12
General Information (Continued)
Space Temperature Averaging
Space temperature averaging for Constant Volume applica-
tions is accomplished by wiring a number of remote sensors
in a series/parallel circuit.
The fewest number of sensors required to accomplish
space temperature averaging is four. Figure 8 illustrates a
single sensor circuit (Single Zone), four sensors wired in a
series/parallel circuit (Four Zone), nine sensors wired in a
series/parallel circuit (Nine Zone). Any number squared, is
the number of remote sensors required.
Wiring termination will depend on the type of remote panel
or control configuration for the system. Refer to the wiring
diagrams that shipped with the unit.
Space Temperature Averaging with Multiple Sensors
Unit Control Modules (UCM)
Unit control modules are microelectronic circuit boards de-
signed to perform specific unit functions. These modules
through Proportional/Integral control algorithms provide the
best possible comfort level for the customer. They are
mounted in the control panel and are factory wired to their
respective internal components. They receive and interpret
information from other unit modules, sensors, remote pan-
els, and customer binary contacts to satisfy the applicable
request for economizing, mechanical cooling, heating, and
ventilation. Figure 9 below illustrates the typical location of
each "1U" designated module.
Control Module Locations for S_HF 20 & 25 Ton Units
RTM
1U48
J1-1
J2-1
SCM
1U49
Bracke
t
Heat MOD
1U50
Mounting
Plate
LCI MOD
1U54
TCI MOD
1U54
Bracke
t
J2-1
J1-1
OR
1PCB MOD
1U55
ECEM
1U52
VOM
1U53
GBAS MOD
1U51
J1-1
J2-1
1TB9
J2-1
J1-1
J2-1
J1-1
J2-1
J1-1
J1-1
J2-1
Bracke
t
Bracke
t
Bracke
t
Bracke
t
Mounting
Plate
Mounting
Plate
Control Module Locations for S_HF 30 Ton Units
RTM
1U48
J1-1
J2-1
SCM
1U49
GBAS MOD
1U51
J2-1
J1-1
Bracke
t
Bracke
t
Bracke
t
Bracke
t
Bracke
t
Bracke
t
VOM
1U53
Mounting
Plate
J1-1
J2-1
Heat MOD
1U50
Mounting
Plate
LCI MOD
1U54
TCI MOD
1U54
OR
1PCB MOD
1U55
ECEM
1U52
J1-1
1TB9
J2-1
J1-1
J2-1
J1-1
J1-1
J2-1
J2-1
