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• The B5SM-120 air handler has a dual circuit coil and
the B5SM-090 has a single circuit coil.
• The B5SM-120 air handler is charged through service
valves on the end of the liquid tube for each circuit.
These must be removed before brazing the line sets.
The B5SM-090 is charged through a service valve
inside the unit, which should not be removed.
• Before brazing the B5SM-090, remove the core from
the service port. Failure to do this may result in a leak
at the service valve. Replace the core and cap once
brazing is complete.
• Optional equipment such as liquid line solenoid valves,
low ambient, etc., should be installed in strict accordance
with the manufacturer’s installation instructions.
Filter Requirements
B5SM air handlers are shipped with three permanent
1” fi lters; however the fi lter rack can be converted to
accommodate a 2” fi lter. To convert to a 2” fi lter:
1. Remove all fi lters from the unit.
2. Locate and remove the 4 screws (Figure 1) holding
the bottom fi lter slide assembly (latch end) to the fi lter
rack frame. NOTE: Be careful when removing the slide
assembly so it does not drop into unit and cause damage
to the coil.
3. Remove the 4 screws securing the “L” bracket to the
“Z” bracket.
4. Rotate the “L” bracket 180 degrees, and reposition it so
it mounts fl ush with the “Z” bracket. See Figure 1.
5. Secure the fi lter slide assembly together with the four
screws.
Table 2. Electrical Rating Data
MODEL VOLTAGE PHASE Hz FLA HP MCA MOP
-090 & -120 J 208-230/460 3 60 6.6-6.6/3.3 2 8.3-8.3/4.2 15
-090 & -120 K 208-230 1 60 11.3-10.0 2 14.2-12.5 25-20
FLA = Full Load Amps, MCA = Minimum Circuit Ampacity, MOP = Maximum Over-Current Protection
Table 1. Pressure Drop Across Filters
Model
B5SM
Nominal
CFM
Filter
Size
Resistance
(W.C.)
090
2200
18 x 24 (1”)
0.03
2600 0.04
3000 0.05
3400 0.07
3800 0.08
4200 0.09
120
3000
18 x 24 (1”)
0.05
3400 0.07
3800 0.08
4200 0.09
4600 0.11
5000 0.13
6. Re-install the fi lter slide assembly back into the fi lter rack
frame and secure with the 4 screws removed earlier. If
replacing factory supplied fi lters with disposable fi lters,
use only 2” disposable fi lters.
Accessing the fi lters does not require tools and can be
performed from either side of the fi lter-rack. On the service
side of the unit, locate the release knob at the base of
the fi lter rack and rotate clockwise to unlock, then pull up
and out to remove the fi lter access panel. On the blower
side, use the same method but rotate counter-clockwise
to unlock.
Figure 1. Converting from 1” Filter to 2” Filter Applications
BRACKET CONFIGURATION FOR
2” FILTER APPLICATIONS
BRACKET CONFIGURATION
FOR 1” FILTER APPLICATIONS
(FACTORY SETTING)
“Z” BRACKET
“L” BRACKET
REMOVE 4 SCREWS FROM
FILTER RACK FRAME
FILTERS
FILTER BRACKET
LOCATION
REMOVE 4 SCREWS SECURING
“Z” BRACKET AND “L” BRACKET