13
trouBlEshootInG
If the unit fails to operate check the following:
• Is the thermostat operating properly and is it on the proper
heat/cool temperature setting?
• Is the circuit breaker tripped? Also check for a blown fuse
in the air handler.
• Is the filter dirty or the return ductwork restricted?
• Did any wires from the compressor to the contactor, or
between the capacitor and contactor, work loose or get
damaged?
• Inspect the capacitor and make sure it is not damaged (by
lightning or a power surge) and is functioning.
• In a multiple earth loop system, check the temperatures
of the vapor and liquid lines. Measure and compare the
temperature of each vapor line. Separately measure and
compare the temperature of each liquid line.If there is a
difference, there could be a restriction in one of the wells.
• Check the system pressures. If very low, there may be a
refrigerant leak or the compressors internal overload is
open.
two Digit Display
This unit is equipped with a two digit display (shown in
) that communicates the status of the unit as well as current
and recent events. When power is applied to the unit a series
of 4 numbers are displayed separated by blinking “..”. These
numbers represent the firmware version.
When the unit is ready to run, it will display “- -” which indicates
that the unit is in standby mode. The display will alternate
between the current status and any current or recent events.
See
for status and event codes.
The display alternates between showing the current status
code and the 5 most recent event codes as shown in
. If an event code is flashing the conditions associated with
that event code are currently true. Each code is displayed
for 2 seconds with 1 second of flashing “..” between each
code. An example sequence is shown in
Filter
Gasket
Inlet
From Compressor
Outlet
To Reversing Valve
Nuts (x10)
Filter Nut
High Efficiency Filter
Clean-Up Filter
Pressure
Relief
Figure 2. Filter replacement
PrEssurE DroP
% oF FIltEr
loaDED
actIon
<5 psigD - 0.34 bar
50%
Change Filter
<7 psigD - 0.48 bar
60%
Change Filter
<10 psigD - 0.69 bar
70%
Change Filter
<12 psigD - 0.83 bar
75%
Change Filter
<15 psigD - 1.03 bar
80%
Change Filter
<20 to 25 psigD - 1.4 to 1.7 bar
85%
Change Filter
<30 to 40 psigD - 2.1 to 2.8 bar
90%
Filter o-ring could dislodge
<60 to 80 psigD - 4.1 to 5.5 bar
95%
Filter could rupture
table 6. Filter Pressure Drop
8
.
8
.
TEST
EXV VALVE
SUCTION PRESSURE
SUCTION TEMP
DISCHARGE PRESSURE
DISCHARGE TEMP
REVERSING VALVE
COMPRESSOR
POWER
WSV
HGIV
2 DIGIT DISPLAY
RV2
RV1
L2
Figure 3. control Board
