Low Ambient Kit with..

Low Ambient Kit with..
102694-UAI-B-0107
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 VFD66 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,
one accessory kit would be required to control each
refrigerant circuit. Two kits are required if both refrigerant circuits are to be operated below 40°F. This instruction 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 pictured in Figure 1.
FIGURE 1 - ACCESSORY COMPONENTS
TABLE 1: APPLICATION DATA
ACCESSORY MODEL #
VOLTAGE
UNIT
2LA04702625
208/230
HA 300
2LA04702646
460
HA 300
2LA04702825
208/230
HB 360
2LA04702846
460
HB 360
2LA04702925
208/230
HB 480
2LA04702946
460
HB 480
2LA04703025
208/230
HB 600
2LA04703046
460
HB 600
The 2LA047 series low ambient accessories are
intended for use with the 25-50 Ton Split System condensing units only. UPG cannot guarantee proper
operation for any application of this VFD 66X controller for other equipment or applications. Contact your
local branch or distributor for any application related
questions.
TABLE 2: ACCESSORY COMPONENTS
ITEM
QTY.
PART NO.
DESCRIPTION
11
1 ea
473-24615-00X
VFD66X Condenser Fan Speed
Control and Enclosure
2
1 ea
025-37463-000
Pressure Transducer
P399BAC-1CY
3
1 ea
025-37464-000
Wire Harness Assembly
WHA-P399-500C
4
1 ea
025-38411-000
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
025-09848-000
Bushing
8
6 ea
025-09607-000
Wire Tie
9
1 ea
025-37455-000
0º Degree Switch
025-37423-240
30/40 Ton Crankcase Heater
025-37424-460
30/40 Ton Crankcase Heater
025-37474-240
25/50 Ton Crankcase Heater
025-37474-460
25/50 Ton Crankcase Heater
025-XXXXX-XXX
Fuses
102
113
Improper installation, adjustment, service or maintenance can cause injury or property damage. Therefore, 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.
2 ea
3 ea
1. “X” denotes Model number needed for application.
2. Crankcase Heaters supplied are dependent on accessory
ordered.
3. Fuses supplied are dependant on accessory ordered.
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1. Disconnect all electrical power to the unit.
2. Remove the condensing unit control box access
panel.
102694-UAI-B-0107
Before installing accessory read all of this installation
instruction.
3. Install the VFD66 enclosure with the provided
screws. Mounting holes are pre-punched in the
top rails to locate the enclosure near the condensing unit control box. See Figure 7.
FIGURE 3 - P399 PRESSURE TRANSDUCER
MOUNTING
NOTE: Note: This procedure must be repeated for
each system.
FIGURE 2 - P399 PRESSURE TRANSDUCER
5. Attach wiring harness assembly plug to (P399)
transducer. See Figure 4. Route sensor wires
back to VFD66 enclosure.
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.
•
•
•
•
•
•
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.
Perform a leak test on fittings and connections
before putting the system into operation.
FIGURE 4 - WIRE HARNESS ASSEMBLY
6. Remove VFD66 enclosure lid.
7. Pass wires through the bushing (provided), using
knock out located in the bottom of the VFD66
enclosure.
8. Access the VFD66 control terminal blocks. See
Figure 5.
•
•
Remove the terminal access cover screws.
Push downward on the ventilation holes while
pulling outward on the top of the terminal access
cover.
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102694-UAI-B-0107
FIGURE 5 - VFD66 CONTROL TERMINAL BLOCKS
9. Wire transducers to the VFD66 control.
See Figure 6.
FIGURE 7 - FAN MOTOR #1 LOCATION
NOTE:
FIGURE 6 - P399 PRESSURE TRANSDUCER
WIRING
•
•
•
•
•
Cut hole in the left most bushing in the bottom of
the VFD66 control. See Figure 6. Push transducer sensor wires through this bushing.
Connect red wire from transducer to terminal (1)
on terminal block (TB3) located on the VFD66
Control.
Connect black wire from transducer to terminal
(4) on terminal block (TB3).
Connect white wire from transducer to terminal
(2) on terminal block (TB3).
Connect bare wire from transducer to the
grounding terminal on VFD66 control.
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All Wiring must comply with prevailing
Local and National wiring codes and
ordinances.
10. Cut two lengths of flexible conduit (Field Supplied)
to connect from the VFD66 Control to the condensing unit control box.
•
•
•
•
•
Conduit #1 should run from the bottom of the
VFD66 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
VFD66 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
VFD Control enclosure from the top rail and
place on side for servicing.
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102694-UAI-B-0107
needed in the future. To install a jumper, position
the jumper on both pins. See Figure 9.
11. Wire condenser fan motor #1 to the VFD66 control.
See Figures 5, 7, and the wiring diagrams in Figures 10,11 and 12. The VFD66 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).
Disconnect wire 138/PR from terminal (T3) on
contactor (M5).
Extend wire 136/BLK to terminal (T1) on terminal
block (TB2) located on the VFD66 control using
wires in conduit #1.
Extend wire 137/BRN to terminal (T2) on terminal block (TB2).
Extend wire 138/PR to terminal (T3) on terminal
block (TB2).
Connect (BLK) wire of power harness to terminal
(T1) on contactor (M5) and to terminal (L1) on
terminal block (TB1) located on the VFD66 control using shielded cable in conduit #2.
Connect (RED) wire of power harness to terminal (T2) on contactor (M5) and to terminal (L2) on
terminal block (TB1).
Connect (WHT) wire of power harness to terminal (T3) on contactor (M5) and to terminal (L3) on
terminal block (TB1).
Connect bare wire of power harness to the
grounding terminal on VFD66 control.
FIGURE 9 - JUMPER PLACEMENT ON PINS
•
•
Jumper block (J9) selects maximum frequency
output of the control. Remove the jumper for 50
Hz motors. Install the jumper for 60 Hz motors.
Power must be removed and reapplied before
frequency changes will have effect.
Jumper block (J8) establishes single or dual
input signal operation.
NOTE: The VFD66 is factory configured to accept
single input operation.
Therefore, (J8) jumper should be installed on
both pins for this application.
•
•
Jumper blocks (J2), (J3), (J4), (J5), (J6), and (J7)
are preset at the factory and cannot be field
adjusted.
The activation pressures are preset at the factory.
12. Check positioning of two jumpers to assure proper
operation of VFD66 control. See Figure 8.
13. Remove existing low ambient switch (LAS)(See
Fig. 10), located in the unit control box, and replace
with new 0o ambient switch (provided).
14. Remove existing fuses of the condenser fan motor
to which the VFD66 control is being applied.
Replace with new fuses (provided).
15. Install additional crankcase heaters on the compressors of the system to which the VFD66 control
is to be applied. Wire each additional heater parallel to the existing heater, utilizing the existing
ground.
FIGURE 8 - JUMPER BLOCK LOCATIONS
•
To remove a jumper, reposition the jumper so
that it is connected to only one pin on the jumper
block. Keep the jumper because it may be
16. Secure wiring in the unit control box in a neat workman like manner using wire ties.
17. Replace terminal access cover on VFD66 control.
18. Replace lid on VFD66 enclosure.
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102694-UAI-B-0107
As the discharge pressure begins to fall below the
270 PSI. setpoint, the drive will reduce the speed of
the condenser fan.
As the ambient temperature drops below 400F the
condenser fan will slow to the minimum speed.
The pressure controlled condenser fan will disengage when the discharge pressure drops below
180 PSIG as the ambient temperature falls. The
system discharge pressure will increase when the
condenser fan is disengaged causing the VFD66
control to increase the condenser fan speed.
19. Close unit control box by replacing unit access
panel and restore power to the unit.
20. Verify proper unit operation.
A call for cooling closes the (M5) contactor powering the VFD66 control. As the discharge pressure
rises above 210 PSI. during startup, the VFD66
control will increase the speed of the condenser
fan accordingly.
The unit’s scroll compressor produces a rapid rise
in discharge pressure upon startup and this,
depending on the ambient temperature, will result
in full speed operation of the condenser fan. After
the discharge pressure has stabilized, the speed of
the condenser fan may decrease especially during
times when the ambient temperature is below 800F.
If the discharge pressure has stabilized and an
additional compressor is energized, the speed of
the condenser fan may increase, compensating for
the rise in discharge pressure.
21. Contact your local branch or distributor for questions regarding installation.
FIGURE 10 - LAS-LOW AMBIENT SWITCH WIRING LOCATIONS
* Single control board (RB1) applies to 25-Ton unit only.
**Dual control board (RB1 & 2) apply to 30, 40 & 50 ton units.
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102694-UAI-B-0107
FIGURE 11 - 25, 30, 40 & 50 TON LOW AMBIENT KIT DIAGRAM
6
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102694-UAI-B-0107
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7
Subject to change without notice. Printed in U.S.A.
Copyright © 2007 by Unitary Products Group. All rights reserved.
Unitary
Products
Group
102694-UAI-B-0107
Supersedes: 102694-UAI-A-1004
5005
York
Drive
Norman
OK
73069
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