Options And Accessories - Lennox BALTIC Series Application Manual

FEATURES AND BENEFITS
Inter unit link
Rooftop can now be connected together (up to 12) via a double
shielded pair of wire (not supplied by Lennox) and use different
running modes, as explained bellow, with no cost increase.
1 : Master slave mode "total" : The master gives the ven-
tilation order, its set point and its room temperature/humidity to
all other rooftops.
2 : Master slave mode "temperature": The master gives
the ventilation order and its room temperature/humidity to all
other rooftops, but they have their own set point.
3 : Master slave mode "average" : The master gives the
ventilation order and theroom temperature/humidity used by
all rooftop is the average of all rooftop, each rooftop has its own
set point.
4 : Master slave mode "cooling/heating" : All roofotp are
stand-alone but the slaves have to have the same running mode
as the master (Cooling or heating).
5 : Back-up mode : One rooftop is the back-up unit and
will operate if any of the other rooftop has a failure.
6 : Rolling Back-up mode : Same as above, except the
"back-up" unit will be different each tuesday.
On top of that, the outside temperature/humidity given to all
rooftop can either be the average of rooftop or be the external
humidity/temperature of the master, making possible the use of
a single "weather station" for the whole site.
Available dry contact (4 Output /2 Input)
As a standard features, an ON/OFF and a RESET Input dry
contacts are available as well as a GENERAL FAULT output.
On top of this, 2 programmable logical input and 1 programma-
ble logical ouput are available for the customer.
Input can, for example, be programmed to disable compressor
or electric heater or receive a running status from any devices
from the customer.
Ouput could be programmed to energize any customer device
or send different fault information.
OPTIONS
ROOFCURB AND AIRFLOW
Non adjustable, non assembled roofcurb
A sturdy mounting frame mates to the single package unit and
provides an automatic weatherproof sealed rooftop installation.
Shipped knocked down for ease of shipping and handling, it is
easily field assembled.
Adjustable Roofcurb

options and accessories

Aluzinc construction with mounting flange in 25/10° plate.
This adjustable roofcurb can be installed on a roof with up to 4-
5% slope in all directions enabling the BALTIC to be adapted to
most roof profiles.
Each roofcurb has its supply and return openings specifically
designed to ensure that resistance and hence pressure
drop through the curb is minimised.
This may allow a smaller supply fan to be selected due to the
fact that there may be less resistance through the unit and the
roof mounting frame, compared to more traditional roof
mounting frames.
Multidirectional flow roofcurb
Made of the same material as the rooftop, it has a 10 years
warranty against corrosion and it is fitted with flanges.
It is a necessary option when customer wants to have horizon-
tal return and horizontal supply on the same side of the rooftop.
It is also required with exhaust fan or gravity exhaust damper
combined with horizontal flow configuration.
Horizontal / vertical Air Flow
Lennox believes that rooftops should be adaptable to specific
design requirements, this is why a variety of downflow return
and supply, horizontal supply and return or a mix of both are
offered.
Drive Kit up to 500 Pa (400Pa on size 20, 25, 30 and 35)
As all systems are different, it is useful to have the ability
to adapt to different air flow conditions and this can be achieved
through the selection of various choices of motors and drives
that can provide up to 500Pa at nominal air flow. This means
that commissioning on site can be done easily and quickly,
helping you to keep your installation costs to a minimum.
Air Sock Control
The use of air socks for space conditioning allows high air volu-
mes to be distributed at low velocity and is becoming a common
feature in many applications. To accommodate this trend ,
Airsock control is offered which allows the air socks to be
progressively filled with air on start up. BALTIC has been
enhanced with an electronic device to soft start the fan. It takes
1 minute to go from 0% of air to full air flow.
Page 7 - Application Guide 04-2003 / Rooftop BALTIC Series - Page 7