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4.2
THERMOSTAT INSTALLATION: DSL-520P
LOCATION
The most important consideration in installing your DSL-520P Communicating Zone thermostat
is where to locate the unit. The location can radically affect the operation of the thermostat.
To ensure proper operation, the thermostat should be mounted on an inside wall in a frequently
occupied area of the zone. In addition, its position must be at least 18 inches (46cm) from any
outside wall, and approximately 5 feet (1.5m) above the floor in a location with freely circulating
air of an average temperature. The control module has four (4) terminals at each zone terminal
strip for connecting the thermostat.
CAUTION: Ensure that the following polarity is respected (refer to Figure 4.2):
Refer to the manual provided with the DSL-520P thermostat for detailed instructions.
4.3
DAMPERS
Typical dampers are designed to work with low pressure systems (1.0" WC or less). Balancing
dampers should be installed ahead of all zone dampers. Zone dampers should be installed
10ft. (3m) back from discharge grille. A flex or lined duct is recommended for the last 5ft.
(1.5m). Enerstat dampers are nonmodulating dampers. Two (2) wire dampers are powered
closed and spring return open. Three (3) wire dampers are powered closed and powered open.
For applications requiring minimum air ventilation, an adjustment screw is available to set the
damper to a specified minimum open position. Enerstat dampers are shipped from the factory
with the minimum position adjustment screw in the fully closed position; allow for a 3% to 5%
leakage with damper closed. The control module has five (5) terminals at each zone terminal
strip for damper connections which are as follows (refer to Figure 4.2):
24L:
PC:
PO:
Power to the dampers is provided by the 24L and 24N terminals at each zone terminal strip.
Refer to section 3.4 for information on sizing transformers.
High ambient temperatures that may be encountered (in an attic for instance), will have an
impact on the current capabilities of the panel and the number of zone dampers that can be
connected to the panel. The SZP is powered by a single 75VA transformer. This transformer is
used to power the panel and thermostats. The ambient temperature will have an impact on the
polyfuse current limiting protection. The maximum number of dampers that can be connected
per zone using Enerstat dampers are:
If additional dampers are required you must use a relay to energize these additional
dampers from an independent source.
SlimZone Premier
DSL-520P.......SZP
1 ..................... 1
2 ..................... 2
3 ..................... 3
4 ..................... 4
24VAC transformer,
power damper closed
power damper opened
At 25°C (77°F)
5 E Series dampers
4 E2 Series dampers
5 E3 Series dampers
24N:
24VAC transformer common
24N:
common
At 40°C (104°F)
4 E Series dampers
3 E2 Series dampers
4 E3 Series dampers
7
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