iAIRE, LLC
iAIRE
OM manual
144
5
F. Metering Device — Long Line Cooling
In current equipment, all indoor units use a hard--shutoff TXV for metering in the cooling mode. This provides adequate refrigerant
migration protection for all cooling applications.
G. Piston Sizing — Heat Pumps Only
An AccuRater
™
(fixed orifice) is used for refrigerant metering in the heating mode. This fixed expansion device must be changed from
the factory--supplied AccuRater
™
based on indoor/outdoor vertical separation and system capacity. For horizontal applications up to
200 ft (61 m) linear length and 250 ft (76 m) total equivalent length, no heating piston change is necessary.
When sizing the heating piston for installations where the outdoor unit is below the indoor unit, use Table 10. When outdoor unit is
located above indoor unit, use Table 13.
Example: The factory supplied AccuRater
™
for a single--stage 3--ton heat pump is a number 57. A system is installed with 200
equivalent ft of line set. Approximately 60 ft (18.3 m) is horizontal and the outdoor unit is 140 ft (42.7 m) above the indoor unit. Table
10 shows the AccuRater
™
piston change to be +6. The new piston size is 57 + 6 = 63. If a 63 is not produced, round up to the next
larger available piston size.
On the same heat pump, if the outdoor unit was located 49 ft (14.9 m) below the indoor unit, Table 10 shows the piston change to be 57
-- 2 = 55. If a 55 piston is not produced, round up to the next available size.
H. Liquid Line Solenoid — Long Line Heat Pump Heating
Since AccuRater
™
do not provide off--cycle refrigerant migration protection in the heating mode, a liquid line solenoid is required for
single--stage and two--stage heat pump long line applications. Bi--flow solenoid valves provide flow control protection only in the
direction of the arrow molded into the valve. The arrow must point toward the outdoor unit for off--cycle refrigerant control in the
heating mode. The arrow shows the direction of flow control. The solenoid should be installed within 2 ft. of the outdoor unit. The
liquid line solenoid kit number for a heat pump is KHALS0401LLS.
NOTE: Equivalent length of the liquid line solenoid should be added to the total equivalent length of the tubing. See Table 2.
I. Charging Information
Use subcooling as the primary method for charging longline applications. Outdoor units are pre--charged for 15 ft (4.6 m) of 3/8 liquid
line. When using different length diameter liquid lines, charge adjustments are required. See Table 5 for charge adjustments required.
The charge adjustment will depend on the liquid line diameter used. See unit installation instructions for proper charging procedure.
For all long line applications, pressure drop and subcooling loss become a concern. In these applications, a minimum of 10
_
_
F (5.6
_
_
C)
of subcooling is required for all liquid line diameters to ensure no refrigerant flashing occurs before the TXV metering device.
Systems should be charged to 10
_
subcooling or the rating plate subcooling, whichever is greater.
The amount of factory--charge can be found on the unit rating plate or in the Product Data literature. Long line applications do not
require additional oil charge.
Summary of Contents for ultraDRY
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Page 198: ...iAIRE LLC iAIRE OM manual 198 15 APPENDIX B Heatco Application Guide ...
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Page 215: ...iAIRE OM manual iAIRE LLC 215 APPENDIX L UPC BACNET INSTALLATION ...
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