Specifications

Application Guide • BALTIC - 0108 • 9 •
FEATURES AND BENEFITS OPTIONS AND ACCESSORIES
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
ventilation 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 rooftop
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 inputs and 1 program-
mable 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
REFRIGERATION OPTIONS
LOW AMBIENT KIT
This option allows the Baltic to work in cooling mode with an
outside temperature down to 0°C (instead of 10°C in the standard
unit).Thisisspecicallyneededwhenfree-coolingoperationis
not possible.
LOW NOISE OPTION
As rooftop are often installed in a noise sensitive area, Lennox
propose a low noise option on Baltic. To achieve low noise level,
Baltic receive a higher diameter and lower speed fan as well as
acompressorjacket.
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eldassembled.
Adjustable Roofcurb
Galvanizedconstructionwithmountingange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proles.
Eachroofcurbhasitssupplyandreturnopeningsspecically
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 moun-
ting frames.
Multidirectional ow roofcurb
Made of the same material as the rooftop, it has a 10 years
warrantyagainstcorrosionanditisttedwithanges(*).
It is a necessary option when customer wants to have horizontal
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owconguration.
(*) see LENNOX corrosion policy.