Replacement Procedure
10 PART-SVN251A-EN
7. Install the 24 Vac transformer.
• Install
the 120/24 Vac transformer in the bottom part of the control panel to the left of 1TB3.
Install the transformer so the primary connections face 1TB3.
8. Install additional wiring.
a. Connect the 24 Vac transformer primary (120 Vac side) wires to 1TB3-1 and 1TB3-2.
b. Connect the 24 Vac transformer secondary to CLD terminals J2-1 and J2-2.
c. Connect the IPC communications wires.
Note: IPC
communications is a daisy-chain communications system that is connected to
the J1 connectors on all of the modules in the RTAA control system except for the
CLD.
i. Inspect all of the J1 connectors on the upper left-hand side of each silver control module
and
find two open terminals on the IPC communications bus.
ii. When you find two open terminals, remove the white cover from the back of the orange
plug
and use a small screwdriver to push 18 AWG wires into the knives on the connector
until
they cut through the wire insulation and hold the conductors securely.
iii. Re-install the white plug cover.
Note: If
there are no open J1 terminals, you can splice into the IPC communications link
using butt splices or wire nuts. Connect the other end of the IPC communications
wires to J1-1 and J1-2 on the new CLD module.
9. Remove lockout lock and restore power to the chiller.
10. Configure the chiller.
a. Use the settings recorded in Step 2, p. 4 to configure the new CLD. Refer to p. 72 of
RTAA-SVX01A-EN
(Installation, Operation, and Maintenance: Series R
®
Air-Cooled Rotary
Liquid Chillers) to help you enter settings into the new CLD.
b. Variable
Speed Fans should be set to DISABLE for both circuits.
Re-start the chiller by pressing the green Auto button
on the keypad.
Starts and Hours
Note: The compressor starts and hours recorded in Step 2, p. 4 cannot be transferred into the new
control system. Therefore, it is recommended that you record these numbers for all
compressors. All counters will start from zero in the new CLD control system.
Chilled Water Pump Control
The new control system you’re installing has an added feature. It has a normally open contact
output that can be used to control the evaporator water pump. Refer to Table 7, p. 9 for the
connection
points on the new 1U1 module. Chilled Water Pump can be set to ON or AUTO in the
Operator Settings menu. If this setting is ON, the pump output will remain energized any time
the control system is powered. If set to AUTO, the pump output will be energized whenever the
chiller is put into the Auto mode and will de-energize from 1 to 30 minutes (the default is
10 minutes) after the chiller leaves the Auto mode. The 1- to 30-minute timer can be configured in
the Chilled
Water Pump Off Delay setting.
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