MCC Marine Chiller Control Operations Manual Micro Air Corporation Phone (609) 259-2636 124 Route 526. WWW.Microair.
Table of Contents Introduction ..................................................................................................................................... 4 Wiring .............................................................................................................................................. 4 Stand Alone Operation .................................................................................................................... 4 Power Application ..................................
EH / rc .................................................................................................................................... 11 LPd / LPE ................................................................................................................................ 11 Staging Controller Fault Protocol .............................................................................................. 12 Additional Fault Troubleshooting Information..................................................
Introduction The Marine Chiller Control, identified in this document as MCC, can be used as a standalone or staged chiller controller to regulate loop water temperature in tempered water systems. MCC also provides a level of protection against system damages caused by high or low refrigerant pressures, water flow problems, freezing of the compressor, and low line voltage. The MCC can be used to control directly connected compressors, VFD’s, reversing valves, electric heaters and system pumps.
Operating Modes When heat or cool is selected on the mode switch, the display will alternate between showing “SUP” (supply or outlet temperature measured by the freeze sensor), followed by the temperature and “rtr” (return or inlet temperature) followed by the temperature. If the water temperature deviation is 2° or greater from the set point, then the MCC will start a cycle. The compressor will start and continue to operate until the loop return temperature reaches set point. September 28, 2020 5 Rev 2.
Error Messages Message Definition FLO Flow switch has been open for over 10 seconds during the cycle. Operation will resume once the switch closes again. HIP The high refrigerant pressure switch was open. Operation will resume once the switch closes again. Four faults occurring in a cooling cycle will create a lockout. Lockouts can be cleared by switching the mode switch to off then back to the desired mode. LoP The low refrigerant pressure switch was open for more than 10 minutes.
Program Parameters Certain operational attributes can be changed to configure the control. Press the “Select” button on the control to advance from one parameter to the next parameter. Press and hold the “set” button to decrement the parameter. Release the “set” button, then press and hold the button again to increment a parameter. The control will exit the program mode after 15 seconds without a button press.
MCC Staging Controller Introduction The MCC staging controller is a multi-stage controller capable of handling up to 6 chillers and two displays. The MCC staging controller system consists of a circuit board that connects to one or more MCC controls and a display. The display panel shows the active state of each MCC controlled compressor or heater connected, inlet and outlet temperatures for each stage, and the run time hours for each stage. Each compressor in the system is considered a stage.
MCC Staging Controller Programming Caution! Programming should only be performed by qualified service technicians, consult your Microair Air representative before attempting to make any program changes. Entering the program mode There are nine (9) programmable parameters. To enter the program mode turn the system off. With the word OFF visible in the display press and release the Select, Up, Down and Select buttons in the sequence described.
Bypassed Stages: The display will show numbers 1 to 6, six dashes, or a combination of numbers and dashes for each of the possible stages that could be connected. Press and release the down button to advance through each of the six stages. Inactive stages will show as a number and active stages will show as a dash (“-“). Once the desired stage is selected, press and release the up button to change the stage selection. Heating Stages Not all stages are equally equipped in all installations.
Gang staging In some multistage systems it may be desirable for more than one stage to operate at a differential point. Access this parameter using the same method used to access bypassed stages. The first differential point is in the left. Select from 1 to 3 stages to operate with the first differential. Press the up button to move the selection to the second position and use the up button to change the selection for the second differential point.
Staging Controller Fault Protocol The staging controller software includes a fault protocol designed to protect the system while, at the same time, allowing the operational stages to continue cooling or heating. The table below lists the fault and the action taken when the fault occurs.
Additional Fault Troubleshooting Information The HIGH LIMIT SENSOR and RETURN WATER SENSOR are connected to stage one. Because the system cannot operate properly without these sensors, four consecutive high limit failures or four consecutive return sensor failures will cause the system to shut down and lockout. Since all the systems critical components are connected to stage one, the entire system is shut down when stage on fails to communicate with the staging controller.
Bimini Jumpers Four jumpers are provided on the board for troubleshooting and emergency operation. Moving the VLV (valve), SWP (sea water pump), and CWP (loop pump) to cover the two pins closest to the black electric power terminal strip will force those outputs on. Moving the COMP (compressor) jumper will force the compressor relay on only if the freeze temperature is above 42°F (5.6°C). Specifications MCC Board Dimensions 5.25" x 5.875” x 2.0"(133mm x 149mm x 51 mm) Mounting 4.75" x 5.20” (120.
MCC Staging Controller Alarm relay contacts 250 VAC 2A max Water sensors 0.5-4.0 or 1.0-4.5 VDC 0-500 PSI (0-34.5 bar) Interconnect cables Board Dimensions: SUB-059-XXX 4.30" x 3.90” x 2.0"(109mm x 99mm x 51 mm) Interconnect Cable Specification: Flat (oval) multi-conductor shielded modular type cable consisting of stranded tinned copper conductors with thermoplastic insulation and a 22 AWG stranded fused tinned copper drain wire with an overall 100% coverage aluminum/polyester shield in a PVC jacket.
MCC Wiring Diagram September 28, 2020 16 Rev 2.
MCC Staging Controller Diagram Note: Three stages shown. One additional display and three additional controls can be connected. Relay contacts are for external alarm relay. Computer connection is for certain legacy systems only. September 28, 2020 17 Rev 2.
Two Speed Operation Special firmware is required for this operation. Two dry contact relays (COMP and EH on the board) are used to control the compressor start and low speed bypass operation. The following 3 charts detail the operation with the available differential and hysteresis settings. Most users will operate using a differential of 2 and a hysteresis of 2.
Hysteresis = 3 CSP CSP + 1 CSP + 2 CSP + 3 CSP + 4 CSP + 5 CSP + 6 CSP + 7 CSP + 8 CSP + 9 CSP + 10 CSP + 11 CSP + 12 CSP + 13 CSP + 14 CSP + 15 CSP + 16 CSP + 17 CSP + 18 CSP + 19 CSP + 20 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 September 28, 2020 OFF OFF OFF S1 ON S1 ON S1 ON S2 ON S2 ON S2 ON S3 ON S3 ON S3 ON S4 ON S4 ON S4 ON S5 ON S5 ON S5 ON S6 ON S6 ON S6 ON 19 OFF OFF OFF S1 LS S1 LS S2 LS S2 LS S3 LS S3 LS S4 LS S4 LS S5 LS S5 LS S6 LS S6 LS OFF S1 ON S1 ON S1 ON S2 O
MCC Master Display Dimensions Note: All dimensions are in inches. September 28, 2020 20 Rev 2.
COPYRIGHT © 2020 Micro Air Corporation, All Rights Reserved No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise without prior written consent by Micro Air Corporation. Every precaution has been taken in the preparation of this manual to insure its accuracy. However, Micro Air Corporation assumes no responsibility for errors and omissions.
