Ingersoll-Rand ReliaTel, Manual, Page: 156 / 176

156 RT-SVD03L-EN
Phase Monitor
ReliaTel ™ ™ 3 to 25 Tons
Phase monitors are installed on all 3 to 25 ton products
with three-phase power. The main purpose of the
phase monitor is to ensure that the scroll compressors
are rotating in the proper direction. A green LED on the
phase monitor indicates proper phasing.
If the input leads are crossed, the phase monitor will
sense this and will immediately shut the unit down.
The monitor will illuminate a red LED indicating a
phase reversal condition.
If the control wires are crossed on the Y and Y-out
terminals on the phase monitor, this will also cause the
red LED to illuminate and will not allow the unit to run.
If a red LED is displayed, swap two leads on the
incoming power to the unit. If the red LED is still
illuminated, check for proper control wiring
connections to the phase monitor. If all wiring is
correct, the phase monitor is defective and needs to be
replaced.
Figure 99. Phase monitor wiring diagram
Notes:
1. Dashed wiring & devices
provided by others.
2. Move existing wire W38
from LTB-6 to PHM-Y-OUT.
Power supply by customer
W38 (RED)
136A (RED)
36BX (BLU)
Low volt. connections
High volt. connections HTB1
PHM
Phase monitor (PHM)
option diagram
Secondary
common
ESTOP
3P (BLK)
2P (BLU)
1P (RED)
Y-Out Y C
L1 L2 L3
Cut wire
for 50Hz
ODF1 LTB