SSA-SVX06H-EN
33
Startup
Heating and Cooling Setpoint
Arbitration
All control function setpoints are set through one of the
Symbio™ 700 user interfaces. If no changes are made,
the controller will operate, as configured, based on the
default settings. Refer to the Symbio 700 Controller
with Odyssey Split Systems Application Guide for
details about which setpoints are required per
application.
Constant Volume Units
(Unit model number digit 15 = "1")
Unit is shipped for nominal airflow with nominal static
pressure. Please refer to the fan performance table in
the product catalog and select the proper drive package
for each application. Failure to do so could result in
improper airflow causing coil frosting or condensate
management problems. Condensate management
problems such as water blow off could be the result of
too great of air face velocity across the coil. To ensure
proper operation refer to
“Fan Belt Adjustment,” p. 44
.
SZVAV and Two Speed Air-
Handling Units with Symbio™
Condenser Units
The Symbio 700 controller provides integrated Supply
Fan speed setpoint control for paired air handler units
with VFDs for SZVAV and Two Speed fan operation.
These setpoints can be manipulated through the
Symbio 700 user interface (including the Symbio
Service and Installation app) or through a connected
BAS if required.
Figure 29.
Supply Fan speed setpoints
Each setpoint operates as described below.
S
Su
up
pp
plly
y F
Fa
an
n M
Ma
ax
xiim
mu
um
m S
Sp
pe
ee
ed
d S
Se
ettp
po
oiin
ntt ((R
Ra
an
ng
ge
e:: 6
67
7--
1
10
00
0%
%,, D
De
effa
au
ulltt:: 1
10
00
0%
%))
The Supply Fan Maximum Speed Setpoint correlates to
the maximum reference setting in the VFD (defaulted to
60Hz from the factory). With the Supply Fan Maximum
Speed Setpoint at its default value of 100%, and
parameter 6-15 in the VFD at its default value of 60Hz,
the maximum VFD output will be 60Hz. If the user
chooses to reduce the Supply Fan Maximum Speed
Setpoint, it will effectively reduce the maximum VFD
output from its configured value. See the example
below:
E
Ex
xa
am
mp
plle
e::