DSC HS-EMS300 Installation Instructions & Owner's Manual
HS-EMS300
2 Heat/2 Cool Multi-Stage Thermostat
Installation Instructions
Introduction
The HS-EMS300 is a 2 Heat / 2 Cool / Plenum Fan Switch Electronic Digital
Communicating Non-programmable Thermostat designed for control of
standard multi-stage heating/cooling systems. It features an easy-to-read vertical LCD that displays the current temperature and complete operation status. A direct wire, easy-to-install backplate mounts on a standard vertical
outlet box or any drywall surface using the anchors and hardware provided.
This thermostat is designed to accept up to 6 indoor remote temperature sensors (HS-EMS-ITS) or 5 indoor and 1 outdoor (HS-EMS-OTS) remote temperature sensors. When indoor sensors are connected to the thermostat, the
temperature sensor (thermistor) on the thermostat is disabled. For temperature averaging at least two HS-EMS-ITS indoor remote sensors are required.
For additional information and wiring diagram for remote temperature sensors, refer to the Installation Instructions included with the sensors.
The HS-EMS300 connects to an Escort/VPM5580TC, allowing the user to
change temperature settings through premise or remote touch tone telephones. The Escort/VPM5580TC can announce the indoor temperature and
if an HS-EMS-OTS is connected, the outdoor temperature as well. Compatible LCD keypads can also display the temperature and allow the user to
access the temperature controls (requires LCD5500 v2.1 or higher).
For information on thermostat access and control using the Escort/
VPM5580TC, please refer to the Installation Instructions included with the
Escort/VPM.
Location
For accurate temperature detection, the thermostat should be mounted on an
inside wall, 46 cm (18”) from any outside wall, in a frequently occupied area
with freely circulating air. It should be approximately 1.5 m (5’) above the
floor. Avoid direct sunlight, radiant heat from appliances, air conditioner
grills, stairwells, water pipes, warm air stacks, and sources of electrical interference such as arcing relay contacts.
Pre-Wiring
The HS-EMS300 requires a 7 conductor wire when connected to a multistage heating and cooling system plus an additional 3 conductor wire when
connected to a security system through an Escort or VPM module.
Installation
1. Remove the thermostat cover. Insert a flat blade screwdriver, approximately 3 mm (1/8”) into the slot located in the bottom center of the
case. Twist ¼ turn to pop the thermostat loose from the backplate.
2. Swing the thermostat out from the bottom (hinge at top) and lift the
thermostat up and off the backplate.
3. Place the backplate opening over the control wires protruding from the
wall. Use the backplate to mark the location of two mounting holes.
4. Drill two 5 mm (3/16”) mounting holes at the marked locations. Tap the
supplied nylon anchors flush to the wall and fasten the backplate using
the supplied screws. Do not over tighten.
5. Connect the control wires to the thermostat as shown in the appropriate
wiring diagram. Push any slack wire back into wall. Ensure that the
wires are flush with the backplate. Seal the access hole to prevent
drafts from affecting thermostat performance.
6. Install optional setback and indoor/outdoor remote sensors, if used.
7. Replace the thermostat by inserting the tabs into the hinge slots at the
top of the backplate. Gently swing the thermostat downward and snap
it into place.
8. Replace the thermostat cover.
Thermistor Position
When placing the front cover on the thermostat, ensure that the thermistor is
not touching the case. The thermistor should be placed horizontal to the wall
and visible between the ribs of the case.
Thermostat Cover Lock
Insert the plastic lock piece into the bottom of the mounted base. The ends of
the lock piece fit snugly under the lock pins extending from the bottom of the
mounted base. The tab in the middle of the lock piece extends down from the
base.
To release the locking mechanism, press the lock piece up and into the base
while gently prying open.
DIP Switch Settings and Functions
The DIP switches are located on the interior of the thermostat and can be set
in either the ON or OFF positions depending on the installation. The default
positions are indicated in bold.
DIP Switch DIP Switch OFF DIP Switch ON
1 4 Minute Min ON 2 Minute Min ON
2 Keypad Unlock Keypad Lock
3 Fan ON with Heat Call Fan ON with plenum switch
4 Single Stage Multi-stage
5 LED 1 + No Icon LED 1 + Filter Icon
6 LED 2 + No Icon LED 2 + Fault Icon
1. 2 Minute or 4 Minute ON Times This option allows you to select
either a 2 or 4 minute minimum off and on time.
2. Keypad Lock In the ON position, all buttons are locked out except the
OUTDOOR Temperature button.
3. Plenum Fan Switch In the OFF position, the fan comes on immedi-
ately with a call for heat. In the ON position, the fan is controlled by
the equipment (plenum switch control).
4. Single or Multi-Stage This option allows you to select up to two stages
of heating and cooling.
5. LED 1 + Indication In the OFF position, LED 1 will light when the ter-
minal is energized. In the ON position, LED 1 will light and a Filter
icon will be displayed on the LCD when the terminal is energized.
6. LED 2 + Indication In the OFF position, LED 1 will light when the ter-
minal is energized. In the ON position, LED 2 will light and a Fault
icon will be displayed on the LCD when the terminal is energized.
Specifications
Rated Voltage........................................................................... 20-30 VAC, 24 VAC nominal
Rated AC...................................... 0.05-0.75 A continuous/output (surges to 3.00 A, max.)
Rated DC @ ‘R’ ..........................0.00-0.75 A continuous/output (surges to 3.00 A, max.)
Control range: Heating .............................5-30°C in (1° steps); or 38-88°F (in 1° steps)
Cooling......................... 16-40°C in (1° steps); or 60-108°F (in 1° steps)
Measurement range.............................................................................. 0-48°C; or 28-124°F
ODT Measurement range ..............................................................–40-48°C; or –40-124°F
Control accuracy..............................................................±0.5°C, at 20°C; or ±1°F, at 68°F
Minimum deadband.......................................... (between heating and cooling) 1°C; or 2°F
NOTE: This thermostat contains electronic circuitry that replaces the
conventional mechanical anticipator.
Fig. 1 Wiring Diagram for One Heating/Cooling System with One HS-EMS300 Thermostat
Free Light / LED1Free Light / LED2
R/24V shunt. Remove if
thermostat power is not
supplied by equipment.
Y2
W1
Y1
G
R
24V
24V(c)
W2
Thermistor Temperature Sensor
HS-EMS300
DIP SW6
DIP SW5
Display
LED1
LED2
CLK1
CLK2
RS2
RS1
RS+V
X1
X2
Escort5580TC/
VPM5580TC
X
2
X
1
RS+V
LED1
LED2
CLK1
CLK2
RS2
RS1
RS+V
X
2
X
1
HS-EMS300
(Backplate)
Y2
W1
Y1
G
R
24V
24V(c)
W2
Warning! Do not remove the internal jumper (shunt).
Cool Stage #2
Heat Stage #1
Cool Stage #1
Fan
Power - Hot
Power - Common
Heat Stage #2
Heating/Cooling
System
Y2
W1
Y1
G
24V
24V(c)
W2
Output Terminal Functions
LED1................. Free light for status or function indication.
LED2................. Free light for status or function indication.
CLK1................. Use with dry contact relay for alternate set points.
CLK2................. Use with dry contact relay for alternate set points.
RS2.................... To Outdoor/Indoor remote sensors.
RS1.................... To Outdoor/Indoor remote sensors.
RS+V................. To Outdoor/Indoor remote sensors and
to Escort5580TC/VPM5580TC.
Y2 ...................... Energizes on a call for second stage cooling.
W1 ..................... Energizes on a call for first stage heating.
Y1 ...................... Energizes on a call for first stage cooling.
G ........................ Fan is energized with a call for heating or cooling or by press-
ing the fan button.
R ........................Independent switching voltage.
24V .................... 24 V
C) ............... 24 VAC Common from equipment transformer.
24V(
AC Hot from equipment transformer.
W2 ..................... Energizes on a call for second stage heating.
X2...................... To Escort5580TC/VPM5580TC.
X1...................... To Escort5580TC/VPM5580TC.
Fig 2. Powering an HS-EMS300 Thermostat with a Stand-alone Transformer
Escort5580TC/
VPM5580TC
X
2
X
1
RS+V
LED1
LED2
CLK1
CLK2
RS2
RS1
RS+V
X
2
X
1
HS-EMS300
(Backplate)
24V(c)
Y2
W1
Y1
G
R
24V
W2
Cool Stage #2
Heat Stage #1
Cool Stage #1
Fan
Heat Stage #2
Heating/Cooling
System
Y2
W1
Y1
G
24V
24V(c)
W2
Common
Hot
24V
Transformer
Line Voltage
AC
Warning! Remove the internal jumper (shunt) before connecting the stand-alone transformer.
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