Nordyne B5SM -090 Filter Requirements, Pressure Drop Across Filters, Electrical Rating Data

•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 filters 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.

6.Re-install the filter slide assembly back into the filter 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.

Model	Nominal		Filter
				Resistance
B5SM	CFM	Size
				(W.C.)
	2200			0.03
	2600			0.04
090	3000	18 x 24 (1”)		0.05
	3400			0.07
	3800			0.08
	4200			0.09
	3000			0.05
	3400			0.07
120	3800	18 x 24 (1”)		0.08
	4200			0.09
	4600			0.11
	5000			0.13

Table 1. Pressure Drop Across Filters

FILTER BRACKET
LOCATION
BRACKET CONFIGURATION	BRACKET CONFIGURATION FOR
FOR 1” FILTER APPLICATIONS	2” FILTER APPLICATIONS
(FACTORY SETTING)
FILTERS
“Z” BRACKET
	“L” BRACKET
REMOVE 4 SCREWS FROM
FILTER RACK FRAME
REMOVE 4 SCREWS SECURING
“Z” BRACKET AND “L” BRACKET

Figure 1. Converting from 1” Filter to 2” Filter Applications

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 2. Electrical Rating Data

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