Trane RTAA-170 User Manual

102
RTAA-IOM-3
Menu 4 – Factory Display #1
40 - Leaving Water Temp. Cutout
Setpoint: Establishes a leaving chilled
water temperature, below which the
UCM will begin unloading
compressors and, if necessary,
terminate unit operation. See
discussion in “Leaving Water
Temperature Cutout”. See Table 15 for
proper settings.
41 - Low Refrigerant Temp. Cutout
Setpoint: Establishes a saturated
evaporator refrigerant temperature,
below which the UCM will begin
unloading compressors and, if
necessary, terminate unit operation.
See discussion in “Low Refrigerant
Temperature Cutout”. See Table 15 for
proper settings.
Table 15
Leaving Fluid Temperature Setpoints
Chilled Leaving Low
Water Water Temp Refrig Temp Recommended *** Solution Freeze
Setpoint - F Cut out - F Cut out - F % Ethylene Glycol Point - F
40 35 22 0 32
39 34 20 3
38 33 18 6
37 32 17 8
36 31 15 10 25
35 30 14 12
34 29 12 14
33 28 11 15 21
32 27 9 17
31 26 7 19
30 25 6 20 16
29 24 4 21
28 23 2 23
27 22 0 25 10
26 21 -1 26
25 20 -3 28
24 19 -5 29
23 18 -6 30 4
22 17 -8 31
21 16 -10 33
20 15 -11 34
19 14 -13 35 -3
18 13 -15 36
17 12 -17 37
16 11 -18 38
15 10 -19 39
14 9 -21 40 -11
13 8 -23 41
12 7 -24 42
11 6 -26 43
10 5 -27 43
9 4 -29 44
8 3 -31 45 -21
7 2 -32 46
6 1 -34 47
5 0 -35 47
4 - 1 -37 48
3 -2 -38 49
2 -3 -39 50 -32
1 -4 -39 50
0 -5 -39 50
***Recommended % Ethylene Glycol will give freeze protection consistent with other
chiller safety controls (solution freeze point is nominally 10 F above refrig temp cutout).

Trane RTAA-170 Specifications

General

Brand	Trane
Model	RTAA-170
Category	Chiller
Language	English