OMEGA-VSHYe.F-IOM-2108
10
8. CONTROLS
8.1 MICROPROCESSOR CONTROLLER
DIP Switch Settings
Controller DIP switch contains 6 switches for setting up
Thermostat, Fan, and System settings. Microprocessor
DIP settings are factory set based on order configura-
tion. Make changes if warranted by site conditions. Be-
low are the 6 settings:
DIP Switch Settings
Heat/Cool Thermostat
-
Requires Power to G (Fan)
Ensure thermostat provides 24V power to G (fan) termi-
nal during call for heating or cooling. When using HEAT/
COOL thermostat, DIP #1 is set to the
“
OFF
”
position.
See table below for thermostat connections to controller
terminal blocks:
Thermostat Cable
Unit comes with a 24 inch long standard 6
-
wire thermo-
stat cable. This cable is factory wired to R, G2, G3, Y,
O/B, C on the controller board terminal strip. Wire other
end of pigtails to thermostat harness. A minimum 4
-
wire
thermostat cable is required for single fan speed thermo-
stats that do not require a common wire connection. See
Thermostat Wiring Detail.
Whisper Mode
Whisper mode is factory enabled and runs main blower
fan at pre
-
determined low fan speed for continuous air
circulation. A jumper is factory installed between
‘
R
’
and
‘
G1
’
terminals on TB1 of control board to enable Whis-
per mode. With Whisper Mode DIP Switch #6 is set to
(ON) Auto. The manual fan speed switch is not used.
Single Fan Speed Thermostat
If connecting thermostats with single fan speed control
connect fan speed to either the G2, or G3 terminals:
G1 =
“
Whisper
”
Mode
G2 = MEDIUM fan speed
G3 = HIGH fan speed
(Do not wire thermostat fan to G1 terminal)
Multi Fan Speed Thermostat
Up to two fan speeds can be selected from a multi
-
speed thermostat. Connect two of the thermostat fan
speeds to the G2, and G3 terminals:
G1 =
“
Whisper
”
Mode
G2 = MEDIUM fan speed
G3 = HIGH fan speed
(Do not wire thermostat fan to G1 terminal)
Fan Control with EC Motors (ECM)
Low voltage PULSE WIDTH MODULATED (PWM) sig-
nal is utilized to control motor speed between 0 and
100% of full speed. The controller has been pro-
grammed to use 3 pre
-
programmed speeds for
“
Whisper
”
Mode, Medium and High. Inside electrical box
a label indicates the factory pre
-
programmed speed set-
tings.
8.2 SEQUENCE OF OPERATION
Call for Heating and Cooling
Demand call for Heating or Cooling are initiated at the
thermostat.
Cooling
When a call for COOLING is made, the auto shut
-
off
control valve (COAX Flow valve) will divert water flow
through coaxial heat exchanger. The compressor con-
tactor will then be energized so long as none of the fol-
lowing fault conditions are present:
•
High
-
Pressure Alarm
•
Low
-
Pressure Alarm
•
Condensate Over Flow Alarm (Optional)
•
Compressor Anti
-
Short Cycle 7 min. timer has not
expired
•
Entering Water Temperature exceeds limits.
•
Leaving Water Temperature exceeds limits.
DIP DESCRIPTION
OFF
ON
1
Tstat Type
Heat/Cool Tstat
Heat Pump Tstat
2
HP Type
Hybrid HP
3
FlowType
Variable Flow
4
Coax Valve
Coax Valve NC
5
HeatCoil
Heat Coil Valve NC
6
FanMode
Fan Auto
NO = Normally Open and NC = Normall Closed
DIP 1 (ON or OFF) = HEAT/COOL Thermostat
TERMINAL
BLOCK
WIRE
DESCRIPTION
TB1-4
R
24VAC – Line – (R)
TB1-3
G1
Whisper Mode
TB1-2
G2
Medium Speed Fan
TB1-3
G3
High Speed Fan
TB2-3
Y
Call for Cooling
TB2-2
O/B
"W" Call for Heating
TB2-1
C
Common (Optional)