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34
Other, indirect means of estimating building load and con-
trolling temperatures reset are also available and are discussed
below. See Fig. 20.
To use Outdoor Air Temperature Reset, four variables must
be configured. They are: Cooling Reset Type (
Configuration
RSET
CRST
), OAT No Reset Temp (
Setpoints
COOL
CRO1
), OAT Full Reset Temp (
Setpoints
COOL
CRO2
) and Degrees Cool Reset (
Setpoints
COOL
DGRC
). In the following example, the outdoor air
temperature reset example provides 0° F (0° C) chilled water
set point reset at 85.0 F (29.4 C) outdoor-air temperature and
15.0° F (8.3° C) reset at 55.0 F (12.8 C) outdoor-air tempera-
ture. See Fig. 21 and Table 28.
M
a
xim
u
m Temper
a
t
u
re
0
0 (-12.2)
1
0 (-6.7)
2
0 (-1.1)
3
0 (4.4)
4
50 (10.0)
0 (15.6)
6
0 (21.1)
7
0 (26.7)
8
0 (
3
2.2)
9
0
2
5
1
0
1
5
0
mA
S
IGNAL
S
ET POINT IN DEG F (de
g
C)
n
o
i
t
a
u
q
E
e
n
i
r
B
e
r
u
a
t
r
e
p
m
e
T
m
u
i
d
e
M
r
e
t
a
W
h
s
e
r
F
MAXIMUM
S
ET POINT
MINIMUM
S
ET POINT (FLUD=1)
MINIMUM
S
ET POINT (FLUD=2)
Fig. 18 — 4 to 20 mA Set Point Control
0
1
2
3
4
5
6
0
1
8
6
4
2
0
COOLER FLUID TEMPERATURE DIFFERENCE (de
g
F)
DEGREE
S
RE
S
ET (de
g
F)
(EXAMPLE)
Fig. 19 — Water Temperature Difference Reset
Summary of Contents for AQUASNAP 30RBA315
Page 77: ...77 Fig 37 Control Schematic 30RB060 080 a30 4619...
Page 78: ...78 Fig 38 Control Schematic 30RB090 150 a30 4620...
Page 79: ...79 Fig 39 Control Schematic 30RB160 190 a30 4622...
Page 80: ...80 Fig 40 Control Schematic 30RB210 300 a30 4622...
Page 81: ...81 Fig 41 Heat Reclaim Control Schematic a30 4622...