Emerson PMAC II User manual

Pulse Modulating Anti-Sweat Control
(PMAC II) Installation and Operation
Manual
026-1501 Rev 6

Emerson
1065 Big Shanty Road NW, Suite 100
Kennesaw, GA 30144, USA
Phone [phone]
Fax: [phone]
Please Note: This manual covers the PMAC II (P/N 851-1000) family of anti-sweat 
panels. Information on the PMAC II Solo (P/N 851-1100) anti-sweat controller is 
contained in P/N 026-1503, PMAC II Solo Installation and Operation Manual.

Table of Contents • i
Contents
1 OVERVIEW ................................................................................................................................................................... 3
1.1. FEATURES ..................................................................................................................................................................... 3
2 INSTALLATION ........................................................................................................................................................... 4
2.1. LOCATION AND WIRING ............................................................................................................................................... 4
2.1.1. PMAC II Field Wiring........................................................................................................................................... 5
2.2. 8DO BOARD CONFIGURATION (STANDARD PMAC II ONLY) ..................................................................................... 6
2.2.1. Digital Outputs...................................................................................................................................................... 6
2.2.2. Fail-Safe Dip Switch ............................................................................................................................................. 6
2.2.3. Network Jumpers................................................................................................................................................... 6
3 ALARM CONFIGURATION....................................................................................................................................... 8
3.1. THE ALARM CONTACTS ON THE PMAC II TERMINAL STRIP ...................................................................................... 8
3.1.1. Connecting the Alarm Contacts to an Input Board............................................................................................... 8
3.2. PANEL OVERHEAT ALARMING (ALL MODELS) ............................................................................................................ 8
3.2.1. Overheat Warning................................................................................................................................................. 8
3.2.2. Panel Overheat Shutdown..................................................................................................................................... 8
4 CONFIGURING RMCC, BEC, EINSTEIN AND E2 ................................................................................................ 9
4.1. BEC AND RMCC PAGE LAYOUT ................................................................................................................................. 9
4.2. PROGRAMMING THE BEC............................................................................................................................................. 9
4.2.1. Input Definitions ................................................................................................................................................... 9
4.2.2. Output Definitions................................................................................................................................................. 9
4.2.3. Dewpoint/Humidity Offsets ................................................................................................................................... 9
4.2.4. Outputs Setup ........................................................................................................................................................ 9
4.2.5. Setpoints .............................................................................................................................................................. 10
4.3. PROGRAMMING THE RMCC ....................................................................................................................................... 10
4.3.1. Input Definitions ................................................................................................................................................. 10
4.3.2. Output Definitions............................................................................................................................................... 10
4.3.3. Dewpoint/Humidity Offsets ................................................................................................................................. 10
4.3.4. Anti-Sweat Circuit Setpoints ............................................................................................................................... 11
4.4. PROGRAMMING THE EINSTEIN OR E2......................................................................................................................... 11
4.4.1. Adding an Anti-Sweat Application...................................................................................................................... 12
4.4.2. Configuring Anti-Sweat Applications ................................................................................................................. 12
5REPLACEMENT PARTS LIST ................................................................................................................................16

Features Overview • 3
1 Overview
The Pulse Modulating Anti-Sweat Control (PMAC II,
P/N 851-1000), shown in Figure 1-1, is a solid state, anti-
sweat heater controller designed to dramatically reduce the
cost of operating anti-sweat heaters on low-temperature
door-type cases found in most supermarkets.
Normally, anti-sweat heaters operate continuously with
no controls, even though 100% operation is required only
when in-store humidity levels are high. A PMAC II pro-
vides a means for pulsing power to the heaters based on en-
vironmental conditions, so that heaters will be on for less
time during periods where the in-store dewpoint is low.
This reduces operating costs by limiting heater operation,
and increases heater life by limiting heat cycle fatigue since
the heaters are rarely turned off completely.
Depending on the model selected, the PMAC II may
have 16, 20, or 28 heater channels available. Each channel
supports a load of up to 16 amps.
The PMAC II relies on a site controller to control anti-
sweat heater ON percentage based on the in-store dew-
point. The PMAC II panel is compatible with the Building
Environmental Control (BEC), Refrigeration Monitor and
Case Control (RMCC), and Einstein RX or BX, or an E2
site controllers.
The RMCC is capable of controlling up to eight heater
circuits in a single zone, while the BEC allows PMAC II-
controlled heater circuits to be operated in two separate
zones. Two-zone control allows heaters in higher humidity
zones, such as door cases near prep rooms, to be controlled
separately from other case heaters. An E2 RX or BX can be
configured with up to eight zones.
1.1. Features
• Full Solid-State Control
• Quiet Operation
• Easily added to existing systems
• Remote communications through the BEC, RMCC,
Einstein RX/BX, or E2 controllers
• Controlled by the store environment (humidity and
temperature)
•Centrally-located panel
• Easy installation
Figure 1-1 - PMAC II Detail

4 • PMAC II I&O Manual 026-1501 Rev 6
2 Installation
This section of the manual covers wiring and installa-
tion for the PMAC II panels.
2.1. Location and Wiring
The following steps provide location and wiring in-
structions for the PMAC II panel. Figure 2-3 shows this
typical layout. Figure 2-5 shows the PMAC II internal wir-
ing connections.
1. Mount the PMAC II panel in a central loca-
tion such as a motor or electrical room. The
panel should be where there is good air flow
(not in a closet). Keep a 6-12 inch clearance
on top and bottom for good air flow. The
room’s ambient temperature should always
be below 100° F. Figure 2-1 and Figure 2-2
have the mounting dimensions.
2. Provide 120 VAC (15 amp circuit) to the
PMAC II panel through a store circuit break-
er. See the layout design in Figure 2-3.
3. Provide power to the case heaters from the
store circuit breaker panel through the
PMAC II panel terminal strip using #10-12
AWG wire, as shown in Figure 2-4.
Figure 2-1 - PMAC II Dimensions for the 16 and 20 Channel
Figure 2-2 - PMAC II Dimensions for the 28 Channel
24.0”
20.0”
8.0”
Mounting
Holes
16.75”
17.8”
35.0”
27.0”
8.0”
Mounting
Holes
24.5”
26.0”
WARNING: For proper cooling, the door
must be closed at times when unit is in opera-
tion.
Figure 2-3 - Typical Layout
Figure 2-4 - Typical Heater Wiring Layout

Location and Wiring Installation • 5
4. Connect the PMAC II panel 8DO board to the
existing RMCC or BEC COM A or COM D
network, as shown in Figure 2-5, using a
Belden #8761 (two-conductor, shielded,
22AWG) or equivalent communication ca-
ble.
2.1.1. PMAC II Field Wiring
1. Provide 120VAC (15 amps circuit) to the
PMAC terminal block through a store circuit
breaker. Wire 120VAC Hot, 120 VAC Neu-
tral, and Ground as indicated by the Step 1
arrows of Figure 2-5 for the 16 Channel, Fig-
ure 2-6 for the 20 Channel, and Figure 2-7
for the 28 Channel.
2. A normally closed alarm contact is provided
on the terminal strip as indicated by the Step
2arrows of Figure 2-5 for the 16 Channel,
Figure 2-6 for the 20 Channel, and Figure 2-
7for the 28 Channel.
3. Step 3 of Figure 2-5 for the 16 Channel, Fig-
ure 2-6 for the 20 Channel, and Figure 2-7
for the 28 Channel indicates the terminal
block positions to wire the Emerson 485 I/O
Network. Polarity must be respected while
mak-ing these connections.
2.1.1.1. Single Channel Expansion Ports
The 20 Channel PMAC has two expansion ports (Fig-
ure 2-6), and the 28 Channel PMAC has six single expan-
sion ports (Figure 2-7). These expansion ports can be used
to attach single channel PMACs if desired (P/N 851-1010).
NOTE: When running power to the case heat-
ers, include the neutral lead in the same con-
duit as the hot lead to prevent conduit
overheating.
Figure 2-5 - Wiring Detail for 16 Channel
Figure 2-6 - Wiring Detail for 20 Channel
120 HOT
120 NEUTRAL
RS 485+
OV
RS 485-
GROUND
ALARM
ALARM
TO EARTH GROUND
Step 1 Step 3
Step 2
Humidity
+12V
Ground
HiTemp
AlarmNC
120VAC
Neutral
120VAC
Hot
COM485
black-
COM485
white+
Hi Temp
AlarmNC
COM485
shield
ExpB
12VDC+
ExpB
12VDC-
ExpA
12VDC-
ExpA
12VDC+
St 1 St 2 S
Expansion Ports x 2
Figure 2-7 - Wiring Detail for 28 Channel
SC-PMAC
#5+
SC-PMAC
#5-
SC-PMAC
#4-
SC-PMAC
#4+
SC-PMAC
#3+
SC-PMAC
#3-
SC-PMAC
#2+
Alarm
Alarm
Ground
120VAC
Neutral
COM485
shield
COM485
white +
SC-PMAC
#1+
COM485
black-
SC-PMAC
#2-
SC-PMAC
#1-
SC-PMAC
#6+
SC-PMAC
#6-
FUSE
120VAC
HOT
Step 1 Step 3Step 2
Expansion Ports x 6

6 • PMAC II I&O Manual 026-1501 Rev 6
2.2. 8DO Board Configuration
(Standard PMAC II Only)
The 8DO (Digital Output) Expansion Board, supplied
with the PMAC II panel, and shown in Figure 2-8, is used
to connect refrigeration and environmental control compo-
nents, which must be controlled by digital output, to an RS-
485 I/O Network. An adjustable dip switch, rotary dials,
and jumpers are used to configure the 8DO board to fit a va-
riety of applications. Table 2-1 provides the required infor-
mation to configure the 8DO board to allow
communication between the RMCC, E2 or BEC, the
PMAC II panel, and the case heaters.
2.2.1. Digital Outputs
The 8DO Expansion Board uses eight digital outputs,
which modulate at a programmable frequency regulated by
a signal sent from the controller via the I/O Network.
Each of the eight outputs is designed to drive a solid-
state device, and is capable of supplying approximately
150 mA at +12 volts (unregulated). Each output has current
limiting circuitry to prevent damage when short-circuited.
When an output is overloaded, the corresponding LED in-
dicator flashes quickly, indicating current limiting is in ef-
fect.
2.2.2. Fail-Safe Dip Switch
The fail-safe dip switch, S3, allows the user to provide
continuous voltage to the case heaters during network com-
munication loss. The fail-safe dip switches should always
remain in the UP position to ensure voltage is always pro-
vided to the case heaters. If the switches are set in the
DOWN position, no voltage will be sent to the heaters dur-
ing network communication loss.
2.2.3. Network Jumpers
The network jumpers—JU1, JU2, and JU3—define
whether the PMAC II 8DO board is the first or last board,
or a middle board on the RS-485 communication network.
Figure 2-8 - 8DO Board
NOTE: Connection of the PMAC II panel
8DO board must meet all networking require-
ments of the BEC, RMCC, or E2 controllers.
Table 2-1 defines the proper settings for the
PMAC II 8DO board. Refer to the controller’s installa-
tion and operation manual for further information.
Component Required
Setting
Action/Notes
Fail-Safe Dip
Switch (S3)
Positions 1-4,
UP Position 5,
unused
Provides continuous
12VDC to the PMAC
II relays during net-
work communica-
tion loss.
Rotary Dials
(S1)
(S2)
0
1
Addresses the PMAC
II 8DO board as the
#1 8DO board on the
RS-485 Network.
Jumpers
JU1
JU2
JU3
UP/DOWN
UP/DOWN
UP/DOWN
If the PMAC II 8DO
board is the last board
on the RS-485 Net-
work, set all three of
the jumpers UP. If the
board is in the middle
of the RS-485 Net-
work, set the jumpers
DOWN.
Network Connec-
tion
Connect to
RS-485 Net-
work
Must “daisy-chain"
with other network
boards.
Table 2-1 - PMAC II 8DO Setup

8DO Board Configuration (Standard PMAC II Only) Installation • 7
Power Connection
The PMAC II 8DO board requires 24VAC (center tap
ground) from the PMAC II transformer and converts it to
12VDC to drive the PMAC II relays.
Network Connection
RS-485 Network communication is provided through
the network communication connection as shown in Fig-
ure 2-8, Table 2-1, and described in the Location and Wir-
ing sections of this manual.

8 • PMAC II I&O Manual 026-1501 Rev 6
3 Alarm Configuration
This section explains the alarm capabilities of the
PMAC II and how to set up alarm annunciation and/or re-
porting using the panel’s ALARM output contacts.
3.1. The Alarm Contacts on the
PMAC II Terminal Strip
The terminal strip at the bottom the PMAC II interior
has two terminals labeled ALARM, which are Normally
Closed, and which OPEN whenever certain abnormal sys-
tem conditions occur.
3.1.1. Connecting the Alarm Contacts to
an Input Board
You may wish to connect the digital ALARM output
from the PMAC II panel to a digital input on an Emerson
16AI board or other input device, so that the status of the
PMAC II can be monitored by the central site controller.
Refer to your site controller’s user manual for
information on how to do this. Set up the ALARM output
as a standard digital sensor that is OPEN during alarm
conditions and CLOSED when the system isfunctioning
normally.
If the ALARM contacts are connected to a point on a
16AI or other input board, you may configure the controller
to generate an alarm or perform some other control func-
tion to respond to this alarm condition. Refer to the control-
ler’s user manual for information on how to do this.
3.2. Panel Overheat Alarming (All
Models)
The PMAC II has a feature that prevents equipment
damage as a result of overheating. When the temperature
inside the panel rises above the warning level (165°F), the
normally closed alarm contact will open. If the temperature
continues to rise and exceeds 180°F, the anti-sweat chan-
nels will be shut down.
3.2.1. Overheat Warning
The "warning level" for the PMAC II panel is 165°F. If
a panel interior temperature above 165°F is reached during
operation, a sensor located on one of the upper heat sinks
will open. In a standard PMAC II panel, this will cause the
ALARM contacts on the terminal strip to be set to OPEN.
3.2.2. Panel Overheat Shutdown
If, after the warning level is reached, the temperature
continues to rise above 180°F, another thermal sensor will
open and the unit will completely shut down. The unit will
remain shut down until the temperature returns to a normal
level.

BEC and RMCC Page Layout Configuring RMCC, BEC, Einstein and E2 • 9
4 Configuring RMCC,
BEC, Einstein and E2
A BEC, RMCC, Einstein, or E2 is capable of control-
ling eight anti-sweat heater circuits. BECs allow the eight
heaters to be controlled in two different zones, RMCCs one
zone, and Einstein & E2’s eight zones. Each zone requires
its own dewpoint sensor and setpoint(s). A humidity sensor
and temperature sensor may be used in lieu of a dewpoint
sensor.
The following sections outline the procedure for setting
up anti-sweat control in the BEC, RMCC, Einstein, and E2.
For detailed information on system programming, users
should consult the site controller’s user documentation.
4.1. BEC and RMCC Page Layout
Each data screen used in anti-sweat setup is shown in
sections to follow. Data ranges for data fields—the infor-
mation supplied in the help prompt lines—are displayed in
brackets and bold type [-99° - 99°] either at the heading for
the particu-lar field description, or—when a heading does
not exist— within the body of the description. Suggested or
default values for a particular entry are always shown in
brackets and bold type immediately following the data
range [-99° - 99°] [-15.5].
4.2. Programming the BEC
4.2.1. Input Definitions
From the Main Menu, press ’7 1’ to access the Input
Definitions screen.
Define 16AI or 8IO board and point addresses for the
anti-sweat humidity and temperature sensors. Use the
down arrow keys to locate the following inputs: (ASC
HUM1, ASC TEMP 1, ASC HUM2, ASC TEMP 2) and
the anti-sweat override inputs (ASC #1 OVRD - ASC #8
OVRD). Refer to P/N 026-1103, Building Environmental
Control I&O Manual, Section 6.10.1., Input Definition, for
more information.
4.2.2. Output Definitions
From the Main Menu, press ’7 2’ to access the Out-
put Definitions screen.
Define 8RO and/or 8DO board and point addresses for
the anti-sweat heater zones. Use the down arrow keys to lo-
cate the following outputs: (ANTI-SWT 1 - ANTI-SWT 8).
Refer to P/N 026-1103, Building Environmental Con-trol
I&O Manual, Section 6.10.2., Output Definition, for more
information.
4.2.3. Dewpoint/Humidity Offsets
From the Main Menu, press ’3 2 1’ to access the
Dewpoint/Humidity Offsets screen.
If the dewpoint cell or relative humidity sensor is
known to read high or low, offsets may be specified in the
Dewpoint Offset and Humidity Offset fields to correctly
calibrate the sensors. Users may enter a value from -20% to
20% or from -20° to 20°.
4.2.4. Outputs Setup
From the Main Menu, press ’3 2 2’ to access the
Anti-Sweat Outputs Setup screen.
Setup data such as heater interval times, names, and
board and circuit assignments are entered in the Anti-Sweat
Outputs Setup screen.
ON/OFF Interval [1 - 999 sec.] [10 sec.]
All anti-sweat circuits pulse heaters ON for a percent-
age of a defined time interval. This interval is entered in the
ON/OFF Interval field. If an 8DO board is being used, the
value should be less than 240 seconds.