OMEGA-VSHP.F-IOM-1907
www.omega-heatpump.com
10
8. CONTROLS
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. Make changes if warranted
by site conditions. Below are the 6 settings:
Table 3: DIP Switch Settings
Heat Pump Thermostat
Set DIP #1 to the “ON” position for Heat Pump Thermo-
stat. Refer to the following table for connecting thermo-
stat to unit terminal blocks:
Table 4: Heat Pump Thermostat Connections
Heat/Cool Thermostat
Set DIP #1 set to the “OFF” position for conventional
HEAT/COOL Thermostat. Refer to the following wiring
table for connecting HEAT/COOL thermostats to unit
terminal blocks:
Table 5: Heat/Cool Thermostat Connections
Thermostat Cable
Unit comes with a 24 inch long standard 6-wire thermo-
stat cable. This cable is factory wired to TB1 and TB2
terminal blocks on the controller board. Wire other end
of pigtails to thermostat. A minimum 4-wire thermostat
cable is required for single speed thermostats. A field
supplied 7-wire thermostat cable is required if 3-speed
fan control is required from a 3-speed thermostat. See
Figure 24: Thermostat Wiring Detail.
Multi Fan Speed Thermostat
If connecting thermostats with 3 speed control at the
thermostat, DIP switch #6 (FanMode) should be set to
the “ON” position. This will ignore the position of the unit
mounted fan speed selector switch. Fan speed will be
controlled by thermostat. Connect thermostat fan speed
control wiring to the G1,G2, and G3 terminals as shown
below. Fan speed is determined by the G1,G2, and G3
signals from the thermostat:
G1 Signal = LOW fan speed enabled.
G2 Signal = MEDIUM fan speed enabled.
G3 Signal = HIGH fan speed enabled.
Single Speed Thermostat
If connecting thermostats with single speed control at
the thermostat set DIP switch #6 to the “OFF” position,
In this mode thermostat can be connected to any of the
G1,G2, and G3 terminals and a “Run Fan” request from
thermostat will energize the fan to a speed determined
by the position of the unit mounted 3-speed fan selector
switch:
L = LOW fan speed
M = MEDIUM fan speed
HI = HIGH fan speed
Fan Control with PSC Motors
Fan speed for units with PSC motors is set using each of
the built-in motor speeds and are selected by either set-
ting the fan speed using the unit mounted fan speed
selector switch or a thermostat with 3-speed fan control
capability. See electrical schematic in Figure 22.
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 preprogrammed speeds for Low, Me-
dium and High. See electrical schematic in Figure 23.
Whisper Mode (ECM Only)
Whisper mode runs fan a pre-determined low fan speed
for continuous air circulation. Field wire R1 and G1 with
DIP
DESCRIPTION
OFF
ON
1
Tstat Type
Heat/Cool Tstat
HeatPump Tstat
2
HP Type
Hybrid HP
Std Heat Pump
3
FlowType
Variable Flow
Constant Flow
4
Coax Valve
Coax Valve NO
Coax Valve NC
HeatCoil Valve NO
Heat Coil Valve NC
RV Energized to Heat
RV Energized to Cool
6
FanMode
Fan Auto
Fan Manual
NO = Normally Open and NC = Normall Closed
5
Reversing Valve
(RV)/ HeatCoil
DIP 1 (ON) = HeatPump Thermostat
TERMINAL
BLOCK
WIRE
DESCRIPTION
TB1 #4
R
24VAC – Line (R)
TB1 #3
G1
Fan Speed 1 - Low Speed
TB1 #2
G2
Fan Speed 2 - Medium Speed
TB1 #1
G3
Fan Speed 3 - High Speed
TB2 #3
Y
Call for Compressor
TB2 #2
O/B
Call for Reversing Valve
TB2 #1
C
Common
DIP 1 (OFF) = HEAT/COOL Thermostat
TERMINAL
BLOCK
WIRE
DESCRIPTION
TB1-4
R
24VAC – Line – (R)
TB1-3
G1
Fan Speed 1 - Low Speed
TB1-2
G2
Fan Speed 2 - Medium Speed
TB1-3
G3
Fan Speed 3 - High Speed
TB2-3
Y
Call for Cooling
TB2-2
O/B
Call for Heating
TB2-1
C
Common
