General - Trane RTWB Helical-Rotary Installation Operation & Maintenance

General

This section describes the
mechanical operating principles of
the RTWB chillers equipped with
microprocessor-based control
systems.
The model RTWB chillers are dual-
compressor, helical-rotary-type,
water-cooled liquid chillers. The
basic components of a RTWB unit
are:
- Clear Language Display and
control modules
- Helical-rotary compressor
- Direct-expansion evaporator
- Water-cooled condenser
- Oil supply system
- Interconnecting piping
Components of a typical RTWB unit
are identified in Figure 2 and 3.
28
Operating Principles –
Mechanical
Figure 14 – RTWB refrigeration system and control components
1 Compressor
2 Condenser
3 Evaporator
4 Oil separator
5 Electronic expansion valve
6 Oil cooler (option)
7 Low-pressure switch
8 High-pressure switch
9 Solenoid valve
10 Refrigerant charging valve
11 Oil-separator draining valve
12 Oil-cooler expansion valve
13 Compressor discharge valve (option)
14 Liquid-line service valve
15 Oil-circuit service and charging valve
16 Filter
17 Chilled-water outlet connection
18 Chilled-water inlet connection
19 High-pressure safety valve (supply if required by code vessel approval)
20 Low-pressure safety valve
21 Low-pressure gauges (option)
22 High-pressure gauges (option)
23 Saturated refrigerant temperature sensor (condenser)
24 Saturated Refrigerant temperature sensor (evaporator)
25 Refrigerant temperature sensor (suction)
26 Oil temperature sensor
27 Leaving chilled-water temperature sensor
28 Entering chilled-water temperature sensor (option)
RTWB-SVN01B-E4