Nortek B6BM Series, Installation Instructions Manual

9

5. Connect the suction and liquid lineset tubes.

 cAutIoN:

It is recommended that a wet rag be wrapped 

around the suction line in front of the close off 

plate or the sensing bulb (if tXV is installed) 

before applying heat. Failure to keep components 

cool during brazing may result in structural 

damage, premature equipment failure, or possible 

personal injury.

6. Braze the individual connections with dry nitrogen flowing 

through the joints. 

NotE: This will prevent internal oxidation 

and scaling from occurring.

7. Wrap the refrigerant lines with pressure sensitive neoprene 

or other suitable material especially where the lines enter 

the opening in the sheet metal.

8. Evacuate the system of moisture and non-condensables 

to prevent low efficiency operation or damage to the unit. 

The suggested range of evacuation is 350 - 500 microns.

9. Charge the system with refrigerant. Refer to the outdoor 

unit installation manual for additional charging instructions.

10.  Check the system for leaks, including the lineset and the 

brazed joints.

11.  Replace all grommets and properly dispose of all removed 

parts.

condensate Drainage

 cAutIoN:

the air handler must be level to ensure proper 

condensate drainage. An unlevel installation may 

result in structural damage, premature equipment 

failure, or possible personal injury.

•  Methods  for  disposing  of  condensate  vary  according 

to local codes. Refer to local codes or authority having 

jurisidiction for restrictions and proper condensate disposal 

requirements.

•  The drain pan that is supplied with this air handler contains 

a primary and secondary drain fitting. The condensate is 

drained from the unit through two 3/4” female pipe fittings 

located on the front side of the unit as shown in 

Figure 9

.

•  The drain pan must be drained with field supplied tubing 

or pvc pipe and adequately trapped. Both drain tubes 

must have a minimum diameter of 3/4” and be trapped 

separately.

  IMPoRtANt: Failure to install a trap may result in 

condensation overflowing the drain pan, resulting in 

substantial water damage to surrounding area.

•  Route both lines to a suitable drain, avoiding sharp bends 

and pinching of the lines. The drain should maintain a 

minimum horizontal slope in the direction of discharge of 

not less than 1” vertical for every 10 ft of horizontal run.

•  If the air handler is located in or above a living space where 

damage may result from condensate overflow, an auxiliary 

drain pan shall be installed under the unit. A separate drain 

line should extend from the pan to a conspicuous point 

and serve as an alarm indicating that the primary drain 

is restricted. As an alternative to a separate drain line, 

an approved water level indicator or float switch device 

may be used to shut down the unit in the event water is 

detected in the auxiliary pan.

•  Install a single 5 inch trap in the condensate drain line as 

close to the coil as possible. Make sure that the top of the 

trap is below the bottom of the drain pan to prevent the 

condensate from overflowing the drain pan. 

NotE: There 

must be only one trap in the drain line. Using more than 

one trap may prevent drainage.

•  Prime the trap with water. Insulate the drain if it is located 

in an unconditioned space, and test the condensate line 

for leaks. Consult local codes for additional restrictions or 

precautions.

•  During  system  checkout,  inspect  the  drain  line  and 

connections to verify proper condensate drainage.

3/4” Adapter w/

3/4” dia. hose barb

3/4” minimum dia. 

PVC or flexible tubing

HORIZONTAL

UPFLOW

DOWNFLOW

NOTES:

1. The drain lines must maintain a downward slope to ensure proper 

condensate drainage.

2. Each condensate drain must be trapped separately using a J-Trap or

field supplied loop.

Figure 9. 

condensate Drainage Example