as shown CHAR-
GING screen (LiqLin SC TGT) (see Fig. 10).
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Step 12 -- System Functions And Sequence Of
Operation
The 25VNA models utilize an Infinity Communicating User
Interface (UI). With a call for cooling, the outdoor fan and
compressor are energized to run at lowest cooling demand. If this
does not satisfy cooling demand, the system will ramp up in stages
until it satisfies the demand. After coping with the higher demand,
the unit returns to lower capacity operation until the demand is
satisfied or until an increase in demand.
When all demand is satisfied, the compressor will shut off. As the
unit operates at lower c@acity, system v@or (suction) pressure will
be higher than it is during a standard single-stage system operation
or during a higher capacity operation.
When the outdoor ambient is more the 100°F (37.8°C), the
outdoor fan will continue to run for one nfinute after compressor
shuts off. This reduces pressure differential for easier starting in
the next cycle.
The conventional thermostat inputs is designed to work for
emergency operation only. Connections are Y, O and C. The
system will only operate at maximum capacity, heating or cooling.
The user interface (UI) displays the operation mode and fault codes
as specified in the troubleshooting section. See Table 5 for codes
and definitions.
NOTE: Only one code will be displayed on the outdoor unit
control board (the most recent, with the highest priority). The
latest codes are stored and can be access via the UI.