Field Installed Control Wiring; Ccad Package Chiller Interface - Trane CAUC-C20 Installation Operation & Maintenance

Field Installed Control Wiring

Before installing any connecting wiring, refer to Figure 3-2
for the electrical access locations provided on the unit. In-
stall appropriately sized control wiring for the 115 volt elec-
trical components as required by the application.
H A Z A R D O U S V O LTA G E !
DISCONNECT ALL ELECTRIC POWER INCLUDING
REMOTE DISCONNECTS BEFORE SERVICING.
Failure to disconnect power before servicing can
cause severe personal injury or death.
Since the unit-mounted 115V control power transformer
(1T1) is provided on all units, it is not necessary to run a
separate 115 volt control power source to the unit.
Note: 200/230 Volt units are shipped with
transformer 1T1 wired for 200 volt operation. If the
unit is to be operated on a 230 volt power supply,
rewire the transformer as shown on the unit
schematic.
When the 115 volt control circuit is properly connected to
the field provided interlock contacts 5K1 for circuit #1 and
5K2 for circuit #2 (if applicable), proper condenser fan cy-
cling and ambient control for the remaining fans is achieved
with corresponding compressor operation.
Note: All field wiring must conform to NEC
guidelines as well as state and local codes.

CCAD Package Chiller Interface

The Unit Control Module (UCM) within the Trane Model
CCAD package chiller is designed to control the CAUC con-
denser fan operation. To obtain proper condenser fan se-
quencing for the CCAD package chiller, several control wir-
ing modifications must be made to the CAUC units.
Refer to Figure 3-7 and the field wiring diagram in the
CCAD package chiller installation literature. Follow the ap-
propriate procedure below for the operating ambient appli-
cation when installing the 115 volt electrical wiring for the
CAUC unit.
Installation (Continued)
Standard Ambient Operation
(Circuit #1 - 20 through 60 Ton Units)
1. Remove the jumper wire from between terminals 1TB2-3
and 1TB2-4 in the CAUC unit control panel.
2. Install a jumper between terminals 1TB3-3 and 1TB3-4 in
the CAUC control panel.
3. Install interconnecting wiring between the following termi-
nals:
CAUC Unit
1TB2-1 to
1TB2-4 to
1TB2-5 to
(Circuit #2 - 40 through 60 Ton Units)
4. Remove the jumper wire from between terminals 1TB2-8
and 1TB2-9 in the CAUC unit control panel.
5. Install a jumper between terminals 1TB3-8 and 1TB3-9 in
the CAUC control panel.
6. Install interconnecting wiring between the following termi-
nals:
CAUC Unit
1TB2-1 to
1TB2-9 to
1TB2-10 to
Low Ambient Operation
(Circuit #1 - 20 through 60 Ton Units)
1. Complete steps 1 through 3 of the previous standard am-
bient procedure for Circuit # 1.
2. Install an additional jumper between terminals 1TB3-6
and 1TB3-7 in the CAUC control panel.
(Circuit #2 - 40 through 60 Ton Units)
3. Complete steps 4 through 6 of the previous standard am-
bient procedure for Circuit #2.
4. Install an additional jumper between terminals 1TB3-11
and 1TB3-12 in the CAUC control panel.
5. Follow the low ambient damper adjustment procedure
listed in the "Low Ambient Damper" section before start-
ing the unit.
23
CCAD Unit
TB1-3 of 1U1A7
TB1-2 of 1U1A7
TB1-1 of 1U1A7
CCAD Unit
TB1-3 of 1U1A8
TB1-2 of 1U1A8
TB1-1 of 1U1A8