Installation
&
Operating Instructions
for
SLIMZONE
ENVIRONMENTAL MODULE
(SZEM)
TABLE OF CONTENTS
IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Data Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Bypass System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
High and Low Temperature Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Outdoor Temperature Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SZEM Terminal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Bypass System Operation and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
SZEM Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Pressure Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Bypass Damper Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Bypass System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
High/Low Limits Operation and Installation Operation . . . . . . . . . . . . . . . . . . . . . . . . . .10
Temperature Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Outdoor Temperature Probe Operation and Installation Operation . . . . . . . . . . . . . . . . . .11
Outdoor Temperature Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
IMPORTANT
READ THIS BOOKLET THOROUGHLY IN ORDER TO
UNDERSTAND ALL THE OPERATION FEATURES OF YOUR
ENVIRONMENTAL MODULE.
RECORD THE SERIAL NUMBER IN THE SPACE PROVIDED.
SERIAL NUMBER
DATE OF INSTALLATION
1
SLIMZONE ENVIRONMENTAL MODULE (SZEM)
INTRODUCTION
The Slimzone Environmental Module (SZEM) is an optional component in the Slimzone
Premier system. The module provides the following services:
* Bypass Damper control and static pressure sensing
* High/Low temperature limit signaling
* Outdoor temperature measurement
DATA EXCHANGE
All information collected by the SZEM module is
communicated to the Slimzone Premier control module (SZP) via a RS485 communication port at 1200
baud, 8 bits, no parity, with standard protocol. All
information received by the SZP control module may
be viewed by the user.
BYPASS SYSTEM
In order to maintain proper air flow and static pressure throughout the HVAC system, a
bypass system should be used. In some two zone applications a bypass damper may
2
not be required. This is based on duct sizing where either zone is able to handle approximately 75% of the total system CFM (cubic feet/minute). This will result in only slightly higher
air velocity at the discharge grille if only one zone is calling and yet allow for proper CFM
across the cooling coil.
Bypass activities are fully controlled by the SZEM module, which monitors the system static
pressure and modulates a motorized bypass damper accordingly. The static pressure value is
communicated to the SZP control module.
HIGH AND LOW TEMPERATURE LIMITS
When bypassing conditioned air it is important to consider high and low limit control to prevent coil freeze up or overheating. The SZEM module also monitors the conditioned air temperature and signals the SZP control module when the high and low limits are exceeded.
System air temperature value is communicated to the SZP control module.
OUTDOOR TEMPERATURE MEASUREMENTS
In heat pump applications, the outdoor temperature may be used to determine when to lock
out either the compressor(s) or auxiliary heat (high and low balance points). Outdoor air temperature is communicated to the SZP control module; outdoor temperature value may be displayed at both the SZP module and zone thermostats.
3
SZEM TERMINAL DESCRIPTIONS
Output terminals on the SZEM module are protected by current limiting devices which are
activated when the current draw exceeds 0.3 Amps.
TERMINAL DESIGNATION DESCRIPTION
24 VAC 24 VAC R
24VAC (COMMON) 24 VAC X
DAMPER OPEN DAMPER OPEN
DAMPER COMMON DAMPER COM
DAMPER CLOSE DAMPER CLOSE
OUTDOOR TEMPERATURE PROBE WIRE 1 ODT1
OUTDOOR TEMPERATURE PROBE WIRE 2 ODT2
DISCHARGE AIR TEMPERATURE PROBE WIRE 1 DUCT 1
DISCHARGE AIR TEMPERATURE PROBE WIRE 2 DUCT 2
RS485 COMMUNICATIONS B RS485 B
RS485 COMMUNICATIONS A RS485 A
RS485 COMMUNICATIONS GND DO NOT USE
SZEM Terminal Designations
4
SETUP
TRANSFORMER
The SZEM module requires a separate transformer rated at a minimum of 20 VA to power
the module and the bypass actuator.
LOCATION
CAUTION: Do not mount the SZEM module directly on the ductwork. Temperature fluctua-
tions within the duct will adversely affect the operation of the module.
INSTALLATION
Fasten the module with the two #8 sheet metal screws provided with the module and install
in a convenient location near the bypass damper, allowing for proper placement of the duct
temperature and pressure probes.
BYPASS SYSTEM OPERATION AND INSTALLATION
OPERATION
The SZEM module monitors the system’s static pressure using an electronic duct-mounted
pressure sensor with a range of 0 to 1" WC, and modulates a bypass damper accordingly.
Two triac outputs (24 VAC, 300 mA) control the bypass actuator. The OPEN LED indicates
when the drive open actuator is energized, and the CLOSE LED indicates when the drive
close actuator is energized. The static pressure is measured by an electronic pressure sensor,
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SZEM Wiring Diagram
6
7
which is connected to the ductwork by means of a coiled 8' (2.4m) length of 1/8" (3.2mm)
PVC tubing. The length of the tubing provides protection from fluctuations in pressure and
temperature of air in the tube that may adversely affect the readings. Air feeds through the
tubing under pressure to the sensor.
CAUTION: DO NOT CUT OR SHORTEN THE PRESSURE SENSOR TUBING. IT
MAY BE LENGTHENED IF REQUIRED. USE 1/8" NONCOLLAPSIBLE TUBING.
The module will use the static pressure in the ductwork when all zones are open, fan is on,
and the bypass damper is closed as the nominal pressure of the system. Zone dampers opening and closing cause changes in pressure in the ductwork. The SZEM module will respond
to these changes by opening or closing the bypass damper to return the static pressure to
nominal.
PRESSURE PROBE INSTALLATION
Drill a 1/4"(4mm) hole into the ductwork close to the module, at a recommended distance of
3' to 6' (1m-1.8m) downstream from the bypass damper. Push the end of the tube with the
probe and fastener into the hole until the fastener touches the ductwork (Page 7 – Detail 8).
Secure the fastener using the #8 sheet metal screw provided with the probe. Connect the
opposite end of the tube to the upper nipple of the SZEM module’s pressure sensor (Page 6 –
Detail 1).
BYPASS DAMPER INSTALLATION
The bypass damper must be installed in the main supply plenum in a straight section of equal
duct size. The bypass air may be discharged into the return air plenum or above the ceiling if
this area is used as a common return.
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BYPASS SYSTEM SETUP
NOTE: The bypass setup is done by the SZP control module. Refer to section 6 of the
SlimZone Premier Installation and Operation Manual “Start Up and Test” for the startup
sequence.
1. Ensure that all components in the bypass system have been properly installed.
2. At the SZP module, select the Bypass Setup menu.
NOTE: The SZP control module will automatically setup the bypass system. The equipment
for the zone dampers and bypass dampers will be activated accordingly during the
setup sequence. The duration of the setup is approximately 5 minutes.
3. Proceed with the setup. The SZP module will proceed with the following 7 steps:
NOTE: The duration of each setup is approximate. Step 3 may repeat several times; when
STEP DESCRIPTION DURATION
6 Time delay – equalize system 30 seconds
5 Self calibrate – 0 pressure 30 seconds
4 Wait state – Status calibration Instantaneous
3 Fan on – bypass closed, open dampers,
measure system pressure
90 seconds
2 Store operation pressure Instantaneous
1 Read data from module Instantaneous
0 Read data from module Instantaneous
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NOTE: The duration of each setup is approximate. Step 3 may repeat several times; when
this happens the time will reset and count down to zero again.
4. The SZP module will proceed to the environmental test menu to display the current status.
The bypass damper may be closed or opened by the user at this point to ensure it is operating properly.
5. Setup is complete.
HIGH/LOW LIMITS OPERATION AND INSTALLATION
OPERATION
The SZEM module measures the temperature of the discharged or conditioned air using a
temperature probe with a range of 22°F to 194°F (-6°C to 90°C). High and low temperature
limits are programmed by the user at the SZP control module, and are monitored by the
SZEM module. The module will signal the SZP module whenever the discharged air temperature exceeds one of the limits and will indicate which of these was tripped, either high
or low.
The SZP control module will respond to these errors by signaling the equipment to shut
down. If more than one stage of equipment is energized, the control module will downstage
the equipment, shutting down one stage at a time, at an approximate interval of five minutes.
Once the air being circulated by the fan cools down or heats up to conform to the proper setpoint, the control module will once again allow calls for heating or cooling to be processed.
10
TEMPERATURE PROBE INSTALLATION
Drill a 1/4" (4mm) hole into the ductwork at a recommended distance of 6" to 8" (15cm –
20cm) downstream from the coil, but before the bypass damper. Push the end of the wire
with the probe and fastener into the hole until the fastener touches the ductwork. Secure
using the two #8 sheet metal screws with anchors provided with the probe. Connect the
opposite end of the wires to the Duct 1 and Duct 2 terminals on the environmental module
(polarity is unimportant).
IMPORTANT!
If the SZEM module is to be installed without the duct temperature probe, set the low limit
setpoint down to a value of 21°F (-6°C) in order to ensure the low limit alarm will not be
triggered. The SZEM module will read a value of approximately 21°F (-6°C) when the duct
temperature probe is not connected.
OUTDOOR TEMPERATURE PROBE OPERATION AND INSTALLATION
OPERATION
The SZEM module measures the outdoor temperature using a temperature probe, with a
range of -55°F to 118°F (-48°C to 48°C). The module communicates this information to the
SZP control module via the communication link, which in turn makes this information available to the DSL-520P zone thermostats.
In the heat pump mode, the SZP control module uses the outdoor temperature to monitor
deviation from the maximum and minimum balance points. These balance points are programmed by the user at the SZP control module. An outside temperature that exceeds the
11
high balance point will cause the SZP control module to disable the auxiliary heat source,
and heating will be provided by the compressor only. An outside temperature that is below
the low balance point disables the compressor, and heating will be provided by the auxiliary
heat source only.
OUTDOOR TEMPERATURE PROBE INSTALLATION
Select a location for the outdoor probe that will provide accurate readings. Drill a hole to
feed the cable to the SZEM. Do not locate the probe where it will be influenced by sunlight.
The north side of the building or under the shadows of eaves are good locations. Avoid locations close to dryer vents or other sources of heat.
Mount the probe on the outside of the building using the screws and wall anchors provided
so that the tip is well away from the surface of the wall. The probe’s cable length is 8'
(2.4m); additional 2 conductor cable may be added to increase the length. Route the cable to
the SZEM module and connect the wires to the terminals marked ODT 1 and ODT 2 respectively (polarity is unimportant).
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WARRANTY
LIMITED TWO YEAR WARRANTY
The manufacturer warrants to the original purchaser that its product and component
parts will be free from defects in workmanship and materials for a period of two
years from the date of purchase. Your dealer will provide free replacement of your
thermostat upon proof of purchase.
EXCLUSIONS
This warranty does not apply in the event of misuse, abuse, or as a result of unauthorized alterations or repairs. The manufacturer will not be liable for any consequential damages including, without limitation, damages resulting from defects, loss
of use or misuse.
This equipment, if installed in strict accordance with the manufacturer’s instructions,
complies with the limits for a class B computing device pursuant to Subpart J of Part
15 of FCC rules.
13
110-907 97255
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