RTWB-SVN01B-E4
20
Installation Electrical
Control power transformer
The RTWB units are equipped with a control power transformer as standard. It is not necessary to provide control
power voltage to these units.
Figure 12 - Electrical panel layout
1 Line
voltage
entrance
2 Power
section
3 Control
section
4 Free space for customer pump control
5 Wye-delta, closed-transition starter circuit A
6 Wye-delta, closed-transition starter circuit B
7 Unit disconnect, non-fused
8 CKT # 1 Lockout (module A20-1 6X7-8)
9 CKT # 2 Lockout (module A20-2 6X9-10)
10 Emergency stop (Normal/Stop contact - module A1 TB1 3-4)
11 Zone temperature sensor (6R3) or ice-machine control (6S55) option (6R3 and 6S55 cannot be used together) (module A9 TB1 1-2)
12 External chilled-water setpoint 4-20 mA or 2-10 V (dc)with communication interface option (module A9 TB1 4-5 7-8)
13 Communication serial link (A9 TB2 1…4)
14 Leaving condenser-water temperature sensor (5R53-2) option (with option PCM A70)
15 Chilled-water flow switch (6S56 - MODULE A1 TB3-4)
16 External Auto/Stop (6S1 - module A1 TB3 3-4)
17 Customer
output:
Remote alarm indicator (from normally-closed signal)
Maximum capacity indicator
Compressor running indicator
Remote alarm indicator (from normally-open signal)
18 Chilled-water pump starter (TRANE UCM pump control - module A1 TB4 8-9)
19 Chilled-water pump starter (Auxiliary Interlock - MODULE A1 TB3 1-2
20 Tracer (Option - module A9 TB2 1…4)
