BMC Heat Pump GTA3600UD1AA User Manual

GTLS-03-1

3' Line Set

1.2

3

4.2

GTLS-15-1

15' Line Set

6

15

21

GTLS-25-1

25' Line Set

10

25

35

GTLS-35-1

35' Line Set

14

35

49

GTLS-50-1

50' Line Set

20

50

70

Manual 2100-537

I

 

Page 

42 of 54

All supplied line sets with threaded refrigerant connections 

are factory evacuated and charged with R-410A refrigerant 

at the quantity required to optimize system performance.  

Refer to Table 9 to see this charge quantity if you need to 

reprocess the charge due to repairing damage or replacement 

of a defective component.
For those using Stub Kits GTLS-SK2-1 or GTLS-SK4-1, 

you will first need to braze up both ends of your line set 

(to the point that it is sealed).  Ports are provided on the 

GTLS-SK*-1 kits so that you can pull a vacuum on the 

line set and pre-charge with refrigerant before screwing on 

the refrigerant fittings onto the pre-charged condenser and 

evaporator (if using one with threaded connectors).     
For charge quantity, use Table 9 as a good general reference 

to the required R-410A refrigerant required based upon your 

line set length.  Or, you can specifically measure your line 

set length, and add 1.4 ounces of R-410A refrigerant per 1' 

of line set length.

  1.  Coat all mating surface, including o-rings, with    

    R-410A refrigerant oil (Polyol Ester).
  2.  Attach female fittings to coil/condensing unit portion  

    by hand-threading initially.  Be careful not to cross- 
   

.  For the pre-manufactured 3' line  

    set used with a vertical (stacked) configuration, the  

    fittings should be threaded simultaneously.  Again, be  
   

.

  3.  Final torque should be achieved.  Use the appropriate  

    size wrench in conjunction with a second (backing)  

    wrench to ensure that fittings do not spin or twist on  

    the copper refrigerant lines.  Use the following torque  

   rates:
      3/8" Lineset – 22-25 ft. lbs. (30-35 Nm)
      7/8" Lineset – 44-47 ft. lbs. (60-65 Nm)

The correct R-410A charge is shown on the unit rating 

plate (including adders for the various line set lengths).  

Reference Figure 21 to validate proper system operation.  

However, it is recommended that if incorrect charge is 

suspected, the system refrigerant be reclaimed, evacuated, 

and charged to nameplate charge quantity and type 

(including necessary charge adjustment for the installed line 

set length).
The nameplate charge quantity is optimized for thermal 

performance and efficiency throughout all modes of 

operation.