Installation and Maintenance Manual

RTWD/RTUD Operating Principles
128 RLC-SVX09H-EN
Figure 49. RTWD/RTUD refrigerant chart
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
31
21
22
23
24
25
26
27
28
29
30
33
32
34
20
36
35
1 Compressor - Circuit 1 13 Refrigerant Filter - Circuit 2 25
Evaporator Leaving Water Temperature
Sensor
2 High Pressure Cutout Switch 14
Condenser Entering Water Temperature
Sensor (R
TWD only)
26 Evaporator Water Flow Switch
3
Compressor Discharge Temperature
Sensor
15
Condenser Leaving Water Temperature
Sensor (R
TWD only)
27 Gas Pump Drain Solenoid Valve
4
Condenser Refrigerant Pressure
T
ransducer
16
Condenser Water Flow Switch (RTWD
only)
28 Gas Pump Fill Solenoid Valves
5 Load/Unload and Step Solenoids 17 Evaporator - Circuit 2 29 Suction Pressure Transducer
6 Oil Separator - Circuit 1 18 Evaporator - Circuit 1 30 Oil Pressure Transducer
7 Oil Heater 19 EXV - Circuit 2 31 Suction Service Valve
8 Optical Oil Loss Level Sensor 20 EXV - Circuit 1 32 Check Valve
9 Oil Cooler (optional on RTWD) 21 Liquid Level Sensor - Circuit 2 33 Filter
10 Condenser - Circuit 1 (RTWD only) 22 Liquid Level Sensor - Circuit 1 34 Condenser Service Valve
11 Condenser - Circuit 2 (RTWD only) 23 Gas Pump - Circuit 1 35
Liquid Line Isolation Valve - Circuit 1
(R
TWD only)
(a)
12 Refrigerant Filter - Circuit 1 24
Evaporator Entering Water Temperature
Sensor
36
Liquid Line Isolation Valve - Circuit 2
(R
TWD only)(a)
(a) RTUD units do NOT ship with a factory installed liquid line isolation valve. A liquid line isolation valve must be field installed.