Amongst others features, an important one is that
Incase one compressor is not capable of handling the
load, the second compressor will activate and both
compressors will cutout at the lowest set point.
SZ-7552 is two compressor controller with separate
setpoints, differentials and time delays for each
compressor.
The controller features cycling of compressors so that
there is no overload on one compressor.
They are specifically designed for air conditioning
applications wherein the compressor cuts off at setpoint
and is restarted at a temperature of setpoint plus
differential.
Instruction for SZ-7552-P
General Description
1
2
INDEX
4
Parameter
Setting
Press and hold
PRG(prg) key
for 2 seconds.
prg
Display will show ‘P2’ and flash.
To go to other parameters. Use
UP / DOWN keys.
3
Set Point
Function : To set the cutout point
of the controller.
Press & hold
SET key for 2
Seconds.
R1 will flash along with respective
setpoint1 for compressor 1.
The setpoint1 value can now be
changed by using the UP/DOWN
keys. After achieving the desired
value, press the set key and
you will see “- - -” which confirms
that the set point has been stored
in memory.
R2 will flash along with
respective set point 2 for
compressor 2. In the similar
manner use UP/DOWN key to
set the desired value and press
set key to confirm the settings.
Display will change to set point 1
and flash
Set Point 1 & 2
Min Max
Fac
O
1.0 C
Set Point 1 & 2
Min Max
Fac
O
1 C
O
P2-1 C
rS = 0
rS = 1
rS = Resolution
Set Parameter
P3
O
+1.0 C
P2
O
-1.0 C
O
P3+1 C
SZ-7552-P
www.pvrcontrols.com
INDIA
OPERATING
INSTRUCTIONS
Description
Parameter Page
Set Point1 and set point 2.
To Set other parameters.
Controller for heating or cooling.
Max. High Temp Limit.
Min. Low Temp. Limit.
Differential.
Probe Calibration.
Time Delay.
To Start 2nd Comp. incase 1st Comp.
Min. Off time between two Comp.
Avoid over loading of Comp.
Keypad Lock.
Relay status on Probe Failure.
To set controller Resolution.
Factory set parameter.
End Programming.
Operating messages.
Technical data.
Suggested Wiring diagram.
Panel cutout & Dimensions.
P1
P2
P3
P4
P5
P6
t2
t3
t4
LP
E1
rS
FS
EP
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22-23
