FSI F-DI1.25VHP ECU Quick start guide

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FSI®1.25TonAC/HeatPumpUnit
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OperationalGuidefor
F‐DI1.25VHP
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Operation guide for the F-DI1.25VHP ECU / heat pump
There are no user serviceable parts within the ECU and the user should not
attempt to service the ECU in anyway.
• Failure to use a grounded electrical outlet could result in an electrocution
injury.
• Disconnect unit from electrical outlet before performing any service or
maintenance.
• A qualified service facility or technician should only carry out any service
that the ECU requires.
• The ECU has very high operating pressures, moving parts and high
electrical voltages and current that can do bodily injury or can kill an
untrained person, all warning labels should be read and complied with.
Basic setup
Position the ECU in the required location to allow for the supplied ducting to
be connected to the shelter and the installation of the power supply and
control cabling. There should be adequate clearance on all sides of the ECU
to allow for adequate airflow around the ECU to aid in proper operation, a
minimum of 2 feet on all sides should be maintained.
The ECU is best positioned on level even ground to allow for proper drainage
of condensation removed during the cooling cycle.

Install the ducting to and from the shelter and fasten with the integrated
clamps. Slide the ducting over the rings and pull the loose end of the cinch
strap to tighten it on the rings. The left upper duct is the outlet air from the
ECU, supply air to the shelter, and the right lower duct is the return air from
the shelter.
Air supply to
the shelter
Air return from
the shelter
Controller
cable
connection
The portable controller is located on the opposite side of the unit from the
Supply/Return ports. It is fasten to the unit with heavy duty industrial Velcro.
The controller can remain on the unit during operation or can be removed and
relocated in a more advantageous position. The controller cable is connected
to the ECU with watertight turn lock connectors. When connecting the
controller cable to both the ECU and Controller you may hear a click when it
locks in place.
The temperature sensing is done at the intake duct of the ECU so the
controller can be placed inside or outside depending on your final needs.
Powering up the ECU
The power supply should be a 100 to 125 volt single-phase supply. Do not
run ECU on any other power sources. The supply power should be
adequately grounded to avoid electrical shocks or the possibility of
electrocution.
For Normal operation, air conditioning and heating, the 1.25 Ton ECU
requires a minimum circuit capable of 30 amps. The ECU will draw less
power in the Normal operation during cooling (AC) but will draw more power
during heating operations as the ECU will operate both the heatpump with a
resistance heater for heating. If wired to a building supply a minimum 30 amp

circuit breaker for starting the compressor is required. The ECU will draw less
current when it is operating.
For cold weather operation, the ECU has two resistance heaters installed.
You will need to provide enough power to operate the heaters in cold
weather. The ECU will draw 28 amps at 115 volts. In climates were the
temperature falls below 10 degree F and the ECU heatpump is ineffective use
the heat selector switch located just above the controller cable connection on
the ECU to select resistance heat only (Cold weather R heat only) this will
transfer the Heatpump power to the second resistance heater. The first
resistance heater is controlled by the ECU’s operation and is transparent to
the user.
Turn on the power supply circuit breaker.
The ECU’s fan will immediately start to circulate the air within the shelter, but
no heating or cooling will be enabled until the controller is turned on.
Controller setting
The controller will self-test and then display the status of the temperature in
the shelter on the top line of the display. (All temperatures are in Fahrenheit)
Controller cable

The second line of the display is the set point. The set point is the
temperature that you are attempting to achieve inside your shelter.
Press the Higher or Lower arrows once and the display will show set point
and the temperature that is currently set.
To change the temperature press once for each degree change or hold the up
or down arrow to scroll and set your new temperature.
When you are finished adjusting the temperature, and no changes are made
for 2 seconds the new temperature setting will lock in and the display will
revert to the normal standard display.
Press and hold the on/off button for 2 seconds. An asterisk will show in the
display to signify that the controller is now ON. While the asterisk is displayed
the controller is actively operating the ECU compressor and/or optional
electric resistance heat.
Any adjustments to temperature setting can be done while the controller is
operating. Simply change the temperature setting by pressing the Higher or
Lower arrow buttons. Once the desired temperature is shown on the
controller it will be accepted as the new setting.
The controller will start to control the shelter temperature by cycling the ECU
thru its heating and cooling modes to maintain the desired setting regardless
of whether it needs to heat or cool. The controller is designed to try and
maintain the temperature within 2 degrees of the set point chosen without
having to switch between heating or cooling modes.
Setting Fan Speed
The ECU is equipped with a two-speed fan. The ECU always starts at LOW
fan speed and can be switched to a high fan speed by the UP/DOWN arrow

buttons. Press and hold the DOWN arrow button then press the UP arrow
button. The display will switch to FAN SPD and display HIGH. As soon as the
display reverts to normal operation the fan speed will change to HIGH. To
switch back to LOW fan speed press and hold the UP button and then press
the DOWN arrow the display will switch to FAN SPD LOW and as soon as the
display reverts to normal operation the fan will switch back to the LOW speed.
Basic operation of the ECU
Initially pressing the on/off key on the controller, the ECU will start heating
with resistance heat or cooling 5 minutes after power is applied to it and the
asterisk appearing on the display.
On subsequent restarts there is a (5) five-minute delay built into the operating
program to allow the unit to equalize refrigerant pressures before it restarts
again. This is normal operation. This is not adjustable and is a mandatory
period required between cycles to insure that the internal pressures can
equalize before the ECU attempts to start.
The ECU will cycle on and off to maintain the set temperature. During startup
in a warm humid condition it may require a significant amount of time for the
ECU to reach the desired temperature. The ECU will dehumidify the space
first, and then lower the temperature second.
The ECU during it’s heating mode at certain outside temperatures will
develop frost and ice on the outside coils. In order to maintain the optimum
conditions for heating the ECU will automatically go into a defrost mode to
clear the coils. The resistance heater will continue to operate during the
defrost mode. Although the heatpump will not be supplying heat for a short
time and the return air will feel cool to the inside occupants, this is normal and
will only last a short time. Dependant on outside temperatures and conditions
the defrost control is automatically controlled by the freeze sensor located on
the condenser coils and no user intervention is required. This is normal
operation and immediately upon the defrost of the condenser coils the unit will
again go back to normal heating mode and start to supply heat pump heat to
the shelter.
Heating options for ECU Switch position
Normal Operation Cold Weather
AC & Heating R Heat Only
In extreme cold conditions the heatpump will become ineffective in heating
the shelter, the user should then select the cold weather R heat only setting.

Generally the outside temperatures would be below 15 degree F or –9 C This
will operate both resistance heaters instead of the heatpump and will be more
effective at supplying heat for the shelter.
The supply fan is constantly ON to allow a better air mix of heating and
cooling to help avoid uneven cooling or heating of the shelter when the
compressor unit cycles off. The fan is preset to always start in low mode and
can be switched to high by the user on the controller. In cold weather
operation, the fans lower speed using the resistance heaters will be slightly
more effective in heating.
Emergency operation mode
The ECU can be manually operated in the case of a controller failure, loss, if
the control cable gets damaged or an internal relay becomes inoperable.
The emergency bypass should only be used when there is an issue that
cannot be resolved and heating or cooling is mandatory.
Care should be taken not to switch between heating and cooling or on and
off without allowing at least a (3) three minute shutdown between cycles to
allow the compressor to equalize or you could damage the system.
Controller cable
connection
Emergency
Bypass Switch
Emergency Cooling
ON
OFF Normal Position
Emergency Heating
ON
Emergency
operate switch
When operating in emergency mode there is no temperature control so the
unit will have to be manually operated to maintain thermal comfort in the
shelter.

Shut down procedure
Turn the controller to the off position. Press and hold the ON/OFF button unit
the asterisk disappears, or simply unplug it from the control cable.
If the ECU compressor was running it will stop. The ECU fan will continue to
circulate air until it is turned of at the power supply breaker. This is normal
operation.
Turn off the power supply breaker.
Remove the plug from the power source.
Remove the ducting and controller cable from the ECU.
Clean and store the ducting, controller and ECU unit.
Storage of the ECU is best in a clean dry location.

NOTES:
1.25VHP
Wiring Rev 1A
Date 04-06-11
Identified Terminal
Emergency cool switch UP
Center position OFF
Emergency Heat switch Down
Controller no jumper
Compressor and Reversing
valve energized for heat
Fan speed
Relay 24 volt
Fan indoor
su
pp
l
y
Low
RED
Fan Capacitor
2
5
7
Transformer
24 volt AC
Compressor
relay 24 volt
RVR 24 volt
115 volt
30 A
Field
rece
p
tacle
Fuse 2 Amp
2
5
7
Run
Capacitor
Start
Capacitor
P
T
C
R
YEL
YEL
RED
WHT
RED
BLK
BLK RVS
HPS
WHT
BLK RED
BLKD
PUR
BLK
RED
WHT
High
BLK
Rear of
Interface
connector to
controller
WHT
RED
ORG
BLK
BLK
RESISTANCE
HEAT
LIMIT
SWITCH
2
5
7
24v S
Therm
Therm
24v R
NU
Fan
Comp
Rev V
Yel BLK
BLK
YEL
YEL
WHT
BLK
Emergency heat
and cool switch
PUR
BLU
BLK
HPC
LPC
C
THR
RV Y
Out
RB CYD
OCT
OAT
FAN
FAN
THR
CC
RED
Yel
RED
RED
2
5
7
BLK
PUR
BLK
PUR
Resistance
heat relay
24 volt
C
O
M
L
O
W
H
I
G
H
Fan
Capacitor
FAN
MOTOR
BRN
WHT
BRN
Defrost timer board
2
5
7
HPS relay
ORG
RED
R
S
Comp &
Overload
C
Select switch
res heat or
heat
p
um
p
PUR

R power
B power common
Y Fan
O cool
B rev valve
G Temp Ther
Not used
W Temp THer
A
24v S
Bl
ac
k
F Therm
G
r
ee
n H Therm
Whit
e
G 24v R
R
ed
B NU
E Fan
Y
e
ll
o
w
D Comp
O
r
a
n
ge
C Rev V
Bl
ue
A
24v S
Bl
ac
k
F Therm
G
r
ee
n
H Therm
Whi
te
G 24v R
R
ed
B NU
E Fan
Yellow
D Comp
O
r
a
n
ge
C Rev V
Blue
Controller cable receptacle and controller interface connector
Controller
Controller cable Wiring details
Viewed from the rear of the plugs
A
24v S
Bl
ac
k
F Therm
G
r
ee
n
H Therm
Whit
e
G 24v R
R
ed
B NU
E Fan
Y
e
ll
o
w
D Comp
O
r
a
n
ge
C Rev V
Bl
ue
Wiring details viewed from the rear of the receptacle

Trouble shooting
Check power supply
Check power cord
Check receptacle for damage
Verify that the controller is plugged in and
operational.
Check that the Asterisk is showing on the
display if not press and hold the on key for 2
seconds if that fails to work contact your
service personal.
Check that the controller power cord is
connected and that the ends are locked
Check that the controller cable and ends are
not damaged
If available try a second controller or cable to
determine if the ECU or the controller is at
issue
If the second controller fails to operate check
the fuse located behind the upper door in the
ECU replace with the same size fuse 2 amp
32 volts
If the airflow to the condenser section is
blocked or obstructed by dirt the unit can shut
down due to over pressure, disconnect the
supply cord and allow the unit to cool for
several minutes, clean or unblock the
condenser and retry the ECU
This is normal during cooler weather the ECU
will switch to resistance heat, as the
condenser thaws it will switch back to heat
pump mode
When the condenser freezes the ECU
switches to resistance heat only, the
resistance heat is nominal due to running at
120 volts this is normal, you may want to
augment your heating with an additional heat
source
ECU not operational
Inside blower operates but ECU will
not start to cool or heat
No display on the controller
If the ECU is operating and suddenly
shuts down but the internal blower
continues to operate
Condenser coils frozen up
Very cold weather, the ECU does not
seem to be supplying much heat