PolyScience Refrigerated Recirculating Chillers User Manual

Section 9 - RS232
Serial Connector — A 9-pin D-connector is provided on the back panel of the Chiller for RS232 data
communication. A serial cable that uses only the following pins should be used to connect the Chiller
to the computer:
Pin #2 — data read (data from computer)
Pin #3 — data transmit (data to computer)
Pin #5 — Signal ground
RS232 Protocol — The Controller uses the following RS232 protocol:
Data bits — 8
Parity — None
Stop bits — 1
Flow control — None
Baud rate — Selectable (Chiller and PC baud rates must match).
Communications Commands — Commands must be entered in the exact format shown. Do not send a
[LF] (line feed) after the [CR] (character return). Be sure to follow character case exactly. A response
followed by an exclamation point (!) indicates that a command was executed correctly. A question mark
(?) indicates that the Chiller could not execute the command (either because it was in an improper
format or the values were outside the allowable range). A response must be received from the Chiller
before another command can be sent. All responses are terminated with a single [CR].
Command Description Command Format Values Return Message
Set Commend Echo SEi[CR]
Echo: i = 1
No Echo: i = 0
![CR]
Set On / Off SOi[CR]
On: i = 1
Off: i = 0
![CR]
Set Set Point SSxxx[CR] x = ASCII digit ![CR]
Read Set Point Temperature RS[CR]
+xxx.x[CR] or
-xxx.x[CR]
Read Temperature RT[CR]
+xxx.x[CR] or
-xxx.x[CR]]
Read Temperature Units RU[CR] C or F C[CR] or F[CR]
Read Status RW[CR]
1 = Run
0 = Standby
1[CR] or 0[CR]
Read Pressure in PSI RP[CR] +nnn.n[CR]
Read Pressure in kPa RK[CR] +nnn.n[CR]
Read Flow in GPM RG[CR] +nnn.n[CR]
Read Flow in LPM RL[CR] +nnn.n[CR]
Read Remote Control
Voltage
RC[CR] +nnn.n[CR]
Read Compressor
Discharge Temperature (°C)
RH[CR]
+xxx.x[CR] or
-xxx.x[CR]]
Read Remote Probe
Temperature
RR[CR]
+xxx.x[CR] or
-xxx.x[CR]]
Read Ambient temperature
on PCB
RA[CR]
+xxx.x[CR] or
-xxx.x[CR]]
Read internal temperature R1[CR]
+xxx.x[CR] or
-xxx.x[CR]]
Read external temperature R2[CR]
+xxx.x[CR] or
-xxx.x[CR]]
Read fault status
(see Section 4.8 for fault
message codes)
RF[CR]
00 = System OK
18 = Standby mode
02 – 17 = Fault
![CR]

PolyScience Refrigerated Recirculating Chillers Specifications

General

Dimensions	Varies by model
Weight	Varies by model
Pump Type	centrifugal
Refrigerant	R404A
Display	Digital
Safety Features	Over-temperature protection
Communications	RS232
Power Requirements	115V/60Hz or 230V/50Hz (varies by model)

Summary

General Information and Warranty

Warranty Information

Details the manufacturer's warranty terms and conditions for the product.

Unpacking Instructions

Guidance on safely unpacking the chiller and checking for transit damage.

Chiller Overview and Specifications

Chiller Description

Provides a general description of the refrigerated recirculating chillers and their features.

Installation and Startup Procedures

Site Requirements

Specifies site selection, ambient temperature, humidity, and clearance needs.

Electrical Power and Connections

Details electrical power requirements, grounding, and connection guidelines.

Optional Signal Inputs/Outputs

Describes optional external temperature probe and serial communication connections.

Plumbing and Piping

Covers process piping, tubing, fittings, and reservoir drain connections.

System Setup Configurations

Explains setup for closed systems, cooling coils, and open bath systems.

Startup Procedure

Step-by-step guide for filling the reservoir and initiating system operation.

Chiller Operation and Controls

Temperature Unit Selection

How to switch between Celsius (°C) and Fahrenheit (°F) temperature displays.

Set Point Adjustment

Procedure for displaying and adjusting the desired set point temperature.

Ambient Tracking Offset Adjustment

How to display and adjust the ambient tracking offset value.

Remote Temperature Control Adjustment

How to display and adjust the external temperature set point.

Pressure/Flow Rate Display Selection

How to select and view pressure or flow rate units.

Internal/External Temperature Display

Switching between internal and external temperature readings.

Setting Operational Parameters

Configuration of various operational parameters like alarms and set points.

Display, Alarm, and Error Messages

Explains message codes, descriptions, and required actions for faults.

High Pressure Bypass Setting

Procedure for adjusting the automatic high pressure bypass setting.

Local Lockout Feature

How to enable or disable the local lockout feature for parameter protection.

Maintenance and Calibration

Pump Maintenance

Instructions for maintaining the standard magnetic drive centrifugal pump.

Cleaning Condenser, Vents, and Filter

Guidance on cleaning the condenser, air vents, and reusable filter for optimal performance.

Fluid Filter and Level Check

Procedures for cleaning the fluid filter and checking the fluid level.

Temperature and Flow Rate Calibration

Methods for calibrating temperature and flow rate readings for accuracy.

Troubleshooting Guide

Unit Not Operating or Pumping

Steps to diagnose and resolve issues with the unit not starting or pumping.

Pumping Issues

Troubleshooting steps for no pumping or insufficient pumping.

Cooling Issues and Faults

Diagnosing and addressing no cooling, insufficient cooling, triac, and probe faults.

Diagnostic Mode Usage

How to access and use the diagnostic mode for troubleshooting.

Service and Technical Support

Electrical Wiring Diagram

Provides a detailed electrical wiring diagram for the chiller.

Process Flow Diagram

Illustrates the process flow of the chiller, including components and fluid paths.