Application Data; Wiring - Bryant 38MURA Manual

38MURA: Product Data

APPLICATION DATA

Unit Selections
Select equipment that either matches or supports slightly more than the
anticipated peak load. This provides better humidity control, fewer unit
cycles, and less part-load operation.
For units used in spaces with high sensible loads, base equipment
selection on unit sensible load, not on total anticipated load. Adjust for
anticipated room wet bulb temperature to avoid undersizing the
equipment.
Unit Mounting (Outdoor)
Refer to the unit's installation instructions for further details.
Unit leveling - For reliable operation, units should be level in all planes.
Clearance - Minimum clearance (see Fig. 5 — on page 8 ) must be
provided for airflow. The condensing units are designed for free-flow
application. Air inlets and outlets should not be restricted.
Unit location - A location which is convenient to installation and not
exposed to strong winds. A location that can bear the weight of the
outdoor unit and where the outdoor unit can be mounted in a level
position.
Do not install the indoor or outdoor units in a location with special
environmental conditions. For those applications, contact your sales
representative.
System Operating Conditions
OPERATING RANGE MIN/MAX °F / °C
All High Heat Units:
• Cooling: -22/130 (-30/55)
• Heating: -22/86 (-30/30)
Regular Heat Units:
• Cooling: 5/130 (-15/55)
• Heating: -5/86 (-20/30)
NOTE: Without intervention, the unit may continue to run at
temperatures outside of the specified operating
temperatures. However, operation outside of the
specified temperature range may result in decreased
performance and may cause damage to the unit.
METERING DEVICES
The outdoor unit has an electronic expansion valve to manage the
refrigerant flow of the connected fan coil.
DRAIN CONNECTIONS
Install drains to meet the local sanitation codes.
REFRIGERANT LINES
General refrigerant line sizing:
1. The outdoor units are shipped with a full charge of R410A refrigerant.
All charges, line sizing, and capacities are based on runs of 25 ft. (7.6
m). For runs over 25 ft. (7.6 m), add 0.69 oz/ft (65 g/m) of refrigerant
charge.
2. Refrigerant lines should not be buried in the ground. If it is
necessary to bury the lines, do not bury more than 36-in (914 mm).
Provide a minimum 6-in (152 mm) vertical rise to the service valves
to prevent refrigerant migration.
3. Insulate the suction line with a minimum 3/8-in (10 mm) wall
thermal pipe insulation. Follow local codes.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4. Special consideration should be given to isolating the
interconnecting tubing from the building structure. Isolate the tubing
so vibration or noise is not transmitted into the structure.
CAUTION
It is REQUIRED to flow Nitrogen while brazing the line set or line
set adapter(s) for these condensing units.

WIRING

All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. Use Electrical Data table
MCA (minimum circuit amps) and MOCP (maximum over current
protection) to correctly size the wires and the disconnect fuse or breakers
respectively.
Power wiring
1. Remove the electric cover of the outdoor unit.
2. Connect the fork terminal to the terminals.
3. Match the wire labels with the labels on the terminal block.
4. Firmly screw the fork terminal of each wire to its corresponding
terminal.
5. Insulate unused wires with electrical tape. Keep them away from any
electrical or metal parts.
6. Reinstall the cover of the electric control box
Fig. 1 —Remove Electrical Cover
TO POWER SOURCE
Fig. 2 —Match Fork Terminal to Terminal Labels
82
Cover
Screw
L1 L2