OMEGA-VSHPe.F-IOM-1912
www.omega-heatpump.com
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. Make changes if warranted
by site conditions. Below are the 6 settings:
Table 3: DIP Switch Settings
Heat Pump Thermostat
When using Heat Pump Thermostat (recommended
setting) set DIP #1 to the
“
ON
”
position. See table below
for connecting thermostat to unit terminal blocks:
Table 4: Heat Pump Thermostat Connections
When setting thermostat to HEAT PUMP mode check
the following:
“
G
”
Terminal Close (24V) = call for fan
“
Y
”
Terminal Closed (24V) = call for compressor
Heating Mode:
“
O/B
”
Terminal Open (0V) = Reversing
Valve De
-
Energized
Cooling Mode:
“
O/B
”
Terminal Closed (24V) = Reversing
Valve Energized
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 set DIP #1 set to the
“
OFF
”
position.
See table below for connecting thermostat to unit termi-
nal blocks:
Table 5: Heat/Cool Thermostat Connections
When setting thermostat to 1HEAT/1COOL mode check
the following:
“
G
”
Terminal Close (24V) = call for fan
Heating Mode:
“
O/B
”
Terminal Closed (24V) = Reversing
Valve De
-
Energized
Cooling Mode:
“
Y
”
Terminal Closed (24V)= Reversing
Valve Energized
Note: If both
“
Y
”
and
“
O
”
are closed, a call for HEATING
is assumed.
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 or wire
-
nut field provide thermo-
stat pigtails. A minimum 4
-
wire thermostat cable is re-
quired for single fan speed thermostats that do not re-
quire a common wire connection. 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 multi
-
fan speed thermostats, DIP switch #6
(FanMode) should be set to the
“
ON
”
position. This will
ignore the position of the unit mounted fan speed selec-
tor 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 ther-
mostat:
G1 = LOW fan speed
G2 = MEDIUM fan speed
G3 = HIGH fan speed
Single Fan 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. The fan speed will be deter-
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
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 Manual
Fan Auto
NO = Normally Open and NC = Normall Closed
5
Reversing Valve
(RV)/ HeatCoil