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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