Unitary Products Group
ACCESSORY KIT INSTALLATION INSTRUCTIONS
Low Ambient Accessory
For Air Cooled Split-System Air Conditioners
HA 300, HB 360 / 480 / 600, HF-25, HL-30 / -40 / -50 Models
035-20209-000-A-0904
GENERAL
These split-system condensing units are designed to
operate at ambient temperatures down to 40°F. This
accessory will insure safe operation at ambient temper-
atures down to 0°F. The VLT6000 control monitors the
refrigerant system and will vary the condenser fan
speed based on the discharge pressure. One controller
is required for each fan to be controlled. Therefore, two
accessory kits are required for each unit. This instruc-
tion provides all the necessary information to properly
field-install a low ambient accessory on the condensing
units listed in Table 1. Components that are supplied in
the respective accessory are listed in Table 2, and pic-
tured in Figure 1.
TABLE 1: APPLICATION DATA
ACCESSORY MODEL #
VOLTAGE
UNIT
2LA04702658
575
HA 300, HF -25
2LA04702858
575
HB 360, HL -30
2LA04702958
575
HB 480, HL -40
2LA04703058
575
HB 600, HL -50
TABLE 2: ACCESSORY COMPONENTS
ITEM
QTY.
PART NO.
DESCRIPTION
1*
1
*
ea
*.
“X” denotes Model number needed for application.
473-24615-00X*
VLT6000 Condenser Fan Speed
Control and Enclosure
2
1 ea
025-38680-000
Pressure Transducer
3
1 ea
025-38681-000
Wire Harness Assembly
4
1 ea
025-37466-000
Power wire Harness
5
1 ea
023-20566-000
Tee Connector
6
2 ea
021-15529-000
Screw HEX ¼-14 X.75
7
1 ea
025-10209-000
7/8 Bushing
8
2 ea
025-14284-000
1 3/8 Bushing
9
6 ea
025-09607-000
Wire Tie
10
1 ea
025-37455-000
0º Degree Switch
11
†
†. Crankcase Heaters supplied are dependent on accessory
ordered.
2 ea
025-37425-575
30/40 Ton Crankcase Heater
2 ea
025-37474-575
25/50 Ton Crankcase Heater
FIGURE 1 - ACCESSORY COMPONENTS
The 2LA047 series low ambient accessories are
intended for use with the 25-50 Ton Split System con-
densing units only. UPG cannot guarantee proper
operation for any application of this VLT6000 control-
ler for other equipment or applications. Contact your
local branch or distributor for any application related
questions.
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 this conversion.
If the unit is connected to power sources, make sure
that all electrical power to the unit has been discon-
nected.
