Spec Sheet

38MHRC-01PD Specifications subject to change without notice. 15
APPLICATION DATA
Unit Selection
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
NOTE: Reference the product installation instructions for
more information.
Metering Devices
The outdoor unit utilizes a capillary tube to manage the connected fan
coil’s refrigerant flow.
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), review the Long Line
Applications section for the proper charge adjustments.
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. Both lines must be insulated. Use a minimum of 1/2−in. (12.7 mm)
thick insulation. Closed−cell insulation is recommended in all
long−line applications.
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.
Long Line Applications:
1. No change in line sizing is required.
2. Add refrigerant per the Additional Charge table.
OPERATING RANGE
MIN / MAX °F (°C)
Cooling Heating
Outdoor DB 0 ~ 122 (-17 ~ 50) 0 ~ 86 (-17 ~ 30)
ADDITIONAL CHARGE
Unit
Size
Total Line Length
ft. (m)
Additional Charge, oz/ft. FT (m)
Min Max
10-25
(3-9)
>25-82
(8-25)
>82-98
(25-30)
>98-164
(30-50)
9
10(3)
82(25)
None
0.16
12
18 98(30) 0.16
24 164(50) 0.32 0.32 0.32