Dealer Service Bulletin - Puron AC Alternate Liquid Lines Product Marketing Bulletin Release Announcement
Number: DSB 08-0042
Product Bulletin Number: 101-08-48
This bulletin is an informational document to announce the release of the following Marketing Product Bulletin number 101-08-48 regarding alternate liquid lines on AC Puron units. As stated, if considering R22 alternate liquid lines refer to Technical Bulletin TB 98-02.
101-08-48 Alternate Liquid Lines on Residential Puron® refrigerant Split System Air Conditioners
Carrier has evaluated the use of 1/4” and 5/16” liquid lines for Puron refrigerant air conditioner cooling-only systems. Puron refrigerant lends itself well to the use of smaller liquid lines in either retrofit applications with existing linesets, or new systems when cost saving is a priority. One quarter inch or five sixteenths inch liquid lines may be used for cooling-only applications using a TXV as the metering device per limitations on Tables 2 and 3 on page 2 of this bulletin.
There are several benefits to the use of alternate liquid lines. These include lower install cost for replacement jobs when the existing linesets are not accessible for changeout, lower lineset cost for new installations, less refrigerant cost for longer linesets, and increased reliability due to less total refrigerant in the system. For examples of potential cost savings, see page 3 of this bulletin.
For R-22 systems, Technical Bulletin TB 98-02 gives alternate liquid line data and is still active for current R-22 models. An Investigation is underway to update data for R22 systems.
Limitations for alternate liquid lines are based on total equivalent line length and elevation difference between indoor and outdoor units. Use the appropriate table depending on whether the outdoor unit is above or below the indoor unit.
There are no capacity and efficiency differences between systems using 3/8” liquid lines and the listed alternate liquid lines at the equivalent lengths shown, provided a TXV metering device is used. The alternate liquid line sizes recommended in this bulletin follow the capacity loss charts in the Product Data and, when used with a TXV, achieve the same SEER ratings as systems with 3/8 liquid lines. The capacity losses shown in the Product Data are related to changes in suction line diameter and equivalent length.
Outdoor units are factory charged for 15 ft of 3/8 liquid line and include charge for the filter drier. Charge must be adjusted according to the lineset being used. See Table 1 for appropriate charge adjustments and examples for correct charge adjustment.
NOTE: Due to the added complexity of heat pump systems, further evaluation is needed before releasing guidelines for heat pump systems.
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