Installation and Maintenance Manual

ECM Overview and Setup
44 UV-SVN02C-EN
• The engine integrates a versatile configurable
auxiliary temperature sensor.
• The engine incorporates various safety and lockout
features, suc
h as maintaining proper fan speeds, if
electric heat is called for.
Standard Adapter Board
• The adapter allows direct customer interfacing
through the use of terminal strips. Standard
interfacing includes:
– Fan Speeds (H, M, L) (for w
all mounted fan speed
switches)
– Variable speed (0–10V) inputs
• The standard adapter board elim
inates many separate
wiring harnesses in the panel and allows simple,
mistake-proofed single-plug interfacing of:
– The ECM engine controller
–
Transformers
–Motors
– Valves
–Dampers
– Electric heat control
– Fan speed switches
– Main Power (except electric heat).
• Electric heat lockout circuits an
d fan proving circuits
for electric heat are standard, and are pre-configured at
the factory.
CSTI Adapter Board
• Performs all the functions of the standard adapter
module, but in addition, provides convenient field
connections to factory mounted end devices,
including:
– Valves
–D
ampers
– Electric Heat
• Performs courtesy “
inversion” of thermostatic inputs
to match selected valves:
– Standard thermostats put out only “on” signals,
however customer may select a normally open
valve. A selectable switch allows the customer to
invert the thermostat outputs for correct operation.
These switches are set at the factory, but can be
adjusted in the field.
– Sophisticated changeover function when used with
a thermistor, that replaces traditional bi-metallic
disc temperature switches:
• Board will automatically honor only the
appropriate customer request (Heat/Cool)
depending on sensed water temperature.
• Feature can be enabled or disabled with a
selector switch—however, it is set correctly at
the factory, based on customer choice of coil.
• The bi-metallic disc temperature switch
emulation is programmable, and dead-band
range can be adjusted.
• Electric heat lockout circuits and fan proving
circuits for electric heat are standard, and are
pre-configured at the factory.
Figure 41. Adapter board
Note: Customer Low-
Voltage
Interface for
Fan Speeds,
Variable Fan
Speed, and
24 Vac Supply
Figure 42. CSTI adapter board
1. Customer Low-Voltage Interface for Valves, Electric Heat, Dampers, Fan
Speeds, Variable Fan Speed, and 24 Vac Supply
2. Valve(s), Electric Heat, and Changeover Configuration Switches (Factory-
Set)
1
2
UV-SVN02_-EN.book Page 44 Thursday, January 24, 2013 4:48 PM