Unitary products group HA 300, HB 360, HB 600, HF-25, HB 480 Installation Instructions Manual

035-20209-000-A-0904

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

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 temper­atures 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 ins truc­tion provides all the necessary information to properly
field-install a low ambient accessor y on the con den sing
units listed in Table 1. Components that are supplied in
the respective accessory are listed in Table 2, and pic­tured 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

FIGURE 1 - ACCESSORY COMPONENTS

TABLE 2: ACCESSORY COMPONENTS

ITEM QTY. PART NO. DESCRIPTION

*

1*

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

*. “X” denotes Model number needed for application.
†. Crankcase Heaters supplied are dependent on accessory

ordered.

473-24615-00X*

ea

1

2 ea 025-37425-575 30/40 Ton Crankcase Heater
2 ea 025-37474-575 25/50 Ton Crankcase Heater

VLT6000 Condenser Fan Speed

Control and Enclosure

The 2LA047 series low ambient accessories are
intended for use with the 25-50 T on Split System con­densing units only. UPG cannot guarantee proper
operation for any application of this VLT6000 control­ler for other equipment or applications. Contact your
local branch or distributor for any application related
questions.

Improper installation, adjustment, service or mainte­nance can cause injury or property damage. Th ere­fore, 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 discon­nected.

Unitary Products Group

035-20209-000-A-0904

RED WIRE = 10.0 VDC SUPPLY
BLACK WIRE = COMMON

WHITE WIRE = OUTPUT

1. Disconnect all electrical power to the unit.

2. Remove the condensing unit control box access
panel.

Before installing accessory read all of this installation
instruction.

3. Install the VLT6000 enclosure with the provided
screws. Mounting holes are pr e- pu n c h ed in th e top
rails to locate the enclosure near the condensing
unit control box. See Figure 7.

INSERT WIRING

HARNESS PLUG

¼ In. SAE FEMALE FITTING

WITH SCHRADER VALVE DEPRESSOR

• Perform a leak test on fittings and connections
before putting the system into operation .

MOUNT

TRANSDUCER

VERTICALLY

TEE

TO DISCHARGE

LINE PORT

MOUNT

TRANSDUCER

VERTICALLY

TO

DISCHARGE

LINE

PORT

FIGURE 3 - PRESSURE TRANSDUCER MOUNTING

FIGURE 2 - PRESSURE TRANSDUCER

Do not remove the plastic plugs from the transducers
until they are ready to be installed.

4. Attach the pressure transducers to the connection
tee (provided in accessory). The pressure trans­ducer has a ¼ In. SAE female flare with Schrader
valve depressor for mounting to the tee.
See Figure 2.

• Hand thread the transducer to the tee.

• Tighten and secure the connection.

• Remove the Schrader valve cap from the dis­charge line port (provided).

• Hand thread the tee to the discharge line port.

• Tighten and secure the connection, making sure
the transducer is mounted vertically. See Figure

3.

NOTE: This procedure must be repeated for each sys-

tem.

5. Attach wiring harness assembly plug to transducer.
See Figure 4. Route sensor wires back to VLT6000
enclosure.

FIGURE 4 - WIRE HARNESS ASSEMBLY

6. Remove VLT6000 enclosure lid.

7. Pass wires through the bushing (provided), using
knock out located in the bottom of the VLT6000
enclosure.

8. Access the VLT6000 control terminal blocks. See
Figure 6.

9. Remove the terminal access cover. See Figure 5.

2 Unitary Products Group

035-20209-000-A-0904

FAN MOTOR # 4

VLT6000 ENCLOSURE

FAN MOTOR # 3

FIGURE 5 - VFD66 CONTROL TERMINAL BLOCKS

10. Wire transducers to the VLT6000 control.
See Figure 6.

OUTPUT

POWER

(MOTOR)

TERMINAL

BLOCK

CONTROL

TERMINAL

BLOCK

INPUT
POWER
(MAINS)

TERMINAL

BLOCK

FIGURE 6 - P399 PRESSURE TRANSDUCER

WIRING

• Route power wires, motor leads, and transducer
signal wires through separate knockouts. See
Figure 6.

• Connect White Wire from T ransducer to Terminal
(53) on the VLT6000.

• Connect Black Wire from Transducer to Terminal
(55).

• Connect Red Wire from Transducer to Terminal
(50).

• Connect Bare (shield) Wire from Transducer to
Grounding Terminal.

FAN MOTOR # 2

FAN MOTOR # 1

VLT6000 ENCLOSURE

FIGURE 7 - FAN MOTOR #1 LOCATION

NOTE: All Wiring must comply with prevailing Local

and National wiring codes and ordinances.

11. Cut two lengths of flexible conduit (Field Supplied)
to connect from the VLT6000 Control to the con­densing unit control box.

• Conduit #1 should run from the bottom of the
VLT6000 enclosure to the condensing unit con­trol box, using knock outs provided.

• In conduit #1 insert three # 14 Gage wires
marked on both ends (field supplied).

• Conduit #2 should run from the bottom of the
VLT6000 enclosure to the condensing unit con­trol box, using knock outs provided.

• In conduit #2 insert shielded power cable sup­plied in accessory.

• Allow additional conduit length to remove the
VL T Control enclosure from the top rail and place
on side for servicing.

12. Wire condenser fan motor #1 to the VLT6000 con­trol. See Figure 6, and the SWD in Figure 9. The
VLT6000 must be wired to operate fan motor #1.
Factory installed pressure switches control fan
motor #2.

• Disconnect wire 136/BLK from terminal (T1) on
contactor (M5).

• Disconnect wire 137/BRN from terminal (T2) on
contactor (M5).

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