Installation and Operating Manual
Leaving Water Controller, AS-UNT33n-1
Applied to ALR C/D/E and WHR D/E
IOM UNT33n
Group: Chiller
Date: May 2000
Supersedes: IM 552
© 1996 McQuay International
Table of Contents |
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Introduction........................................................................................ |
3 |
Specifications ..................................................................................... |
4 |
Installation.......................................................................................... |
5 |
Dimensional Data................................................................................ |
6 |
Electrical Data..................................................................................... |
7 |
Operation ........................................................................................... |
9 |
Additional Features ............................................................................ |
11 |
Settings And Adjustments.................................................................. |
12 |
System Checkout and Troubleshooting.............................................. |
13 |
Zone Terminal User's Guide.............................................................. |
16 |
Zone Terminal Glossary .................................................................... |
21 |
"McQuay" is a registered trademarks of McQuay International ©1996 McQuay International
"Illustrations and information cover McQuay International products at the time of publication and we reserve the right to make changes in design and construction at anytime without notice"
2 |
IOM UNT33 |
Introduction
This controller is the standard controller on ALR "C", "D" or “E” vintage and WHR "D" or "E" vintage packaged chillers where control of leaving water temperature is desired. On these units with the controller factory installed, the control is pre-set and calibrated and should not need any adjustment other than the control setpoint.
For further information on the AS-UNT33n-1 Microprocessor based leaving water controller and accessories contact McQuay International for specification sheets for each individual control.
The controller and sensor covered in this Installation and Operating Manual is also available as a substitute replacement for earlier ALR and WHR units.
General Description
The AS-UNT33n-1 Microprocessor-based Leaving Water Control is designed to control multiple capacity steps of cooling from a single sensor.
The AS-UNT33n-1 operation is based on an adjustable Setpoint and Control Band as shown in the OPERATION section of this document. If the leaving chilled water temperature begins to rise to the desired Setpoint plus Control Band/2 (upper limit), Cooling Stage 1 brings on the first stage of cooling. Additional stages of cooling will follow as long as the leaving water temperature remains above the upper limit of the Control Band. As the leaving water temperature begins to drop to Setpoint minus Control Band/2 (lower limit), cooling stages will begin to de-energize.
There will be no energizing or de-energizing of cooling stages as long as the leaving water temperature is between the upper and lower limits of the Control Band.
As a rule, anytime the leaving water temperature is above the upper limit of the Control Band, stages will be energized, and anytime the leaving water temperature falls below the lower limit of the Control Band, stages will be de-energized.
At the initial start of the unit a time delay will occur. There is a 60 second Interstage On Delay between stages. Each stage incorporates minimum on and off timers with a maximum cycle rate of six cycles per hour.
CAUTION-Offering this control device is not intended to imply that rapid cycling of compressors is condoned. If an application produces rapid cycling, the control and/or the application must be reviewed and altered to prevent compressor failure.
Table 1, Standard Control Characteristics
DESCRIPTION |
SETTING |
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AS-UNT-33n-1 |
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Setpoint Range |
10°F to 60°F (-12°C to |
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+15°C) Adjustable |
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Control Band Range |
0°F to 10°F (0°C to 6°C) |
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Adjustable |
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Interstage On Delay Between Stages |
60 seconds |
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Minimum Off Time (each stage) |
5 minutes |
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Minimum On Time (each stage) |
60 seconds |
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Soft Start During Start-up |
50% command over 5 |
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minutes |
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Table 2, Controller Specific Characteristics
CONTROLLER |
NUMBER OF |
LEAVING WATER |
DESCRIPTION |
STAGES |
SENSOR |
AS-UNT330-1 |
4 or 6 |
Honeywell |
AS-UNT332-1 |
8 |
Honeywell |
AS-UNT334-1 |
4 or 6 |
Johnson Controls |
AS-UNT336-1 |
8 |
Johnson Controls |
IOM UNT33 |
3 |
Specifications
Electrical Ratings:
Input voltage and frequency (terminals
24 VAC–COMMON) 20 to 30 VAC at 50/60 Hz
(50 Hz requires download.)
Power Consumption:
25 VA at 24 VAC and 50/60 Hz
Input Signal:
Honeywell sensor—positive temperature coefficient of 4.8 ohms/Degree F; resistance of 3484 ohms at 77°F.
Johnson Controls sensor—positive temperature coefficient of 3 ohms/Degree F; resistance of 1000 ohms at 70°F.
.
Table 3, Contact Rating
Number of Stages Selection:
Refer to Table 5, Figure 1 for stage selection
Temperature Ranges:
Ambient: -40°F to +150°F.
Humidity Rating:
5 to 90% RH non-condensing.
Leaving Water Sensor:
The Honeywell C7173Al017, Honeywell C7170A1010, or Johnson Controls TE-6300-300 senses Leaving Water Temperature on control terminals AI3 and AI3 COM.
CONTACT |
VOLTAGE (V) |
INRUSH (VA) |
RUNNING (VA) |
N.O. |
24 |
240 |
60 |
N.C. |
24 |
75 |
30 |
N.O. |
120/240 |
750 |
75 |
N.C. |
120/240 |
240 |
40 |
Table 4, Accessories
Model No. |
McQuay |
Quantit |
Description |
Application |
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Part No. |
y |
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Johnson TE-6313P-1 |
070312301 |
1 |
Outdoor Air Sensor |
Used for reset of Leaving Water Setpoint. |
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Johnson TE-6300-300 |
070312401 |
1 |
Immersion Sensor (30 ft. cord) |
Senses Leaving or Return Water Temperature. |
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Sensor Well |
047441506 |
1 |
Immersion Well |
Used with TE-6300-300. |
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Johnson TE-6410S- |
070312801 |
depends on |
Zone Temperature Sensor |
Used for zone temperature reset. |
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2000 |
# of zones |
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Johnson AS-ZTU330- |
070312701 |
1 |
Zone Terminal |
Used for monitoring and local control of |
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1 |
designated points. |
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Honeywell |
048442405 |
1 |
Immersion Sensor (30 ft. cord) |
Sensing of Leaving Water Temperature. |
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C7173A1017 |
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Honeywell |
048442402 |
1 |
Immersion Sensor (10 ft. cord) |
Sensing of Leaving Water Temperature. |
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C7170A1010 |
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Honeywell 121371A |
048442403 |
1 |
Copper Immersion Well |
Used with C7173A1017 or C7170A1010. |
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Honeywell 121371E |
048442404 |
1 |
Stainless Steel Immersion Well |
Used with C7173A1017 or C7170A1010. |
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Johnson AS-KIT100-0 |
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1 |
Resistor Test Kit |
Used for field diagnostics. |
4 |
IOM UNT33 |
Installation
STANDARDS COMPLIANCE
The UNT Controller complies with the following standards: |
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* CSA C22.2 No. 205 * UL 916 |
* IEEE 472 |
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* IEEE 446 |
* VDE 0871 Class B |
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* IEEE 587 Category A |
* IEEE 518 |
* FCC Part 15, Subpart A, Cl. J |
* NEMA ICS 2, Part 2-230 |
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All wiring must comply with local codes and ordinances:
1.Disconnect power before making connections to avoid electrical shock or equipment damage.
2.Check ratings given in the specification and on the product to make sure the controller fits the application.
3.Choose a location for the AS-UNT33n-1 controller that is not exposed to the weather and where controls, connections, and the zone bus phone jack are accessible.
4.Mount the controller with three No. 8 screws through the mounting holes in the base. (See Figure 2.)
5.Install immersion well and sensor bulb in the Leaving Chilled Water piping as instructed by the installation manual for the unit being controlled.
6.Connect 24 VAC to terminals marked 24 VAC and COM. CAUTION: Never spark the 24 V power leads to check for power.
CAUTION: Do not run low-voltage wiring in the same conduit as line-voltage wiring (30 VAC or above) or wiring that switches power to highly inductive loads (such as contactors, coils, motors, or generators).
7.Wire the compressor and capacity controls steps to the individual controller relay terminals as shown in the unit wiring diagram.
8.Adjust SW1 and SW2 on AI2 for the appropriate number of cooling stages. The AS-UNT330-1/AS-UNT334-1 is factory set for 6 stages by Johnson Controls. The AS-UNT332-1/AS-UNT336-1 is factory set for 8 stages.
Table 5, Dipswitch Settings
Dipswitch Settings |
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Factory |
Stage |
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Factory Set |
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Set |
Select |
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AS-UNT33n-1 |
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AI 1 |
AI 2 |
AI 3 |
AI 4 |
AI 5 |
AI 6 |
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AS-UNT330-1 |
SW2 |
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10 V |
∙ |
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∙ |
∙ |
∙ |
AS-UNT334-1 |
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2 V |
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∙ |
∙ |
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4 stage |
SW1 |
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T |
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∙ |
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(set by others) |
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V |
∙ |
∙ |
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∙ |
∙ |
∙ |
AS-UNT330-1 |
SW2 |
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10 V |
∙ |
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∙ |
∙ |
∙ |
AS-UNT334-1 |
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2 V |
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∙ |
∙ |
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6 Stage |
SW1 |
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T |
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∙ |
∙ |
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(Factory Set) |
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V |
∙ |
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∙ |
∙ |
∙ |
AS-UNT332-1 |
SW2 |
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10 V |
∙ |
∙ |
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∙ |
∙ |
∙ |
AS-UNT336-1 |
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2 V |
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∙ |
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8 Stage |
SW1 |
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T |
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∙ |
∙ |
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(Factory Set) |
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V |
∙ |
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∙ |
∙ |
∙ |
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Figure 1, Analog Input Switches
1 |
2 3 4 |
5 6 7 8 |
O F |
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A S- UN T3 3 0 - 1
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C |
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5V |
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A N A LO G I N PU TS |
+1 |
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B NI A RY O U TP U T |
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B NI A R Y NI |
C O M |
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1 |
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TO |
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PW R |
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ZONE |
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TATS |
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I N |
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A N A L O G I N P U TS |
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B NI A R Y C O M |
2 4V |
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2 4V A C TO L O A D S |
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C O MM O N |
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A C |
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123 456
OF
A NAL O G I N PUTS |
B I N ARY I N |
B I NA RY O UT PUT S
A N A L O G I N PU TS
Analog Input Switches
IOM UNT33 |
5 |
Dimensional Data
Figure 2, Dimensional Data
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5.80 |
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1.24 |
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These relays are for the |
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7th and 8th stages. |
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C |
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COOL6 |
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COOL 8 |
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B |
McQuay |
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C |
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RECIP ROCATING |
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A |
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CHILLERCONTROL |
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C |
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A |
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COOL 7 |
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SETPOINT |
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C |
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COOL5 |
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A |
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B |
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COOL4 |
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C |
8.95 |
9.23 |
8.95 |
7.78 |
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RESET |
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B |
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A |
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COOL3 |
C |
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COOL2 |
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CONTROL BAND |
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C |
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SW2 |
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B |
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SW1 |
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A |
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ANALOG INPUTS |
BINARY IN |
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COOL1 |
C |
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BINARY OUTPUTS |
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A |
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0.89 |
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14.90 |
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= mounting holes
5.16
2.23 0.25
0.74
2.17 |
2.77 |
6 |
IOM UNT33 |
Electrical Data
Figure 3, Wiring Diagram
Note: See Additional Features on page 11 for explanation.
DEMAND LIMIT*
(1)0-10 VDC
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25 |
528 |
LEAVING |
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26 |
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WATER SENSOR |
529 |
SHUTDOWN*
COMP LEAD/LAG*
ICE MODE*
(2)FLOW INTERLOCK
*Indicates
18
optional 
512/518 feature. 24VAC
28 |
519 |
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(+)
(-)
2 N 2 N F RE Z OM C 24 + - S U B C A V
AI CM 
AI1
AI CM |
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AI2 |
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ANALOG |
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AI CM |
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AI3 |
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AI CM |
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AI4 |
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INPUTS |
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AI CM |
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AI5 |
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AI CM |
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AI6 |
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+15VDC +15VDC |
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BINARY |
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24VAC |
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BI1 |
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24VAC |
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BI2 |
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24VAC |
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BI3 |
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IN |
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24VAC |
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BI4 |
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P5 |
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DS |
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P6 |
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P4 |
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(1)Sensor for Outdoor, Return Water, or Zone Temperature Reset options are connected to AI-1 and
(2)Field connections must be made between TB3-18 and BI-4 for unit to operate.
NNotes:
1.Sensor for Outdoor, Return Water, or Zone Temperature Reset options are connected to Al-1 and Al-CM.
2.Field connections must be made between TB3-18 and Bl-4 for unit to operate.
3.If a time clock is desired, it should be installed between 24 VAC and Bl1. The time clock switch should be installed as follows: Open to Run and Close to Stop.
Figure 4, Stage Relay Configuration |
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COOL 6 |
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COM |
McQuay |
CHILLERCONT ROL |
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C |
C |
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B |
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RECIPROCATING |
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S ET PO I NT |
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A |
NC |
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COOL 5 |
C |
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B |
B |
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COOL 4 |
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C |
NO |
RE SET |
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A |
A |
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COOL 3 |
C |
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B |
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A |
Stage Relays |
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COOL 2 |
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C ONT ROL BA ND |
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C |
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B |
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COOL 1 |
C |
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Note: Refer to Unit Wiring Diagram for Stage Wiring.
IOM UNT33 |
7 |
Table 6, Wiring Location Cross Reference
Lead # |
Honeywell (H/W) |
Stages |
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Johnson Controls (JCI) |
W7100G |
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AS-UNT33n-1 |
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512 |
TB3-18 to TB3-29 |
(4,6,8 Stages) |
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Not Needed (See Note 1 and 2) |
518 |
TB3-29 to "TR" |
" |
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TB3-18 to 24 VAC |
519 |
"TR" |
" |
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Common |
522 |
Ground |
" |
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Not Needed |
524 |
"7" |
" |
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Not Needed (See Note 3) |
525 |
TB3-23 to TB3-24 |
" |
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Not Needed |
526 |
"6" |
" |
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Not Needed (See Note 3) |
527 |
"P" to "P1" |
" |
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Not Needed or Zone Terminal Adjust |
528 |
"T" |
" |
AI-3 |
(JCI or H/W Leaving Water Sensor. See |
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appropriate sensor section) |
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529 |
"T1" |
" |
AI-CM (JCI or H/W Leaving Water Sensor. |
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See appropriate sensor section) |
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400 OHM Resister |
"7" to "8" |
4 Stages |
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600 OHM Resister |
"7" to "8" |
6 Stages |
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See Table 5 |
800 OHM Resister |
"7" to "8" |
8 Stages |
|
|
523 |
Ground |
8 Stages |
|
Not Needed |
535 |
"1" |
" |
|
Not Needed |
536 |
"2" |
" |
|
Not Needed |
537 |
"3" |
" |
|
Not Needed |
538 |
"4" |
" |
|
Not Needed |
539 |
"5" |
" |
|
Not Needed |
Note 1: To install Flow Switch Contacts, connect between TB3-18 and UNT BI-4. Note 2: To install Time Clock Contacts, connect between TB3-18 and UNT BI-1.
Note 3: The options are as follows. (Option A is standard; options B, C, and D require field download. See "Features Requiring Configuration and/or Field Adjustment" section for more information):
A. The standard is Demand Limit Input. 0-10VDC signal is required. Connect leads to AI-1 and AI-CM on the
controller.
B.Johnson Controls Outdoor Air Sensor if Outdoor Air Reset is used.
C.Johnson Controls Zone Temperature Sensor if Zone Temperature Reset is used.
D.Johnson Controls Return Water Sensor if Return Water Reset is used.
8 |
IOM UNT33 |
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