Johnson Controls Air Conditioner Low Ambient Pressure Kit User Manual

ACCESSORY KIT INSTALLATION MANUAL  
LOW AMBIENT PRESSURE KIT MODEL 2LA06700224 & 2LA06700424  
FOR MODELS: SPLIT SYSTEM AIR CONDITIONERS AND HEAT PUMPS  
GENERAL INFORMATION  
INSTALLATION  
The low ambient pressure switch kit (2LA06700224) for R-22  
models and 2LA06700424 for R-410A models) are designed to  
regulate condenser liquid pressure at low outdoor ambient tem-  
peratures by controlling the airflow over the condenser. The low  
ambient pressure kit will energize the outdoor motor when the  
liquid line pressure reaches 300 +/-10 PSIG for R-22 models  
and 360 +/-10 PSIG for R-410A models, it will stop the motor  
when the pressure falls below 150 +/- PSIG for R-22 models  
and 240 +/- PSIGfor R-410A models.  
Make sure the electric power is shut-off. Failure to dis-  
connect the electric power could result in electric  
shock and severe injury from the outdoor fan.  
1. Disconnect power to the unit.  
2. Remove the control access panel.  
3. Locate the liquid line base valve and remove the cap off the  
schrader valve.  
The supplied relay has a normally-closed contact. As the liquid  
pressure falls below the low setting of the pressure switch, the  
relay will energize and open the normally-closed contact, thus  
breaking the circuit of the fan motor, causing it to stop.As the  
liquid pressure increases above the high pressure setting of the  
pressure switch, the relay will de-energize and close the nor-  
mally-closed contact, re-energizing the fan. Heat pumps use  
the 4-way reversing valve power for the control circuit of the low  
ambient kit in the order to disable low ambient fan cycling in the  
heat mode.  
4. Attach the tee fitting and pressure switch to the liquid line  
base valve , as shown in Figure 1.  
When applying this kit, a TXV must be used on the indoor coil-  
and a crankcase heater should be added. This will guard  
against liquid migration and hard starts which could lead to pre-  
mature failure of the compressor.  
FLARE  
FITTING  
PRESSURE  
SWITCH  
VALVE  
CAP  
TEE FITTING  
ASSEMBLY  
PRE-INSTALLATION INFORMATION AND  
INSTRUCTIONS  
FLARE FITTING  
WITH DEPRESSOR  
BRASS REFRIGERANT  
VALVE (Liquid)  
Improper installation, adjustment service, or mainte-  
nance can cause injury or property damage; there-  
fore, only a qualified installer or qualified service  
personnel should perform the conversion.  
FIGURE 1: Pressure Switch Assembly  
5. Tighten all connections using a 9/16” wrench. Check the  
connections between the switch and schrader valve for  
leaks.  
1. With this kit, only use motors that are single phase, perma-  
nent split, capacitor type or shaded pole motors.  
6. Route the pressure switch wires through the grommet  
located on the bottom of the control box. Secure the wires  
away from hot refrigerant lines with a wire tie.  
2. Line Voltage Range: 120 to 600 Volts AC.  
3. Wiring must comply with all local and national electric  
codes.  
7. Secure the relay with #10 screws included in the kit. Use  
the relay to mark and drill two (9/64 inch) holes so that the  
relay is 1/2 inch away from high voltage wiring and compo-  
nents.  
4. Crankcase heater should be applied in conjunction with  
this kit.  
INSPECTION  
The following list details the parts included in this kit. Inspect  
the kit to ensure that all the parts are included.  
8. To wire the low ambient pressure kit:  
a. For 1 and 3 phase AC, use Figure 2.  
b. For 1 and 3 phase HP, use Figure 3*.  
TABLE 1: Source 1  
*To connect wires to “O” and “C” in the low voltage box, cut off  
wire connections from the additional black wires provided in kit  
and strip insulation from wire. Use existing wire nuts to connect  
into “O” and “C” junction.  
ITEM QTY.  
PART NO.  
513033  
473-19101-000  
DESCRIPTION  
Pressure Switch  
Relay  
1
2
3
4
5
6
7
8
1
1
2
1
2
2
1
1
Black Wire  
9. Replace the control access panel and restore power to the  
unit.  
Black Wire  
021-17310-000  
Screw #10-16x3/8  
Wire Tie  
10. With the unit running in the cooling mode, make sure the  
outdoor fan operates properly and replace all schrader  
valve caps.  
6666  
Tee Fitting  
1216-175  
Line Splice Connection  
Johnson Controls Unitary Products  
513433-UAI-A-0509  
 
513433-UAI-A-0509  
FIGURE 3: Wiring Connections for Heat Pump Units  
Johnson Controls Unitary Products  
3
 
Subject to change without notice. Published in U.S.A.  
513433-UAI-A-0509  
Copyright © 2009 by Johnson Controls, Inc. All rights reserved.  
Supersedes: 67357/035-19987-001-A-0204 & 18648-UAI-D-0209  
Johnson Controls Unitary Products  
5005 York Drive  
Norman, OK 73069  
 

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