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Table Of Contents
- Installation Instructions
- SAFETY CONSIDERATIONS
- GENERAL
- 1. Locate unit away from windows, patios, decks, etc. where unit operation sound may disturb customer.
- 2. Ensure that vapor and liquid tube diameters are appropriate for unit capacity.
- 3. Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.
- 4. Leave some slack between structure and unit to absorb vibration.
- 5. When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon-based caulk. (See Fig. 1.)
- 6. Avoid direct tubing contact with water pipes, duct work, floor joists, wall studs, floors, and walls.
- 7. Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing (see Fig. 1).
- 8. Ensure that tubing insulation is pliable and completely surrounds vapor tube.
- 9. When necessary, use hanger straps which are 1 in. (25.4 mm) wide and conform to shape of tubing insulation. (See Fig. 1.)
- 10. Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation.
- Fig. 1 – Piping Installation
- Installation
- Check Equipment and Job Site
- Install on a Solid, Level Mounting Pad
- Clearance Requirements
- Operating Ambient
- Make Piping Connections
- Fig. 2 – Tiedown Knockout Locations
- Outdoor Unit Connected to Factory Approved Indoor Unit
- Refrigerant Tubing Connection Outdoor
- Sweat Connection
- Install Liquid-Line Filter Drier Indoor
- Evacuate Refrigerant Tubing and Indoor Coil
- Deep Vacuum Method
- Final Tubing Check
- Installing with Indoor Piston
- Fig. 5 – Indoor (Cooling) Piston
- 1. Operate unit a minimum of 15 minutes before checking charge.
- 2. Measure liquid service valve pressure by attaching an accurate gage to service port.
- 3. Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil.
- 4. Refer to unit rating plate for required subcooling temperature.
- 5. Refer to Table 2 - Rating Plate (required) Subcooling Temperature. Find the point where required subcooling temperature intersects measured liquid service valve pressure.
- 6. To obtain required subcooling temperature at a specific liquid line pressure, add refrigerant if liquid line temperature is higher than indicated or reclaim refrigerant if temperature is lower. Allow a tolerance of 3°F (1.7°C).
- Fig. 5 – Indoor (Cooling) Piston
- Units with Indoor Piston
- 1. Operate unit a minimum of 15 minutes before checking charge.
- 2. Measure suction pressure by attaching an accurate gage to suction valve service port.
- 3. Measure suction temperature by attaching an accurate thermistor type or electronic thermometer to suction line at service valve.
- 4. Measure outdoor air dry-bulb temperature with thermometer.
- 5. Measure indoor air (entering indoor coil) wet-bulb temperature with a sling psychrometer.
- 6. Refer to Table 3 - Superheat Charging - AC Only. Find outdoor temperature and evaporator entering air wet-bulb temperature. At this intersection, note superheat. Where a dash (--) appears on the table, do not attempt to charge system under these c...
- 7. Refer to Table 4 - Required Suction-Line Temperature. Find superheat temperature (from #6 above) and suction pressure. At this intersection, note suction line temperature.
- 8. If unit has a higher suction line temperature than charted temperature, add refrigerant until charted temperature is reached.
- 9. If unit has a lower suction line temperature than charted temperature, reclaim refrigerant until charted temperature is reached.
- 10. When adding refrigerant, charge in liquid form into suction service port using a flow-restricting device.
- 11. If outdoor air temperature or pressure at suction valve changes, charge to new suction line temperature indicated on chart.
- 12. Optimum performance will be achieved when the operating charge produces 10°F suction superheat at suction service valve with 95°F (35°C) outdoor ambient and 80°F (27°C) dry bulb (67°F / 19°C) wet bulb) indoor temperature (DOE “A” test ...
- Table 2 – Rating Plate (required) Subcooling Temperatures
- Table 3 – Superheat Charging - AC Only
- Table 4 – Required Suction-Line Temperature
- Make Electrical Connections
- Compressor Crankcase Heater
- Install Electrical Accessories
- Start-Up
- Follow these steps to properly start up system:
- 1. After system is evacuated, fully open liquid and vapor service valves.
- 2. Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow. Replace caps finger-tight and tighten with wrench an additional 1/12 turn.
- 3. Close electrical disconnects to energize system.
- 4. Set room thermostat at desired temperature. Be sure set point is below indoor ambient temperature.
- 5. Set room thermostat to COOL and fan control to ON or AUTO mode, as desired. Operate unit for 15 minutes. Check system refrigerant charge.
- 3-Phase Monitor
- Sequence of Operation
- Follow these steps to properly start up system:
- Check Charge
- Final Checks
- 1. Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub-through or wire pinching.
- 2. Ensure that all wiring and tubing is secure in unit before adding panels and covers. Securely fasten all panels and covers.
- 3. Tighten service valve stem caps to 1/12-turn past finger tight.
- 4. Leave Owner’s Manual with owner. Explain system operation and periodic maintenance requirements outlined in manual.
- 5. Fill out Dealer Installation Checklist and place in customer file.
- CARE AND MAINTENANCE
PA13*A, PA14NC, PA15NC, PA16N*: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a
vacuum of 500 microns and a vacuum gage capable of accurately
measuring this vacuum depth. The deep vacuum method is the most
positive way of assuring a system is free of air and liquid water. A tight
dry system will hold a vacuum of 1000 microns after approximately 7
minutes. See
Fig. 4
A95424
Fig. 4 – Deep Vacuum Graph
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor and
outdoor unit has not shifted during shipment. Ensure tubes are not
rubbing against each other or any sheet metal or wires. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Installing with Indoor Piston
Outdoor Unit Connected to Factory Approved Indoor Unit
Check piston size shipped with indoor unit to see if it matches required
indoor piston size. If it does not match, replace indoor piston with
correct piston size.
NOTE: Correct pistons are shipped with select outdoor units in the
accessory bag and are only for use in certain qualified and approved fan
coils, i.e. FB4C. (See Product Data for list of approved fan coils that use
accessory piston.)
The piston included with the FMA, FMC and FMU fan coils are unique
to those products and CANNOT be replaced with the piston shipped
with outdoor unit. Refer to the AHRI Directory to check if a certain
combination can use a piston or requires an accessory TXV.
When changing indoor piston, use a back−up wrench. Hand tighten hex
nut, then tighten with wrench 1/2 turn. Do not exceed 30 ft−lbs. The
indoor piston contains a Teflon ring (or seal) which is used to seat
against the inside of distributor body, and must be installed properly to
ensure proper seating. See
Fig. 5
A10342
Fig. 5 – Indoor (Cooling) Piston
Air Conditioner Applied as Replacement Component
If the air conditioner is installed as a replacement component in an
existing piston indoor system, the piston size in the indoor unit should be
changed to the size required for the air conditioner which can be found in
the Product Data
Units with Cooling Mode TXV
Units installed with cooling mode TXV require charging by the
subcooling method.
1. Operate unit a minimum of 15 minutes before checking charge.
2. Measure liquid service valve pressure by attaching an accurate gage
to service port.
3. Measure liquid line temperature by attaching an accurate thermistor
type or electronic thermometer to liquid line near outdoor coil.
4. Refer to unit rating plate for required subcooling temperature.
5. Refer to
Table 2 - Rating Plate (required) Subcooling Temperature.
Find the point where required subcooling temperature intersects
measured liquid service valve pressure.
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line temperature is
higher than indicated or reclaim refrigerant if temperature is lower.
Allow a tolerance of ?3°F (?1.7°C).
Units with Indoor Piston
Units installed with indoor pistons require charging by the superheat
method.
The following procedure is valid when indoor airflow is within ?21
percent of its rated CFM.
1. Operate unit a minimum of 15 minutes before checking charge.
2. Measure suction pressure by attaching an accurate gage to suction
valve service port.
3. Measure suction temperature by attaching an accurate thermistor
type or electronic thermometer to suction line at service valve.
4. Measure outdoor air dry-bulb temperature with thermometer.
5. Measure indoor air (entering indoor coil) wet-bulb temperature
with a sling psychrometer.
6. Refer to
Table 3 - Superheat Charging - AC Only. Find outdoor
temperature and evaporator entering air wet-bulb temperature. At
this intersection, note superheat. Where a dash (--) appears on the
table, do not attempt to charge system under these conditions or
refrigerant slugging may occur. Charge must be weighted in, adding
or removing 0.6 oz/ft of 3/8 liquid line above or below 15 feet
(4.6m) respectively (refer to
Table 6 and Table 7 for factory and
required refrigerant charge).
7. Refer to
Table 4 - Required Suction-Line Temperature. Find
superheat temperature (from #6 above) and suction pressure. At this
intersection, note suction line temperature.
8. If unit has a higher suction line temperature than charted
temperature, add refrigerant until charted temperature is reached.
9. If unit has a lower suction line temperature than charted
temperature, reclaim refrigerant until charted temperature is
reached.
10. When adding refrigerant, charge in liquid form into suction service
port using a flow-restricting device.
11. If outdoor air temperature or pressure at suction valve changes,
charge to new suction line temperature indicated on chart.
12. Optimum performance will be achieved when the operating charge
produces 10°F suction superheat at suction service valve with 95°F
(35°C) outdoor ambient and 80°F (27°C) dry bulb (67°F / 19°C)
wet bulb) indoor temperature (DOE “A” test conditions) at rated
airflow.