Electrical data – Carrier 30HR User Manual
Page 15
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
ELECTRICAL DATA
CAPACITY CONTROL STEPS
CONTROL SEQUENCE
#
TRANS SW POS 1*
TRANS SW POS 2*
UNIT
30HR
30HS
CONTR
STEPS
%
Cap.
Ope
Tot.
r C
Ck
Co
1
у Mr
1
mpt
£
ider
Ckt
ess
3t
s
2
or
4
%
Cap.
Ope
Tot.
r C
Ck
Co
Ì
yl i
f 1
2
nde
Ck
res
3t
rs
♦
2
sor
4
1
25 0
2 2
_
—
25 o’
2
_
2
040
2
50.0
4
2
_
2
_
50.0
4
2
2
_
3
75.0
6
4
_
2
75.0
6 2
4
_
4
100.0 8
4
-
4
-
100.0 8
4
-
4
1
40 Ò
4
4
—
— —
20
0
2
— —
2
050
2
60 C
6
4
—
2
60 0
6
4
_
2
_
3
80.0
8 6
_
2
_
80 0
8
4
_
4
_
4
100.0 10 6
-
4
-
100.0 10 6
4
-
- „ .
1
33.0
4
4
„
33 0
4
_
_
4
_
060
2
67.0
8
4
—
4
—
67 0
8
4
_
4
—
3
83.0
10 6
_
4
—
83 0
10
4
_
6
_
4
100.0 12 6
-
6
~
100.0 12 6
-
6
„
1
27.5
4
_
4
_
14 3
2 2
_
_
_
2
43 0
6
— _
6
_
27 5
4
4
_
_
_
3
57.0
8
4
4
_
43 C
6 2
4
_
070
4
71 4
10
_
4
6
_
57 0
8
4 4
_
_
5
71 4
10 2
4
4
_
71 4
10 2
4
4
_
6
85.7
12
4 4
4
_
85.7
12 2
4
6
_
7
100.0
14
4 4
6
-
100.0
14
4 4
6
-
1
25.0
4
_
_
4
_
25.0
4
4
_
_
_
2
37.5
6
_
_
6
_
37.5
6 6
_
—
3
50.Q
8
_
4
4
—
50 0
8
4 4
_
_
080
4
62.5
10
_
4
6
_
62 5
10 6
4
_
_
5
75 0
12
4 4
4
_
75 0
12
4 4
4
—
6
87 5
14
6
4
4
_
87 5
14
4 4
6
—
7
100 C 16
6
4
6
-
100
0 16
6
4
Ó
-
1
22.2
4
_
4
22
2
4
4
_
_
_
2
33 3
6
—
6
33 3
6 6
_
— _
3
55 5
10
_
6
4
_
55.5
10
4
6
_
090
4
66.7
12
6
6
_
66.7
12 6 6
— _
5
77.8
14
4
6
4
—
77 8
14
4
6
4
_
6
88.9
16
6 6
4
88
9 16
4
6 6
_
7
100
0 18
6 6 6
-
100.0
18
6 6 6
_
1
20.0
4"
4
_
20.0
4
_
_
4
_
2
30 0
6 6
_
_
—
30.0
6
6
_
3
40 0
8
4
_
_
4
40.0
8
4
4
- -
100
4
50 0
10 6
_
—
4
50 0
10
_
4
6
—
5
70.0
14
6
_
4 4
70.0
14
4 4
6
6
80.0
16
6
_
6
4
80 0
16
6
4
6
—
7
90 0
18
6
4
4 4
90 0
18
4
4
6
4
8
lOO.C
20
6
4
6
4
100.0 20 6
4
6
4
1
18 2
4
4
—
_
—
18.2
4
— —
4
—
2
27 3
6 6
„
—
27 3
6
— —
6
—
3
36.3
8
4
—
—
4
45 5
10
6
4
—
no
4
45 5
10 6
_
—
4
54 6
12
6
6
_
5
63.7
14
6
_
4
4
72 8
16
4
6
6
6
72.8
16
6
_ _
6
4
81 9
18
6 6 6
_
7
91 0
20 6 6
4 4
91.0
20
4
6
6
4
8
100.0 22 6 6 6
4
100
0
22
6
6 6
4
1
16 7
4
4
_
_
_
16 7
4
_
4
_
2
25.0
6 6
_
_
_
25 0
6
—
_
6
—
3
41.7
10
4
_
6
41.7
10
_
6
4
—
120
4
50 0
12 6
- ,
—
6
50.0
12
—
6
6
—
5
66
7 16
6
—
4
6
66.7
16
4
6 6
—
6
75 0
18
6
_
6 6
75.0
18
6
6 6
—
7
91.7
22 6 6
4
6
91 7
22
4
Ó
6 6
i 8
- —
100.0
24
6 6
6
100.0
24
6 6
Ó 6
1
29 G
6
6
—
— —
29 0
6
—
^ —
6
—
140
2
57.0
12
6
_
6
—
57 0
12
6
—
6
_
3
79 0
18
6 6
6
—
79 0
18
6
_
6 6
4
100.0
24
6 6
6 6
100
0 24
6 6
6 6
1
25 C
6
6
_
_
25 0
6
— —
6
—
160
2
50 0
12
6
6
50.0
12
Ó _
6
_
3
75.0
18
6 6
6
—
75.0
16
6
—
6 6
L i .
100
0 24
6 6
6
6
100
0 24
6 6
6
6
NOTE: Circuits and compressors numbered from ieft to right when
viewed from front of unit.
*Transfer Switch, manuaily operated
tCompressor No. 2 on two-compressor units.
Controi circuit power is 115 voits; it can be suppiied from
separate source or thru field-instalied accessory transformer Crank
case heaters are in control circuit, ahead of the START-STOP
switch: they are always operative as long as control circuit power
switch is on. Heaters are not affected if unit shuts off by safety
device action.
All units, ЗОН R,HS040 thru 160, have multiple-step temperature
controller,
factory
set
to
maintain
capacity
control
thru
return
chilled water temperature. On units 30HR,HS070 thru 120 the
Capacity
Control
system
includes
a
chilled
water
temperature
controller,
a
step
controller,
and
solenoid-operated
cylinder
unloaders on two compressors. All other units have a four-step
temperature
controller.
Units
ЗОН
R,HS040,050,060
have
a
solenoid-operated
unloader
on
each
compressor.
Units
30HR,HS140,160 have no unloaders.
Units 30HR,HS070 thru 120 have a separate control circuit
power
switch,
and
each
side
of
line
is
fused.
Units
30HR,HS040,050,060,140
and
160
have
one
double-pole
circuit
breaker, which serves as control circuit power switch and circuit
protection
Units 30HR,HS040,050,060 — Assume control circuit is powered
and circuit breaker is on. When START-STOP switch is turned to
"Start,” panel light will come on, control relays will be energized,
and timer motor will start. If temperature controller is calling for
cooling,
no
1
compressor
will
energize
in
0
to
5
minutes
depending on position of timer. If no 2 compressor is required, it
will start 15 seconds after no. 1. Timer motor stops at 15-second
point and temperature controller takes over, cycling compressors off
and on and loading and unloading cylinders in each compressor to
control cooling capacity in response to load requirements.
A recycle relay energized thru the timer ensures automatic
restart after power interruption, with a 5-minute delay from time
power is restored. Starting sequence same as above
Units 30HR,HS070 thru 120; When START button is depressed, a
24-volt transformer in the step controller is energized to provide
power
to
a
low-voltage
motor
wired
for
rotating
a
camshaft
clockwise
(unloading)
and
counterclockwise
(loading)
Factory-set
cams operate load switches which start or stop compressors and load
or unload cylinders to increase or decrease unit capacity as required.
Motor windings of camshaft drive motor are energized by a
balancing
relay
which
contains
windings
in
temperature
bridge
circuit
between
chilled
water
temperature
controller
and
motor
balancing potentiometer located at end of camshaft. When unit is
loading
or
unloading,
chilled
water
temperatures
correspond
to
respective positions of the camshaft. Camshaft rotation is limited in
each direction by limit switches.
Step controller also includes a recycle relay which ensures that
camshaft is fully recycled to unloaded position at start-up or after a
power interruption. After camshaft has recycled to unload position,
temperature
controller
starts
camshaft rotation
in
load
direction
which starts compressors in sequence, assuring staggered compressor
starting. While unit is operating, the cams on the step controller
protect compressors against rapid cycling.
To restart after power interruption, START button must be
manually depressed
Units 30HR,HS140,160 — Assume control circuit is powered and
circuit breaker is on. When START-STOP switch is turned to
"Start," panel light will come on, control relays 1 thru 4 will be
energized and timer motor will start. If temperature controller is
calling for cooling, one compressor will energize after delay of 10
seconds to 6 minutes depending on position of timer. Depending on
cooling
demand,
the
other
compressors
will
energize
at
brief
intervals until load requirements are satisfied. Thereafter, tempera
ture controller will cycle compressors off and on to control cooling
capacity in response to load requirements
A recycle relay energized thru the timer ensures automatic
restart after power interruption, with a 5-minute delay from time
power is restored. Starting sequence same as above.
15