ClimateMaster AG series Troubleshooting guide

Tranquility® Digital (DXM2)
Troubleshooting Guide
Residential Packaged
DIGITAL Geothermal
Heat Pumps
97B0601N01
Rev.: 4/3/14
Table of Contents
Introduction
Troubleshooting Flow Chart
Flow Chart Reference Symbols and Diagrams
Contactor Chart
Verifying Pump Feedback Signal
Removing Powerhead on Modulating Valve
Checking Compressors
Reversing Valve Touch Test Chart
Performance Troubleshooting
Functional Troubleshooting
Commissioning Worksheet:
Typical Water Source Refrigeration Circuit
(Heating Cycle)
Basic Refrigeration Summary
Refrigeration Troubleshooting
Auxiliary Heat Check
Checking Pump Output
Compressor Contactor Voltage Check
Check CCH for 24 Volts
Verifying Contactor
Verifying Capacitor
Checking Pump Power Cord
Replacing Variable-Speed Pump Power Head
Verifying Power at Molded Plug
for Compressor
Verifying Antifreeze
Second Stage Verification
2
3-9
10
11
11
12-13
14-15
16
17-18
19-21
22-23
24
25
26-27
28
28
29
29
29
30
30
31
31
32
33
Verifying 24V at Reversing Valve
Checking Reversing Valve at DXM2
A0-2 Jumper
Checking for Power at DXM2
Verifying DC Voltage on DXM2 Board
for Modulating Valve Check
TXV Bulb Test
Verifying Dipswitch Position
Replacing High Pressure Water Switch
Verifying a Thermistor
Turning Breaker on in Panel
or Aux Heat Control
Static Pressure Check
Locating Tstat Version and DXM2 Version
UltraCheck EZ™ Motor Diagnostic Tool
Checking Dipswitches on DXM2
Magnet Test to Shift Reversing Valve
Checking Blower Line Voltage
Modulating Valve Loses Configuration
Hard Reset of Thermostat
Units Having LT1 Lockouts In Heating
Definitions of Conditions
DXM2 Board Layout and Dipswitches
DXM2 Controls
Wiring Diagrams
ATC Thermostat Screens and Set Up
Revision History
34
34
35
35
36
37
38
38
39-40
41
41
42
42
43
43
44
44
45
46
47-48
49
50-53
54-55
56-62
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Introduction
Troubleshooting ClimateMaster Tranquility® Digital Packaged Heat Pumps is quite straightforward.
Most problems relate to water flow. Either there isn’t enough water flow or the entering water temperature is improperly
supplied. Most service problems can be addressed without refrigerant gauges. In fact, installing gauges on packaged heat
pumps can do more harm than good because packaged heat pumps contain less refrigerant compared to split systems.
The first thing to do is always perform a water side check (Heat of Extraction for Heating or Heat of Rejection for Cooling) to
determine if the unit is operating properly.
Set up and diagnostics are made easier using the communicating thermostat (ATC32) or the communicating service tool
(ACDU01). You must have ATC32 or ACDU01 to properly work on ClimateMaster Tranquility® Digital units that use the DXM2
control board.
Follow the flow chart on the following pages to help diagnose and solve your issue.
2
Geothermal Heat Pump Systems
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Troubleshooting Flow Chart
Did unit
start?
Check that unit
voltage reads:
197-254V
No
Yes
Does thermostat say Yes
‘No Communication’?
Is there power
to DXM2 24V?
(18-31.5V)
Establish power
A-Z
If it is still not
communicating,
check the
thermostat wire
(Be sure it is not
running parallel
along power
wire). Ensure all
wiring is landed
properly on
both DXM2 and
thermostat.
Disconnect and
reconnect the
wires from the
DXM2. This
will reset the
thermostat.
Also ensure there
are no wire nuts;
solder wires if
they need to be
extended.
Verify that
Dipswitch 1
on S3
is in ‘On’
position
A-W
Hard
reset the
thermostat
B-K
Is the unit
properly
configured?
See Section
3.0 on page
56.
B-G
Hook Service Tool up to
board. Does Service Tool
communicate with board?
The unit did
start but it
locked out
Yes
Verify that
the DXM2’s
dipswitches
are set
properly.
Check Fault Code
from thermostat
or service tool
No
Fault
No
Replace board if
current board still
does not function
Check that the
compressor is not in a
thermal overload
No
No
See Fault Codes
and Possible
Causes
A-F
Check that there
are 24 volts at CC on Yes
DXM2 board and a call
for heating or cooling
A-K
No
Replace the
DXM2 Board
Check for 24V at
contactor
18-31.5 volts
A-M
Yes
A-A
No
Check and possibly
replace wiring
Next Page
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Troubleshooting Flow Chart
Continued
Replace
DXM2 board
No
Check that the
The unit starts Yes Is there voltage Yes
A0-2 jumper on Yes
but the pump
to the pump?
DXM2 board is in
does not
(197-254V)
PWM position
A-O
A-V
Check DC Voltage
at DXM2 Board
No
A0-2-Ground = .5-10 VDC
Is voltage in this range?
Yes
Yes
Verify how the units are
configured in the thermostat
(refer to ‘Section 3.3 - Unit
Configuration’ on page 53).
Be sure unit is configured for
‘Variable Speed Pump Single’
if unit is on it’s own loop. If unit
shares a loop with other units,
then ensure that the unit is
configured for ‘Variable Speed
Pump Parallel.’
No
Does the low
voltage wiring
have a broken
wire?
Check DC Voltage
at DXM2 Board
Replace
wire harness
T1-Ground =
3-4 VDC
(Pump off)
0-2 VDC
(Pump on)
Is voltage in this range?
A-J
No
Replace pump
power head
A-P
My unit has
a Modulating
Valve. Is valve
opening?
Is the valve having
trouble shutting
completely and/or
is the unit
locking out?
No
Yes
Valve opens or
closes correctly
Verify
Valve and
powerhead
alignment
Check
Yes
Verify A0-2
jumper is in
10V position.
A-V
What are the ∆T set points?
Control defaults are 7°
heating and 10° cooling.
Open loop units with EWT
less than 50° will need
to lower ∆T to 4-5° in the
heating mode.
B-L
Be sure unit
is configured
for Modulating
Valve.
See Section 3.2
on page 56.
Third notch aimed down in
unit position.
Then reattach powerhead.
A-C
Next Page
4
Manually open the valve
100%. Remove powerhead
from valve with powerhead
still energized. Then verify that
the notches on valve body are
in the correct position.
Geothermal Heat Pump Systems
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Troubleshooting Flow Chart
Continued
Verify that
the wiring on
the valve and
DXM2 Board
are correct.
See wiring
diagrams on
pages 53-54.
Verify that the DC voltage on DXM2
between A0-2 and GND. Voltage should
be between 3.3-10VDC. This is the output
from the board to the valve.
A-X
The unit uses
a modulating
valve but the
thermostat
continues
to show a
variablespeed pump.
Connect a piece of thermostat wire
between T1 and GND on DXM2 so the
DXM2 board sees no feedback.
B-J
Valve does
function but
when the unit
shuts off, the
valve remains
open.
Does blower
turn on?
Verify 3/4” Valve Dipswitch
or 1” Valve Dial
A-C
No
Yes
Verify in
configuration
that the unit
is configured
correctly for ECM
Is 197-254V at the
blower motor?
B-I
No
Check the wire
harness and
replace if needed
Yes
Check continuity on
communicating harness
from DXM2 to Module.
Is there a broken wire?
Yes
Replace wire
harness
No
Does the motor
try to spin
when giving a
‘G’ call?
No
Replace
defective part
Next Page
Use Emerson EZ
Tool to troubleshoot
motor and verify
motor or module
B-F
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Troubleshooting Flow Chart
Continued
Is the
blower loud?
Yes
Check your
model’s airflow
configuration.
See Section 3.1
on page 56.
Verify that
all grilles
and registers
are open.
Check static
pressure
B-D
No
There are
no faults,
but does the
compressor
start?
No
Yes
Verify comp contactor.
A-A
Verify capacitor. Turn off
power and allow 5 minutes
for discharge. Then verify
with volt meter the UF
reading compare to UF
reading on capacitor. Is
capacitor good?
A-N
Yes
No
Unit starts but Yes
does not shift
to cooling
No
No
Call for
cooling
Yes
A-Q
A-D
Check
reversing valve
connection at
DXM2. Do you
have 24 VAC?
Yes
Verify
24V at
reversing
valve
Replace compressor
Yes
A-U
No
No
Verify that
Dipswitch 1:4
is on
Replace
solenoid on
reversing valve
Yes
A-T
Replace
defective
wiring
If Dipswitch 1:4
is on, replace
board
In order to increase pressure
and move a reversing valve
that is sticking, place unit
in heating mode and then
remove blower door. Just after
removing door, energize the
valve. If it still doesn’t shift, try
a strong magnet to pull over
internal slide while energizing.
B-H
Verify RV
operation
Replace the reversing valve if
it still does not shift
Next Page
6
Turn power off and
remove molded plug on
compressor. Measure
resistance between C-S
and C-R.
Yes
Replace molded
plug and wire
harness
Replace capacitor.
Verify that
you have
cooling
call at
thermostat
Verify voltage to
compressor at
molded plug
Geothermal Heat Pump Systems
A-E
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Troubleshooting Flow Chart
Continued
Unit does
not seem to
be in second
stage. This is
indicated by the
performance
check being
about 30%
(low).
Yes
Verify that
you have
second
stage call
No
Verify whether
the thermostat
is configured
for multi-stage
operation
No
Yes
Does
DXM2
CCH have
24V?
A-L
Does the rectifier
plug on the side
of the compressor
have 15-27 VDC?
Yes
No
No
Replace the
rectifier plug
Yes
Verify that
Dipswitch
1:4 is on
If Dipswitch 1:4
is on, replace
board
With unit running in second
stage, check amp draw
of comp. Next, remove
rectifier plug. Amps should
be lower after removing
plug. Reattach plug and
verify that amps return to
previous higher reading.
A-S
No
Replace
compressor
The unit started
but runs and
loop temp
continue to drop
in the heating
mode
No
Yes
Verify the antifreeze
level where applicable.
Remember that EWT
below 45° needs 15°
freeze protection.
Verify with appropriate
hydrometer.
A-R
Yes
Antifreeze has
been verified
as having
15° freeze
protection.
Then cut the
JW3 jumper
Yes
Is there enough loop in
the ground? Is the loop
making good contact?
(Example: Is your
vertical loop grouted
from top to bottom?)
Yes
Is the loop turbulent?
Min 2500 Reynolds
Number.
Use Pressure Drop
Software to verify
Next Page
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Troubleshooting Flow Chart
Continued
The unit
periodically
locks out on LT1
in heating or
high pressure in
cooling
Yes
Is there more
than one unit
sharing a
common loop?
Does this unit
have a Variable
Speed Pump and
is it configured for
parallel pumping?
Yes
No
ATC Thermostat
Yes
says ‘ECM
Configuration
Error’
Properly configure
unit. See Section 3.3
and Section 3.4 on
page 57.
Is the thermostat
configured for the proper
model of the unit?
(Example: TZ036) This is
found on thermostat’s unit
configuration menu.
Yes
Does the unit have the
correct ECM Motor? Check
the ECM table, which is in
the unit’s IOM.Compare to
the motor in the unit.
No
No
Configure
The unit does
run but ATC
Thermostat
says ‘Service
Needed’
Yes
This is the Unit
Performance Sentinel. In
cooling mode if LT2 is 40°
or lower or LT1 is 125° or
greater. In heating mode if
LT2 is 125° or greater.
Go to Faults
Code 8.
A-F
No
Next Page
8
Verify pump is
supplying enough flow
using Pressure Drop
Software. Closed loop
2.25 - 3.0 gpm per ton.
No
See Lockout
Faults on page
51 under ‘Fault
Codes’
No
Yes
Geothermal Heat Pump Systems
No
Replace with
correct motor
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Troubleshooting Flow Chart
Continued
Unit runs but
does not satisfy
Verify the Water Side
Performance
Yes
HE =
HR =
No
Yes
Heat Extraction in
BTUs (Heating)
Heat Rejection in
BTUs (Cooling)
The unit is running.
However, there is
a load issue. The
home is losing or
gaining more than
the capacity of the
heat pump.
Calculate using the formula
found on A-G.
Check with performance
data. Is unit within 10%?
A-G
Yes
Verify load using a
manual J program.
You may also need to
perform a blower door
test for true infiltration
and thermal imaging
for locating heat loss.
Also consider a duct
blast to verify that
air is being delivered
properly.
No
If water flow and airflow are good,
then verify refrigerant charge.
Calculate superheat and subcooling.
A-H
Then check for proper TXV operation
before adding or removing charge.
Adjust charge if needed to proper
superheat and subcooling ranges.
A-Y
The unit runs
but auxiliary
heat is not
working
Yes
Is the thermostat
calling for
auxiliary heat or
emergency heat?
Yes
Does unit have
197-254V at
auxiliary heat
strip?
No
Verify that
configuration is set
to auxiliary heat in
thermostat. See
section 2.2.2 on
page 55.
Yes
Does DXM2
have 24 VDC
at EH1 and/or
EH2?
A-I
No
Turn breaker
on in panel or
in auxiliary heat
control
Yes
No
Replace
DXM2
B-C
Replace heat
strap board
Yes
Does the heat
strip control
board have the
same 24 VDC as
the DXM2?
No
Replace
wire harness
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Reference Symbols and Diagrams
for Flow Chart
10
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Contactor Chart
A-A
Motor does
not hum
Contactor
closed
Burned
contacts
Open in low
voltage circuit
Incorrect
wiring
Open motor
wiring
Open overload
switch
High discharge
pressure not
equalized
Low line
voltage
Burnt out or
open winding
Non-condensibles in
refrigerant circuit
Motor hums, cuts off
on overload circuit
breaker or blows
fuses
Compressor tight or
stuck
Check
contactor
Buzzing
Normal voltage
to coil
Low voltage
to coil
Contactor open
Contactor defective,
jammed or hung up
Wrong gauge of
thermostat wire
Low voltage from
transformer
Not buzzing
Loose
wire
No voltage
to coil
Voltage
to coil
No power
to control circuit
Coil open
circuited
Verifying Pump Feedback Signal
1 2 3 4
P11
Acc2
Relay
Acc1
Relay
COH
COM
R
COM
NC2
NO2
NC1
NO1
R
P3
A
H
ESD
OVR
COM
Factory Use
Alarm
Relay
C
AO1 Gnd AO2 Gnd
S1
Off
On
1 2 3 4 5 6 7 8
S3
On
Off
T1 T2 T2 T3
S2
A0-1 A0-
Off
Fault Status
U1
A-B
0-2 VDC with pump on
3-4 VDC with pump off
Ensure correct wiring on T1=Yellow,
A0-2=White. If not, voltage may look
good but pump may not operate.
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Removing Powerhead on ¾-Inch Modulating Valve
A-C
On 3/4” valve, be sure that dip switch
is moved up or toward center of
valve and valve closes.
For Proper Valve-to-Head Alignment
Before removing power head, go
to manual mode and open valve to
100%. Stay on that screen and with
the valve powered open, remove
power head. Verify or rotate physical
valve to the
position.
Open
Closed
12
Geothermal Heat Pump Systems
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Removing Powerhead on 1-Inch Modulating Valve
A-C
1)
Rotate dial to ‘1’ on the
1-Inch valve.
2)
The 1-inch valve includes
a tool to remove the
power head.
See previous page for
proper valve-to-head
alignment.
Open
Closed
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Checking Compressors
A-D
Compressor Ohms Table
Compressor
C-S
Ohms
C-R
Ohms
Unit
ZPS20
1.64
1.30
TZ024, TE026
ZPS30
1.52
0.88
TZ036, TE038
ZPS40
1.86
0.52
TZ048, TE049
ZPS51
1.68
0.41
TZ060, TE064
ZPS60
1.85
0.34
TE072
ZPS26
1.90
1.02
TZ030
ZPS35
1.55
0.62
TZ042
Note: Readings are good ± 7%
Note: Reading S-R = C-S + C-R Readings
Example: ZPS20 S-R = 2.94 Ohms
Compressor with Open Internal Overload
Overload opens
Compressor with Open Run Winding
C
C
If both R and S are open to
common, Internal overload
is open.
Open run winding (infinite)
resistance. Start winding shows
measurable resistance.
Compressor with Shorted Windings
Compressor Winding Shorted to Ground
C
S
Suction
Line
C
R
Note: If not, O resistance will
be close to it.
C-S and C-R will have high
resistance above 3 ohms.
14
R
S
R
S
S
R
Check for ground by placing
one lead on suction line.
Geothermal Heat Pump Systems
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An Alternative Way of Checking Compressors
A-D
Megohm Values of Copeland Compressors
For years servicemen have used megohmeters to evaluate
compressor motor windings. However, most megohmeter
manufacturers publish guidelines that apply to open motors.
For this reason, Emerson Climate Technologies has
investigated the use of megohmeters on hermetic and semihermetic compressors.
When using megohmeters to evaluate the motor insulation
of compressors, it is important to understand that they
should not be used as one would a volt-ohm meter. A single
megohmeter reading gives little insight into the condition of a
motor’s insulation.
Megohmeters are best used as a part of a regular
maintenance program to monitor trends (over several
months). For example, one might record a megohm value
and compare it to a previous reading. If subsequent readings
show a trend of lower and lower values, then corrective
action (such as system clean up) should be taken.
Emerson does not incorporate the megohmeter into any of
its quality checks. All Copeland® compressors must pass
U.L. required tests using hi-potential current leakage testers
(“hi-pot”). Studies performed by Emerson have found that
compressors with megohmeter readings as low as 0.5
megohms still pass the hi-pot.
Megohmmeter
There are many factors that affect megohm readings
including contaminated refrigerant, oil level, refrigerant in
oil and current leakage through electrical fusites or terminal
plates.
Any external electrical components connected to the
compressor terminals also affect megohm readings. Wires,
contactors and relays all leak current and will decrease
compressor megohmeter readings if not disconnected.
As mentioned earlier a single megohm reading cannot be
used to condemn a compressor since many other factors are
involved. However, limits can be placed on megohm values
that dictate action be taken. Emerson has found that these
limits are related to the rated voltage of the compressor.
Megohm values equal to or greater than 1000 ohms per volt
are probably acceptable. For example, a 460 volt compressor
might show a megohm reading of 460,000 ohms or 0.46
megohm. Compressors with rated voltages of 208 to 230
volts would then be operable at megohm values of 0.208 to
0.230 megohms; for simplicity, Emerson has set the limit at
0.5 megohms before a compressor is condemned. Figure 1
shows the required procedure for checking compressors with
a megohmeter.
New compressors that have never been installed will not
need any system clean-up procedures so long as the
megohm reading is above 0.5. A baseline reading must be
established for comparison purposes and since this is its fi rst
reading this will be its baseline value.
Figure 1
Megohmeter Test Procedure
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Reversing Valve Touch Test Chart
A-E
2
Suction Line
to Compressor
3
4
Line to
Air Coil
VALVE
OPERATING
CONDITION
Line to
Coax
NOTES: * Temperature of Valve Body
** Warmer than Valve Body
1
2
3
4
5
5
6
6
NORMAL OPERATION OF VALVE
Normal
COOLING
Hot
Cool
Cool
23 (2)
Hot
23 (7)
TVB
*TVB
Normal
HEATING
Hot
Cool
Hot
23 (1)
Cool
23 (2)
TVB
*TVB
Discharge from
Compressor
MALFUNCTION OF VALVE
Possible causes
Check electrical circuit and coil
Check refrigeration charge
Valve will not
shift from heat
to cool
Start to shift
but does not
complete
reversal
Apparent lock
in cooling
Will not shift
cool to heat
16
Hot
Cool
Hot
23 (1)
Cool
23 (2)
Hot
Repair electrical circuit
Defective coil (No resistance)
Replace coil
Low charge
Repair leak, recharge system
Pressure differential too high
Recheck system
Pilot valve okay. Dirt in one bleeder hose.
Deenergize solenoid, raise head pressure and reenergize
solenoid to break dirt loose. If unsuccessful, remove
valve and clean out. Check on air before installing if not
movement, reduce valve, add strainer to decharge tube and
mount valve horizontally
Platon cup leak
Stop unit. After pressure equalizes, restart with solenoid
energized. If valve shifts, restart with compressor running. If
still no shift, replace valve.
Clogged pipe tubes.
Raise head pressure, operate solenoid to free. If still no shift,
replace valve
Hot
Both parts of pilot open. (Back seat port did not
close)
Raise head pressure, operate solenoid to free partially
clogged port. If still no shift, replace valve.
Warm
TVB
Defective compressor
*TVB
Hot
Not enough pressure differential at start of
stroke or not enough flow to maintain pressure
differential.
Check unit for correct operating pressures and charge.
Raise head pressure. If no shift, use valve with smaller ports.
Body damage.
Replace valves.
Both parts of pilot open.
Raise head pressure, operate solenoid. If no shift, replace
valve.
Body damage.
Replace valve.
Valve hung up at mid-stroke. Pumping volume of
compressor not sufficient to maintain reversal.
Raise head pressure, operate solenoid. If no shift, use valve
with smaller ports.
Both parts of pilot open.
Raise head pressure. Operate solenoid. If no shift, replace
valve.
Pilot needle on end of side leaking.
Operate valve several times then recheck. If excessive leak,
replace valve.
Pilot needle and piston needle leaking
Operate valve several times then recheck. If excessive leak,
replace valve.
Pressure differential too high
Stop unit. Will reverse during equalization period. Recheck
system.
Clogged pilot tube
Raise head pressure. Operate solenoid to free dirt. If still no
shift, replace valve.
Dirt in bleeder hole
Raise head pressure. Operate solenoid. Replace valve.
Piston cup leak
Stop unit. After pressures equalize, restart with solenoid
deenergized. If valve shifts, reattempt with compressor
running. If it still will not reverse while running, replace valve.
Defective pilot.
Replace valve.
Cool
Hot
23 (1)
Cool
23 (2)
Hot
*TVB
Hot
Cool
Hot
23 (1)
Cool
23 (2)
Hot
Warm
Cool
Warm
23 (1)
Cool
23 (2)
Hot
Warm
Warm
Hot
Hot
Warm
Warm
Hot
Hot
Hot
Hot
Hot
Hot
Hot
*TVB
Hot
Hot
Hot
Hot
Hot
Hot
Hot
Hot
Cool
Cool
23 (2)
Hot
23 (1)
**WVB
*TVB
Hot
Cool
Cool
23 (2)
Hot
23 (1)
**WVB
**WVB
Hot
Cool
Cool
23 (2)
Hot
23 (1)
TVB
TVB
Cool
23 (2)
Hot
23 (1)
TVB
Hot
Cool
Corrections
No Voltage to coil
*TVB
Hot
Hot
1
Hot
Cool
Cool
23 (2)
Hot
25 (1)
Hot
Hot
Warm
Cool
Cool
23 (2)
Warm
25 (1)
*TVB
Warm
Defective compressor.
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Performance Troubleshooting
A-F
Symptom
Htg Clg Possible Cause
X
X
9K\JLKVYUVHPYÅV^
PUOLH[PUN
X
0UZ\MÄJPLU[*HWHJP[`
Not Cooling
or Heating Properly
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
:LL)+
*OLJRZ\WWS`HUKYL[\YUHPY[LTWLYH[\YLZH[[OL\UP[HUKH[
KPZ[HU[K\J[YLNPZ[LYZPMZPNUPÄJHU[S`KPMMLYLU[K\J[SLHRZ
HYLWYLZLU[/H]LHK\J[ISHZ[[LZ[WLYMVYTLK
*OLJRZ\WLYOLH[HUKZ\IJVVSPUNWLYJOHY[
*OLJRZ\WLYOLH[HUKZ\IJVVSPUNWLYJOHY[YLWSHJLPM
YLZ[YPJ[PVU)V[O:/HUK:*^PSSILOPNO
7LYMVYT9=[V\JO[LZ[
*OLJRSVJH[PVUHUKMVYHPYKYHM[ZILOPUKZ[H[
9LJOLJRSVHKZZPaPUNJOLJRZLUZPISLJSNSVHKHUKOLH[
W\TWJHWHJP[`
9LK\JLKVYUVHPYÅV^
PUJVVSPUN
X
X
3LHR`K\J[^VYR
X
X
X
X
3V^YLMYPNLYHU[JOHYNL
9LZ[YPJ[LKTL[LYPUNKL]PJL
X
X
X
+LMLJ[P]LYL]LYZPUN ]H S]L
;OLYTVZ[H[PTWYVWLYS`SVJH[LK
X
X
<UP[\UKLYZPaLK
X
X
:JHSPUNPU^H[LYOLH[L_JOHUNLY
7LYMVYT:JHSPUNJOLJRHUKJSLHUPMULJLZZHY`
X
X
0USL[^H[LY[VVOV[VYJVSK
*OLJRSVHKSVVWZPaPUNSVVWIHJRÄSSNYV\UKTVPZ[\YL
9LK\JLKVYUVHPYÅV^
PUOLH[PUN
X
High Head
Pressure
X
X
9LK\JLKVYUV^H[LYÅV^
PUJVVSPUN
0USL[^ H[LY[VVOV[
(PY[LTWLYH[\YLV\[VMYHUNLPU
OLH[PUN
X
X
X
X
X
:JHSPUNPU^H[LYOLH[L_JOHUNLY
<UP[V]LY JOHYNLK
5VUJVUKLUZHISLZPUZ`Z[LT
X
X
9LZ[YPJ[LKTL[LYPUNKL]PJL
X
9LK\JLK^H[LYÅV^
PUOLH[PUN
X
WH[LY[LTWLYH[\YLV\[VMYHUNL
3V^:\J[PVU
Pressure
X
High Humidity
9LWSHJLVYJSLHU
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
X
X
3V^+PZJOHNL
Air Temperature
in Heating
+PY[`ÄS[LY
Solution
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
:LL)+
*OLJRW\TWVWLYH[PVUVY]HS]LVWLYH[PVUZL[[PUN
*OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L
*OLJRSVHKSVVWZPaPUNSVVWIHJRÄSSNYV\UKTVPZ[\YL
)YPUNYL[\YUHPY[LTW^P[OPUKLZPNUWHYHTL[LYZ
7LYMVYT:JHSPUNJOLJRHUKJSLHUPMULJLZZHY`
*OLJRZ\WLYOLH[HUKZ\IJVVSPUNYL^LPNOPUJOHYNL
VHJ\\TZ`Z[LTHUKYL^LPNOPUJOHYNL=HJ\\T[VTPU
TPJYVUZ
*OLJRZ\WLYOLH[HUKZ\IJVVSPUNWLYJOHY[YLWSHJL
*OLJRW\TWVWLYH[PVUVY^H[LY]HS]LVWLYH[PVUZL[[PUN
7S\NNLKZ[YHPULYVYÄS[LYJSLHUVYYLWSHJL
*OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L7\TWVY
]HS\L¬;
)YPUN^H[LY[LTW^P[OPUKLZPNUWHYHTL[LYZ
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
TVVT\JOJVSK]LU[HPYIYPUNLU[LYPUNHPY[LTW^P[OPU
KLZPNUWHYHTL[LYZ
X
9LK\JLKHPYÅV^
PUJVVSPUN
X
Air [LTWLYH[\YLV\[VMYHUNL
X
0UZ\MÄJPLU[JOHYNL
*OLJRMVYYLMYPNLYHU[SLHRZ
TVVOPNOVMHPYÅV^
*OLJRMHUTV[VYZWLLKZLSLJ[PVUHUKHPYÅV^JOHYt
X
7VVYWLYMVYTHUJL
TVVOPNOVMHPYÅV^
X
UUP[V]LYZPaLK
:LL¸0UZ\MÄJPLU[*HWHJP[`¹
*OLJRMHUTV[VYZWLLKZLSLJ[PVUHUKHPYÅV^JOHY[
9L[\YUHPY[LTWTH`IL[VVSV^
9LJOLJRSVHKZHUKZPaPUNJOLJRZLUZPISLJSNSVHKHUK
OLH[W\TWJHWHJP[`
X
X
17
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Performance Troubleshooting
A-F
Symptom
Only Compressor
Runs
Htg Clg Possible Cause
X
X
;OLYTVZ[H[^PYPUN
*OLJR.^PYPUNH[OLH[W\TW1\TWLY.HUK9MVYMHU
VWLYH[PVU
X
X
-HUTV[VYYLSH`
1\TWLY.HUK9MVYMHUVWLYH[PVU*OLJRMVY3PUL]VS[HNL
HJYVZZISV^LYYLSH`JVU[HJ[Z
*OLJRMHUWV^LYLUHISLYLSH`VWLYH[PVUPMWYLZLU[)
X
X
-HUTV[VY
*OLJRMVYSPUL]VS[HNLH[TV[VY*OLJRJHWHJP[Vr
X
X
;OLYTVZ[H[^PYPUN
*OLJR[OLYTVZ[H[^PYPUNH[VY+?47\[PU;LZ[4VKL
HUK[OLUQ\TWLY@HUK>[V9[VNP]LJHSSMVYMHU
JVTWYLZZVYHUKLSLJ[YPJOLH[
Unit Doesn't
Operate in Cooling
Modulating Valve
Troubleshooting
X
X
9L]LYZPUN=HS]L
X
;OLYTVZ[H[ZL[\W
X
;OLYTVZ[H[^PYPUN
:L[MVYJVVSPUNKLTHUKHUKJOLJR=(*VURVJVPS
0MRVPZZ[\JRY\UOPNOWYLZZ\YL\WI`YLK\JPUN^H[LYÅV^
HUK^OPSLVWLYH[PUNLUNHNLHUKKPZLUNHNLRVJVPS]VS[HNL
[VW\ZO]HS]L
-VY+?4JOLJRMVY¸6¹9=ZL[\WUV[¸)¹PM\ZLZJVU]Z[H[
*OLJR6^PYPUNH[OLH[W\TW+?4YLX\PYLZJHSSMVY
JVTWYLZZVY[VNL[9=JVPS¸*SPJR¹
0TWYVWLYV\[W\[ZL[[PUN
=LYPM`[OL(6Q\TWLYPZPU[OL=WVZP[PVU
5V]HS]LV\[W\[ZPNUHS
*OLJR+*]VS[HNLIL[^LLU(6HUK.5+:OV\SKIL
^OLU]HS]LPZVMMHUKIL[^LLU]HUK]^OLU]HS]L
PZVU
*OLJR]VS[HNL[V[OL]HS]L
9LWSHJL]HS]LPM]VS[HNLHUKJVU[YVSZPNUHSZHYLWYLZLU[H[
[OL]HS]LHUKP[KVLZUV[VWLYH[L
X
5V]HS]LVWLYH[PVU
18
Solution
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Functional Troubleshooting
A-F
Fault
Main Power Problems
HP Fault Code 2
High Pressure
LP/LOC Fault-Code 3
Low Pressure/
Loss of Charge
Htg Clg Possible Cause
X
Solution
Check Line Voltage circuit breaker and disconnect
between 197-254 volts
Check for line voltage between L1 and L2 on the contactor
Check for 24VAC between R and C on DXM 18-31.5
Check primary/secondary voltage on transformer
Check pump operation or valve operation/setting
*OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L
X
Green status LED off
X
9LK\JLKVYUV^H[LYÅV^
in cooling
X
Water t emperature out of range in Bring water temp within design parameters.
Water is too warm.
cooling
X
9LK\JLKVYUVHPYÅV^
in heating
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Dirty air coil- construction dust etc.
Too high of external static. Check static vs blower table
X
Air t emperature out of range in
heating
Bring return air temp within design parameters
X
X
Overcharged with refrigerant
Check superheat/subcooling vs typical operating condition
table
X
X
Bad HP switch
Check switch continuity and operation - Replace
X
X
X
Frozen water heat exchanger
)HK/7>::^P[JO
Thaw heat exchanger (water pressure switches).
9LWSHJL/7>::^P[JO:LL)(
X
X
InsufÄJPLU[JOHYge
Check for refrigerant leaks
X
Compressor pump down at startup
Check charNLHUKZ[HY[\W^H[LYÅV^
X
9LK\JLKVYUV^H[LYÅV^
in heating
7S\NNLKZ[YHPULYVYÄS[LY - clean or replace
X
Inadequate anti-freeze level
*OLJRHU[PMYLLaLZWLJPÄJNYH]P[`^P[OO`KYVTL[LY:LL(9
X
Improper low temperature setting *SPW1>3;Q\TWLYMVYHU[PMYLLaL\ZL)LZ\YLSVVW
has 15º freeze protection
(30°F vs 10°F)
X
Water t emperature out of range
Check pump operation or water valve operation/setting
LT1 Fault - Code 4
Water Low Temperature
X
LT2 Fault - Code 5
Low Air Temperature
X
Bad thermistor
X
9LK\JLKVYUVHPYÅV^
in cooling
X
Air temperature out of range
Bring water temp within design parameters
Check temp and impedance correlation per chart
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Too high of external static - check static vs blower table
Too much cold vent air. Bring entering air temp within
KLZPNUWHYHTL[LYZ[OH[064ZWLJPÄLZ
X
X
Improper low temperature setting Normal airside applications will require. Only setting for
(30°F vs 10°F)
packaged units is 30º.
Bad thermistor
Check temp and impedance correlation per chart
X
X
X
X
Blocked drain
Improper trap
X
Poor drainage
X
X
Condensate Fault Code 6 High
Condensate Level
*OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L
X
X
Moisture on sensor
7S\NNLKHPYÄS[LY
X
X
9LZ[YPJ[LKYL[\YUHPYÅV^
Check for blockage and clean drain
Check trap dimensions and location ahead of vent
Check for piping slope away from unit
Check slope of unit toward outlet
Poor venting - check vent location
Check for moisture shorting to air coil
9LWSHJLHPYÄS[LY
Find and eliminate rectriction - increase return duct and/or
NYPSSLZPaL*OLJRZ[H[PJWYLZZ\YL:LL[OLKPHNYHTVU)+
19
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Functional Troubleshooting
A-F
Fault
Htg Clg Possible Cause
X
X
Under voltage
X
X
Over voltage
Over/Under Voltage Code 7
(Auto Resetting)
Unit Performance
Sentinel-Code 8
Swapped Thermistor
Code 9
X
Solution
Check power supply and 24VAC voltage before and during
operation
Check power supply wire size
Check compressor starting. Need hard start kit?
Check 24VAC and unit transformer tap for correct power
Z\WWS`]VS[HNL:LL(>
Check power supply voltage and 24VAC before and during
operation.
Check 24VAC and unit transformer tap for correct power
supply voltage
Heating Mode LT2>125°F
*OLJRMVYWVVYHPYÅV^VYV]LYcharged unit
X
Cooling Mode LT1>125°F OR
LT2< 40°F
*OLJRMVYWVVY^H[LYÅV^VYHPYÅV^
X
X
LT1 and LT2 swapped
Reverse position of thermistors
X
X
Blower does not operate
*OLJRISV^LYSPUL]VS[HNL:LL)0
Check blower low voltage wiring
ECM Fault Code 10
Blower operating with incorrect
HPYÅV^
Wrong unit size selection
Wrong unit family selection
Wrong motor size
Incorrect blower selection
X
Low Air Coil
Pressure Fault
(ClimaDry) Code 11
X
Low Air Coil
Temperature Fault (ClimaDry) Code 12
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
9LK\JLKVYUVHPYÅV^PUJVVSPUN
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
or ClimaDry
Too high of external static - check static vs blower table
Too much cold vent air - bring entering air temp within
Air temperature out of range
design parameters
Bad pressure switch
Check switch continuity and operation - replace
9LK\JLKHPYÅV^PUJVVSPUN
ClimaDry, or constant fan
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Too high of external static - check static vs blower table
Too much cold vent air - bring entering air temp within
design parameters
Air temperature out of range
Bad thermistor
20
Check temp and impedance correlation per chart
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Functional Troubleshooting
A-F
Fault
Htg Clg Possible Cause
X
X
Commercial
Only
IFC Fault Code 13
Internal Flow
Controller Fault
ESD - ERV Fault
(DXM Only)
Green Status
LED Code 3
Solution
No pump output signal
Check DC voltage between A02 and GND - should be
IL[^LLUHUK=+*^P[OW\TWHJ[P]L:LL(1
Low pump voltage
*OLJRSPUL]VS[HNL[V[OLW\TW:LLWPJ[\YL(6
No pump feedback signal
Check DC voltage between T1 and GND. Voltage should
be between 3 and 4 VDC with pump OFF, and between
HUK=+*^P[O[OLW\TW65:LL()
Bad pump RPM sensor
Replace pump if the line voltage and control signals are
present at the pump, and the pump does not operate
X
X
ERV unit has fault
(Rooftop units only)
Troubleshoot ERV unit fault
X
X
No compressor operation
:LL6US`-HU6WLYH[LZ
No Fault Code Shown
X
X
Compressor overload
Check and replace if necessary
Unit Short Cycles
X
X
X
X
X
X
Control board
+PY[`HPYÄS[LY
Unit in ;est 4VKL
X
X
Unit selection
X
X
X
X
Compressor overload
Thermostat position
Reset power and check operation
*OLJRHUKJSLHUHPYÄS[L r
Reset power or wait 20 minutes for auto exit
Unit may be oversized for space - check sizing for actual
load of space
Check and replace if necessary
Insure thermostat set for heating or cooling operation
Check Thermostat
Location and
Anticipation Setting
Only Fan Runs
X
X
Unit locked out
Check for lockout codes - reset power
X
X
Compressor overload
Check compressor overload - replace if necessary
X
X
Thermostat wiring
Check thermostat wiring at DXM2 - put in Test Mode and
Q\TWLY@HUK9[VNP]LJHSSMVYJVTWYLZZVY
21
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Commissioning Worksheet: Check Test and Start
A-G
Installation Data
Job Name:
Check Test Date:
City:
State or Province:
Zip or Postal Code:
ClimateMaster Model Number:
ClimateMaster Serial Number:
Job site Unit ID # (HP # or Location):
General Contractor:
Mechanical Contractor:
Technician Performing Commissioning/Start-Up Name:
Employer:
Acquire all equipment data from measurements at locations indicated in figure at bottom of page:
Equipment Data
FLOW RATE
EWP - LWP = ∆P
1
2
EWP - PSI IN
minus
LWP - psi Out
equals ∆P
The first step in finding GPM is to subtract leaving water pressure from entering water pressure
using the same pressure gauge. The difference between the two is referred to as ∆P. ∆P can be
converted to GPM by looking in the equipment specification catalog.
Caution: ∆P does not
equal GPM Note: A conversion must be made using specification catalog data to find
GPM from (DeltaP - pressure differential) ∆P measurements.
LOOP FLUID TEMPERATURE Rise/Drop through Coaxial Heat Exchanger
EWT - LWT = ∆T
3
4
EWT - °F IN
Note: Always perform a
water side check before
using refrigerant gauges.
minus
LWT - °F Out
equals Fluid ∆T
∆T is the rise or drop in the fluid temperature as is passes through the Coaxial.
AIR TEMPERATURE Rise/Drop through the air coil
∆T X CFM X 1.08=BTUH Sensible
5 EAT - °F IN
6 LAT - °F Out
minus
equals Air dT
CTS Performed In:
IN
5
EAT
Cooling Mode
Heating Mode
Reversing
AIR
COIL
Valve
Discharge
Hot Gas
OUT
6
COAX
LAT
Suction
Entering Air
Temperature °F
EXPANSION VALVE
IN
Compressor
OUT
Loop Fluid Pressure (In PSI) EWP
1
2
LWP
Loop Fluid Temperature ºF EWT
3
4
LWT
Continued on following page
22
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Commissioning Worksheet: Check Test and Start
A-G
Continued from previous page
EWT - Entering Water Temperature EWP - Entering Water Pressure EAT - Entering Air Pressure ∆ - Delta (Differential)
LWT - Leaving Water Temperature LWP - Leaving Water Pressure LAT - Leaving Air Temperature CFM - Cubic Feet/
Minute BTUH - British Thermal Units/Hour
Performance Data
To check performance and output of a unit, compare the measured unit output with factory specifications. Find actual HE/HR
(in BTUH) using following formula and information gained from pressure/temperature measurements at each unit. This formula
yields equipment Heat of Absorption (Extraction) or Heat of Rejection. Compare with specification catalog data for that unit.
∆T
Temperature
Differential between
EWT and LWT
X
GPM
GPM is dP Conversion
specification catalog
X
Fluid Factor = HE/HR (BTUH)
Fluid Factor - H20/Water500
Antifreeze 485
X
X
= HE/HR
Equipment Performance and Catalog Specification Data should be within 10%
Electrical Setup Data
Power Supply Voltage should be checked to verify proper voltage is being supplied to unit and transformer. Record Voltage
Transformer
(E) at unit:
VAC Transformer leads switched: Yes
Common
No
Transformer has two voltage selections.
208 VAC
All units are factory wired for 230VAC.
24 VAC
For installations with 208VAC units switch transformer lead to the 208V posi- 240 VAC
tion.
Ground Heat Exchanger Data
Loop Type: Check One
Open
Closed (Earth Loop)
Boiler Cooling Tower
Hybrid (State Type)
Other (Description)
Loop Installed By:
Loop Purged and Flushed By:
Freeze Protection Added By:
Loop Protected To °F:
Employer:
Horizontal
Vertical
Standing Column
Type and Amount:
Freeze Protection Verified By:
Filter and Air Coil Check
Unit used for Heating and Cooling during construction? Yes
(Heating
Cooling
Two final inspections should be made to ensure proper operation and equipment longevity.
Check air coil for any debris that would restrice airflow. Air coil checked by:
Check air filter and replace if there is any visible dust or debris. Filter checked by:
Filter replaced: Yes
No
) No
23
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Typical Water Source Refrigeration Circuit (Heating Cycle)
A-G
High Pressure Vapor
Evaporator:
- Evaporates
- Superheats
Condenser:
- Condenses
- Subcools
15 - 22° Drop in Cooling
20 - 30° Rise in Heating
(Will vary on CFM setting)
Air
Coil
Low
Pressure
Vapor
Vapor
Suction
Airflow
Reversing
Compressor
Valve
Coax
TXV
Discharge
Filter
Drier
HWG
Compressor:
- Increases pressure
- Increases temperature
- Superheats
To Loop
Source
LT2:
Heating Liquid Line
(High Pressure Liquid)
LT1:
Low Pressure Liquid
Pressure Drop
Temperature Drop
(30° Minimum Temperature
Differential)
To
Water Heater
Desuperheater
5-10° ∆ T
7° ∆ T Heating
10° ∆ T Cooling
LT1 to LWT in Heating
TZ Units 5°-10° Difference
TE Units 0°-8° Difference
LT1 will be colder!
TZ Coax Water Pressure Drop
TE Coax Water Pressure Drop
Model
GPM
Pressure Drop (psi)
30°F
50°F
70°F
90°F
026
4.0
6.0
7.0
8.0
1.5
3.1
4.1
5.1
1.3
2.6
3.4
4.3
1.1
2.3
3.0
3.8
1.0
2.1
2.7
3.4
038
4.0
6.0
8.0
9.0
1.2
2.6
4.5
5.7
1.0
2.5
4.2
5.2
0.8
2.3
4.0
4.8
0.6
2.1
3.7
4.4
049
5.5
8.3
11.0
12.0
1.1
2.2
3.9
4.5
0.9
2.1
3.6
4.2
0.8
2.0
3.2
3.8
0.7
1.8
3.1
3.5
064
7.0
10.5
14.0
15.0
0.5
1.9
3.9
4.8
0.3
1.8
3.5
4.3
0.2
1.7
3.2
3.9
0.1
1.6
2.9
3.5
072
7.5
11.3
15.0
17.0
1.7
3.9
6.9
8.9
1.5
3.4
6.0
7.7
1.3
3.0
5.4
6.9
1.3
2.8
5.0
6.5
Model
GPM
Pressure Drop (psi)
024
Rev B
2.5
3.0
3.8
4.5
6.0
30°F*
0.8
1.2
1.8
2.7
3.9
50°F
0.3
0.6
1.1
1.6
2.8
70°F
0.2
0.5
0.9
1.2
2.2
90°F
0.2
0.5
0.8
1.2
2.0
030
3.0
3.8
4.5
6.0
7.5
1.7
2.3
2.7
3.8
5.1
0.9
1.2
1.6
2.4
3.5
0.8
1.1
1.4
2.2
3.1
0.8
1.1
1.4
2.1
2.9
036
Rev B
4.0
6.0
6.8
8.0
9.0
0.6
1.8
2.3
3.2
4.0
0.1
1.0
1.5
2.2
2.9
0.1
0.7
1.1
1.8
2.4
0.1
0.7
1.1
1.7
2.3
042
3.8
5.3
7.5
7.9
10.5
1.7
2.7
4.5
4.8
7.4
1.0
1.8
3.1
3.4
5.4
0.9
1.6
2.8
3.1
4.9
0.9
1.5
2.6
2.9
4.7
048
4.5
6.0
6.8
9.0
12.0
1.4
2.0
2.5
4.0
6.5
1.1
1.7
2.1
3.4
5.5
0.9
1.4
1.8
3.0
4.9
0.8
1.3
1.7
2.7
4.5
060
Rev B
6.0
7.5
9.0
12.0
15.0
1.2
2.1
3.1
5.4
8.1
0.9
1.7
2.5
4.6
7.0
0.8
1.5
2.3
4.2
6.4
0.8
1.4
2.2
3.9
6.1
* Based on 15% methanol antifreeze solution
24
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Basic Refrigeration Summary
A-H
Expansion Valve System
• Feeds refrigerant based upon the measured superheat at the compressor suction. It will appropriately “meter” to maintain
superheat setting.
• Able to handle a wide range of capacities (inlet water temperatures)
• Bullet proof - You can’t flood a compressor by overcharging with an expansion valve in the system and thus run the risk of
compressor failure.
• Stores excess refrigerant in condenser
Overcharged System
• High subcooling
• Superheat will be maintained by expansion valve at valve setting
• Basically no change in capacity
• High discharge pressure
Undercharged System
• Low subcooling
• High superheat
• Lower capacity
TXV Stuck Closed (or Restriction)
• High superheat
• High subcooling
• Low suction
• High discharge pressure
TXV Stuck Open
• Low superheat
• Low subcooling
• High suction pressure
Proper TXV Bulb Placement
Discharge
Bulb Upstream
of Equalizer Line
Copeland
Ultratech
Compressor
C
Suction
Line
Equalizer
TXV
TXV
25
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Refrigeration Troubleshooting
A-H
Measuring Superheat and Subcooling
Superheat and subcooling are a good indication of refrigeration efficiency. However, water and air measurements should
always be checked first. Reference Figure 1a & 1b.
To Check SuperHeat and SubCooling
Determining Superheat:
1. Measure the temperature of the suction line at a point near the expansion valve bulb.
2. Determine the suction pressure in the suction line by attaching refrigeration gauges to the schrader connection on the side
of the compressor.
3. Convert the pressure obtained in Step 2 above to the boiling point (sat temp) temperature by using the Press/Temp
conversion table or the gauge set .
4. Subtract the temperature obtained in Step 3 from Step 1. The difference will be the superheat of the unit or the total
number of degrees above the boiling point. Refer to the superheat Table 1 for superheat ranges at specific entering water
conditions.
Example:
The temperature of the suction line at the sensing bulb is read at 59°F. The suction pressure at compressor is 135 psig which
is the equivalent to 47°F saturation temperature from HFC-410A Press/Temp conversion table on the gauge set.
47°F subtracted from 59°F = 12°F Superheat
Measuring Superheat
Superheat = Suction Line Temperature - Suction Saturation Temperature
Digital
Thermometer
Heating Cycle
Suction
Air
Coil
RV
Expansion
Device
Coax
Discharge
HWG
Verify that HWG
is turned off
26
Compressor
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Refrigeration Troubleshooting
A-H
Determining Sub-Cooling:
1. Measure the temperature of the liquid line. Note that the location of the liquid line changes, depending upon the mode
(heating or cooling) for packaged units. For split units, measure liquid line temperature at the compressor section. Liquid
line does not change on a split system.
2. Determine the condenser pressure (High Side) by attaching refrigerant gauges to the schrader connection on the hot gas
discharge line of the compressor.
3. Convert the pressure obtained in step 2 above to the boiling point temperature by using the Press/Temp conversion table or
the gauge set.
4. Subtract the temperature of Step 3 from the temperature of Step 1. The difference will be the sub-cooling value for that unit
(total degrees below the boiling point). Refer to the sub-cooling Table 1 for values at specific entering water temperatures.
Example (HFC-410A):
The condenser pressure at the high pressure service port is 340 psig, which is equivalent to 105°F. The liquid line (between the air
coil and TXV in heating; between the coax and TXV in heating) measures 95°F.
95°F subtracted from 105°F = 10°F sub-cooling
Consult the specific equipment information for refrigeration conditions. If a problem is suspected consult
troubleshooting charts in unit IOM.
Measuring Subcooling
Subcooling = High Pressure Saturation Temperature - Liquid Line Temperature
Digital
Thermometer
Heating Cycle
Suction
Air
Coil
RV
Expansion
Device
Coax
Compressor
Discharge
HWG
Cooling Liquid Line (LT1)
Heating Liquid Line (LT2)
27
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Auxiliary Heat Check
Note: Verify second stage auxiliary
heat by moving one prod to EH2
Note: If dipswitch #6 in bank S1 is
turned OFF, the relays will rapidly turn
on and off and will burn up the relays.
3 T4 T4
0
JW3
T5 T5 T6 T6
CC
P9
CCG
P6
Comp
Relay
EH1
4 EH2
P7
1 24Vdc
24 volts DC
First stage auxiliary heat
CCH
Relay
RV
Relay
LP
LP
LT1
LT1
LT2
LT2
RV
RV
CO
12 CO
A-I
Black
White
ON
P1
4 3 2 1
OFF
Red
L4
P2
ON
OFF
L3
L2
L1
Verify that 24 VDC
is going to auxiliary
control board.
Checking Pump Output
Acc2
Relay
Acc1
Relay
P11
S3
1 2 3 4
AO1 Gnd AO2 Gnd
S1
1 2 3 4 5 6 7 8
Off
On
A0-1
T1 T2 T2
A-J
0.5-10 VDC with Pump Running
Note: P11 is the DXM2’s
output signal is to the pump.
28
COM
COH
R
NC2
COM
NO2
NC1
COM
NO1
R
P3
Factory Use
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Compressor Contactor Voltage Check
18-31.5
Volts AC
P10
T5 T5 T6 T6
T3 T4 T4
P9
CC
CCG
P6
Comp
Relay
EH1
4 EH2
P7
1 24Vdc
1 2 3 4 5 6 7 8
2
On
JW3
CCH
Relay
RV
Relay
LT2
LT2
RV
RV
CO
12 CO
A-K
T1 T2
Acc2
Relay
Acc1
Relay
P11
S3
On
Off
1 2 3 4
AO1 Gnd AO2 Gnd
S1
1 2 3 4 5 6 7 8
Off
On
A0
Check CCH for 24 volts
(Second Stage Operation) A-L
COM
COH
R
COM
NC2
NO2
NC1
COM
NO1
R
P3
A
H
Factory Use
18-31.5
Volts AC
Blue
Blue
Verifying Contactor
A-M
Verify that 24 volts
are going to the
compressor contactor.
18 - 31.5
Volts A/C
Also verify that
contactor has
between 7-20 ohms
across the coil with
the power removed.
29
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Verifying Capacitor
A-N
First, remove the power to the unit and
allow 5-10 minutes for the capacitor to
discharge.
After discharge, remove two wires
from capacity. Read UF on side and
verify with volt meter that can read UF.
It will also show ± range for reading.
Note: Rating will change with
different size units.
Checking Pump Power Cord
A-O
Verify 197-254V on pump power cord.
Note: Before removing cord from
pump, verify that power is turned off
on unit or pump will be damaged!
Note: Thermostat/service tool display
may still show watts even if one leg
of power to the pump (110V) is not
functioning. This can result in LT1
faults in heating and high pressure
faults in cooling.
30
Green White Black
Check 197-254v here
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Replacing Variable-Speed Pump Power Head
A-P
1) You can remove power head from motor with # 25 Torx driver if feedback is out of range.
2) Remove plastic cover to remove Torx head screws.
Verifying Power at Molded Plug For Compressor
A-Q
Comp verify voltage
197-254V
31
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Verifying Antifreeze
A-R
1)
Place hydrometer in
antifreeze.
2)
Read hydrometer
where water hits
hydrometer.
3)
Compare hydrometer
to the charts below.
Example: 15°F
Methanol = .9825
specific gravity
Read here
Ethanol Specific Gravity Chart
Methanol Specific Gravity Chart
Specific Gravity
1.000
1.000
0.995
0.995
0.990
0.985
0.990
0.980
0.975
0.985
0.970
0.965
0.980
0.960
-50°F -40°F -30°F -20°F -10°F 0°F
10°F 20°F 30°F 40°F 50°F
-45.6°C
-34.4°C
-23.3°C
-12.2°C
-1.1°C
10°C
-40°C
-28.9°C
-17.8°C
-6.7°C
4.4°C
Low Temperature Protection
0.975
-5°F
0°F
5°F
10°F
15°F
20°F
25°F
30°F
35°F
-20.6°C
-17.8°C
-15.0°C
-12.2°C
-9.4°C
-6.7°C
-3.9°C
-1.1°C
1.7°C
Low Temperature Protection
Propylene Glycol Specific Gravity Chart
Specific Gravity
1.07
1.06
1.05
1.04
1.03
1.02
1.01
1.00
-40°F
-40°C
-30°F
-20°F
-10°F
0°F
10°F
20°F
-34.4°C -28.9°C -23.3°C -17.8°C -12.2°C -6.7°C
30°F
40°F
-1.1°C
4.4°C
Low Temperature Protection
32
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Second Stage Verification
A-S
1)
Remove
rectifier.
2)
When rectifier is
removed, verify
that pins are not
bent.
3)
Perform an
amp draw and
read the amps.
Then remove
rectifier. Amp
draw should go
down.
4)
With the rectifier
removed from
the compressor,
verify 15-27
VDC.
If there is no
change in
amps, then the
compressor is
not shifting.
15-27
VDC
33
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Verifying 24V at Reversing Valve
A-T
Verify 24V at reversing valve when calling for cooling
To check the solenoid’s magnetic pull, begin by pulling solenoid off of reversing valve. Then energize solenoid and place a
metal screw driver in solenoid. You should feel the screw driver being pulled by the magnetic field.
Checking Reversing Valve at DXM2
T3 T4 T4
P10
1 2 3 4 5 6 7 8
Geothermal Heat Pump Systems
T5 T5 T6 T6
CC
P9
CCG
P6
Comp
Relay
EH1
CCH
Relay
JW3
n
34
4 EH2
1 24Vdc
P7
RV
Relay
18-31.5
Volts AC
LP
LP
LT1
LT1
LT2
LT2
RV
RV
CO
12 CO
A-U
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
A0-2 Jumper
T5 T5 T6 T6
CC
For Mod Valve
IOV
T1 T2 T2 T3 T3 T4 T4
P9
CCG
P10
S2
A0-1 A0-2
1 2 3 4
PWM
For Pump
A0-2 Jumper
Location
IOV
Gnd
S1
On
1 2 3 4 5 6 7 8
Off
n
P6
Comp
Relay
EH1
4 EH2
P7
1 24Vdc
1 2 3 4 5 6 7 8
Off
On
JW3
CCH
Relay
RV
Relay
LT1
LT1
LT2
LT2
RV
RV
CO
12 CO
A-V
PWM
Checking for Power at DXM2
A-W
18-31.5V A/C. Verify
proper voltage to
the board.
2)
If there is no 24V at DXM2, verify that the
breaker is not tripped on the transformer.
On
JW1
A
H
ESD
OVR
C
R
NSB
P2
AL2
C
AL1
R
O
G
W
Y2
P1
Y1
Alarm
Relay
R
C
Off
Gnd B-
Fault
A
1)
Ensure that the power supply to your transformer
is using correct Tap (208/230).
Blue
Yellow
Red
208
Orange
Black
230
Common
35
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
T1 T2
Acc2
Relay
Acc1
Relay
P11
S3
On
Off
1 2 3 4
You should see 3.3-10 Volts A/C D/C when valve is
functioning properly.
AO1 Gnd AO2 Gnd
S1
1 2 3 4 5 6 7 8
Off
On
A0-
Verifying DC Voltage on DXM2 Board
A-X for Modulating Valve Check
The voltage relates to the valve position:
Valve 0% Open
= 3.30 VDC
Valve 50% Open = 5.00 VDC
Valve 100% Open = 10.00 VDC
COH
Valve gets 24 AC volts here.
Note: This check is the output
to the valve from the DXM2.
36
COM
R
NC2
COM
NO2
NC1
COM
NO1
R
P3
A
H
OVR
Factory Use
White
Black
Red
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
TXV Bulb Test
A-Y
Pressure Gauge
Suction pressure increases when
warmed and decreases when bulb
is cooled in cup of ice water
37
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Verifying Dipswitch Position
P10
T1 T2 T2 T3 T3 T4 T4
Dip switch #1 in On Position for
Communicating
COH
COM
R
COM
NC2
NO2
COM
NC1
NO1
R
P3
A
H
OVR
Relay
Factory Use
ESD
C
Acc2
Relay
Acc1
Relay
P11
S3
On
Off
1 2 3 4
AO1 Gnd AO2 Gnd
S1
1 2 3 4 5 6 7 8
Off
On
Fault Status
S2
A0-1 A0-2
1 2 3 4 5 6 7 8
Off
On
JW3
CCH
Relay
A-Z
Replacing High Pressure Water Switch
B-A
One of two high pressure water switches set to 145 PSI.
Note: If you are replacing a high pressure water switch, you can simply screw them off. However, beware that there is no
Schrader core. To prevent water escaping when you remove the high pressure water switch, isolate the loop using flush
valves in units with variable-speed pumps. To isolate the loop in units with modulating valves, use exterior ball valves.
38
Geothermal Heat Pump Systems
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Verifying a Thermistor
B-B
1)
Clamp on digital to read ref next to LT1 to verify sensor
3)
Clamp on the meter close to the sensor location
5)
Resistance reading
2)
Remove this Molex plug to check resistance of the FP1/
LT1 sensor
4)
Temperature reading
39
Tr o u b l e s h o o t i n g G u i d e - Tranquility ® D i g i t a l ( D X M 2 ) P a c k a g e d U n i t s
R e v. : 4 A p r i l , 2 0 1 4
Verifying a Thermistor
B-B
Thermistor Temperature Sensors – The thermistors used
with the DXM2 are NTC (negative temperature coefficient)
type. Table 7 shows the replacement part numbers for
the LT1 and LT2 thermistors. The sensors have a 1%
tolerance and follow the characteristics shown in ‘1%
Sensor Calibration Points Table’. The ‘Nominal resistance at
various temperatures Table’ shows the nominal resistance
at any given temperature and can be used for field service
reference. The sensor will use a minimum of 24 awg wire.
1% Sensor Calibration Points Table
Temp
(°F)
Minimum
Resistance
(Ohm)
Maximum
Resistance
(Ohm)
Nominal
Resistance
(Ohm)
78.5
9523
9715
9619
77.5
9650
9843
9746
76.5
10035
10236
10135
75.5
10282
10489
10385
33.5
30975
31598
31285
32.5
31871
32512
32190
31.5
32653
33310
32980
30.5
33728
34406
34065
1.5
80624
82244
81430
0.5
83327
85002
84160
0.0
84564
86264
85410
Example: See images 4 and 5 on previous page.
If your temperature reading is 71.2 with 11.07 ohms, your
sensor is good.
All thermistors in Tranquility® units can use this chart for
verification
40
Nominal resistance at various temperatures Table
Temp (ºC)
Temp (ºF)
-17.8
-17.5
-16.9
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
0.0
0.5
1.5
10.4
12.2
14.0
15.8
17.6
19.4
21.2
23.0
24.8
26.6
28.4
30.2
32.0
33.8
35.6
37.4
39.2
41.0
42.8
44.6
46.4
48.2
50.0
51.8
53.6
55.4
57.2
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
84.2
86.0
87.8
89.6
91.4
93.2
95.0
96.8
98.6
100.4
102.2
104.0
105.8
107.6
109.4
111.2
113.0
114.8
116.6
118.4
120.2
122.0
123.8
125.6
127.4
129.2
Geothermal Heat Pump Systems
Resistance
(kOhm)
85.34
84.00
81.38
61.70
58.40
55.30
52.38
49.64
47.05
44.61
42.32
40.15
38.11
36.18
34.37
32.65
31.03
29.50
28.05
26.69
25.39
24.17
23.02
21.92
20.88
19.90
18.97
18.09
17.26
16.46
15.71
15.00
14.32
13.68
13.07
12.49
11.94
11.42
10.92
10.45
10.00
9.57
9.16
8.78
8.41
8.06
7.72
7.40
7.10
6.81
6.53
6.27
6.01
5.77
5.54
5.33
5.12
4.92
4.72
4.54
4.37
4.20
4.04
3.89
3.74
3.60
3.47
3.34
3.22
3.10
Temp (ºC) Temp (ºF)
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
131.0
132.8
134.6
136.4
138.2
140.0
141.8
143.6
145.4
147.2
149.0
150.8
152.6
154.4
156.2
158.0
159.8
161.6
163.4
165.2
167.0
168.8
170.6
172.4
174.2
176.0
177.8
179.6
181.4
183.2
185.0
186.8
188.6
190.4
192.2
194.0
195.8
197.6
199.4
201.2
203.0
204.8
206.6
208.4
210.2
212.0
213.8
215.6
217.4
219.2
221.0
222.8
224.6
226.4
228.2
230.0
231.8
233.6
235.4
237.2
239.0
240.8
242.6
244.4
246.2
248.0
249.8
251.6
253.4
Resistance
(kOhm)
2.99
2.88
2.77
2.67
2.58
2.49
2.40
2.32
2.23
2.16
2.08
2.01
1.94
1.88
1.81
1.75
1.69
1.64
1.58
1.53
1.48
1.43
1.39
1.34
1.30
1.26
1.22
1.18
1.14
1.10
1.07
1.04
1.01
0.97
0.94
0.92
0.89
0.86
0.84
0.81
0.79
0.76
0.74
0.72
0.70
0.68
0.66
0.64
0.62
0.60
0.59
0.57
0.55
0.54
0.52
0.51
0.50
0.48
0.47
0.46
0.44
0.43
0.42
0.41
0.40
0.39
0.38
0.37
0.36
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Turning Breaker on in Panel or Auxiliary Heat Control
ON
P1
4 3 2 1
OFF
B-C
L4
P2
ON
OFF
L3
L2
L1
197 254 V
Static Pressure Check
B-D
With the blower at full load air speed,
take a reading from the Digital
Manameter. Check the reading against
the IOM blower tables or in the tables
shown below to determine the maximum
external static pressure.
Verify that all grilles and registers are
open and free.
Static Pressure Probe
inserted into 1/2” Hole
Supply
Air
Return
Air
Use a Magnetic Static Pressure Tip tool
(far right) to check the static pressure.
Digital
Manameter
ECM Blower Performance Static Pressure Tables
Tranquility® 30 (TE) Series
Tranquility® 22 (TZ) Series
Airflow in CFM with wet coil and clean air filter
Airflow in CFM with wet coil and clean air filter
Model
Max ESP
(in. wg)
024
0.75
030
0.5
0.9
036
0.6
049
1.0
042
0.6
064
0.7
048
0.75
072
0.7
060
0.75
Model
Max
ESP
(in. wg)
026
1.0
038
Airflow is controlled within 5% up to the Max ESP shown with wet coil.
Magnetic Static
Pressure Tip
Airflow is controlled within 5% up to the Max ESP shown with wet coil.
Factory shipped on default CFM.
41
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Locating Thermostat Version and DXM2 Version
B-E
INSTALLER SETTINGS
THERMOSTAT CONFIG
SYSTEM CONFIG
ACCESSORY CONFIG
INPUT DEALER INFO
HUMIDITY CONFIG
TEMPERATURE CONTROL
DEMAND REDUCTION CNFG
SERVICE MODE
RESTORY DEFAULTS
DXM2
ATC32U02
SELECT OPTION
PREVIOUS
3.3
C 1.0
Locate the version level of the DXM2 board and thermostat
or service tool on the screen. You can locate the part number
on the board and compare it to the table below.
Note: In the future, if there are software changes, the part
number will also change.
Program History of DXM2
Part Number / Dots
Version Number
17B002N10
Version 3.3
17B0002N06
17B0002N05
17B0002N02
with 3 Yellow Dots
Version 1.2
2 Yellow Dots
1 Yellow Dot
Version 1.1
3 Gray Dots
Version 1.0
2 Gray Dots
Version 0.3
1 Gray Dot
No Dots
Shows up as nothing
UltraCheck - EZ™ Motor Diagnostic Tool
B-F
42
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Checking Dipswitches on DXM2
B-G
Verify that dipswitch number 1
is in the ‘On’ position.
If dipswitch number 1 is in the
‘Off’ position, the thermostat
will not function.
Under most residential
situations, dipswitch banks
1 and 2 will all be in the ‘On’
position.
If any of these dipswitches
need to be switched to ‘Off’,
consult the DXM2 AOM
(97B0003N15).
Magnet Test to Shift Reversing Valve into Cooling
B-H
Use a magnet to pull the internal slide to one side or another.
Discharge line
Strong magnet
placed on air
coil side
Line to
coax
Line to
air coil
Line to
compressor
(suction)
43
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Checking Blower Line Voltage
B-I
197254V
Acc2
Relay
Acc1
Relay
COH
COM
R
COM
NC2
NO2
NC1
R
NO1
P3
A
H
OVR
C
ESD
Geothermal Heat Pump Systems
COM
Factory Use
Alarm
Relay
R
NSB
AL2
P2
44
P10
P11
S3
On
JW1
Off
1 2 3 4
AO1 Gnd AO2 Gnd
S1
1 2 3 4 5 6 7 8
Off
On
Fault Status
S2
A0-1 A0-2
1 2 3 4 5 6 7 8
Off
Micro
U1
On
In order to have your thermostat acknowledge
that the unit has a modulating valve instead
of incorrectly showing a variable-speed pump,
connect a piece of thermostat wire between GND
and T1 so the DXM2 board does not see feedback.
T1 T2 T2 T3 T3
For a Modulating Valve that
B-J Loses Configuration on Thermostat
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Hard Reset of Thermostat
B-K
Use a thermostat wire to connect TP2 and TP3 on the thermostat board.
45
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Units Having LT1 Lockouts In Heating with Modulating Valve
B-L
When running unit in Y1 and Y2, if valve position moves slightly below 50% open, there is a greater impact on GPM. Putting a
pressure-reducing valve ahead of heat pump will prevent valve from moving below 50% open. Set pressure reducing valve to
30 PSI.
Shut Off
Ball Valves
for Isolation
Well
Tank
Water Out
Water In
50 - 70 PSI
Pressure- Typical Household
Boiler Reducing Pressure for Wells
Drains Valve 30 PSI
46
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Definitions of Conditions
CONTACTOR OPEN - NOT BUZZING
When the contactor is open but not buzzing, it is an indication
of no voltage to its coil, or that there is voltage to its coil but
the coil is open circulated. If unit does not start, check voltage at coil with volt meter. If there is voltage, the coil is open
circulated. Replace the contactor. If no voltage, check power
to control circuit.
LOW SUCTION PRESSURE
If low suction pressure is suspected, switch to heating mode
and check the suction pressure. This suction pressure should
not be lower than the refrigerant pressure equivalent to entering water temperature minus 40°F, provided there is adequate water flow and entering air is approximately at 70°F.
OPEN HIGH PRESSURE SWITCH
It is factory set to shut down the unit at 600 PSI.
EXCESSIVE DISCHARGE PRESSURE
If excessive discharge pressure is suspected, switch to heating mode and check the discharge pressure. This discharge
pressure should not be higher than the refrigerant pressure
equivalent to entering air dry bulb temperature plus 60°F, provided there is proper air flow and entering water temperature
is approximately at 70°F.
COMPRESSOR OVERLOADS OPEN AND CLOSE
The purpose of overloads is to quickly sense excessive
compressor current and/or temperature and open the power
circuit to prevent burnout of motor. This condition may be
caused by repeated call to start before pressures equalize,
low voltage, tightness of new compressor, excessive current
draw or the temperature of the suction gas being too warm
to adequately cool the motor. Warm suction gas may be due
to an under charge, too much superheat, restriction in liquid
or suction line, or restriction in capillary. When the overload
opens, it may take from 5 to 30 minutes for it to cool sufficiently to close.
CONTACTOR OPEN - BUZZING
When the contactor is open but buzzing, it is an indication
that its coil is energized but the contactor is unable to close.
NORMAL VOLTAGE TO COIL
Check voltage to coil. It should not be lower than 10% below
rated voltage as the contractor tries to close. If voltage is
normal, the mechanism may be tight or fouled. Remove
and inspect mechanism. Clean if necessary. If too sluggish,
replace contactor.
BELOW NORMAL VOLTAGE TO COIL
Check voltage to coil. If it is lower than 10% below rated voltage, it is probably due to low supply voltage, faulty transformer or phase loss.
OPEN OVERLOAD SWITCH
Sometimes overloads will fail with contacts in the open position, or contacts may be closed but not conducting electrically. To check this, disconnect power circuit. If unit starts,
replace overload if it is located in the electrical box. If unit
does not start, the trouble is elsewhere.
BURNED CONTACTS
Sometimes contacts will close mechanically but will not conduct electrically. To check for this, disconnect power circuit
and measure contact resistance with ohmmeter. The meter
should read zero ohms. If meter does not read zero ohms,
replace contactor. If ohmmeter is not available, disconnect
power circuit, place temporary jumpers from line side of contacts and close power circuit. If unit starts, replace contactor.
If unit does not start, trouble is elsewhere. Burned contacts
may also cause high current draw.
EXPANSION VALVE BULB LOST CHARGE
If the bulb of the expansion valve loses its charge,
A-Y
there will be no pressure to open the valve, thus
causing low suction pressure. To check this,
remove expansion valve bulb from suction line and hold it in
your hand. If the suction pressure does not increase in a few
minutes and there are no restrictions in the refrigerant circuit,
it is an indication that the bulb has lost its charge. Replace
expansion valve.
DISTRIBUTOR TUBE RESTRICTED
To check this, check suction pressure (very low suction
pressure is an indication of restriction or excessive under
charge) on cooling cycle temporarily cut off air to air coil and
allow unit to operate. If there is a partial restriction or excessive undercharge, frost will occur at that point. If there is no
restriction, the evaporator coil will frost uniformly. If there is
a total restriction anywhere in the refrigerant circuit from the
condenser through the evaporator and back to the compressor, there will be no frost, the suction pressure may go
into vacuum and the discharge pressure will correspond to
approximately ambient temperature because there will be no
vapor to compress.
EXCESSIVE SUPERHEAT
Superheat is the temperature of the refrigerant vapor above
the temperature corresponding to the vapor pressure. It
should be 3° to 25°F. Excessive superheat is an indication
that the evaporator is “starved”. That is, not enough liquid
refrigerant in the coil. Excessive superheat may be due to
undercharge, restriction in refrigerant circuit, low discharge
pressure, expansion valve bulb lost charge, too much load on
evaporator, or refrigerant flashing ahead of expansion valve
or capillary due to pressure drop.
HIGH AMPS
Refer to nameplate on unit. Amps should not exceed rating
more than 10%.
POOR EXPANSION VALVE BULB
INSTALLATION
A-H
The expansion valve bulb should be securely
mounted and properly located on clean pipe, parallel to pipe with firm metal contact and wrapped with insulation
tape to assure proper sensing of suction line temperature.
47
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Definitions of Conditions
MOTOR WINDINGS OVERHEATED
When the compressor is drawing normal amps and becomes
overheated and cycles by the overload, it is due to the temperature of the suction gas being too high to remove heat
from the compressor motor. This in turn is due to undercharge, superheat too high or restriction in refrigerant circuit.
HIGH OR LOW VOLTAGE
Check nameplate on unit for voltage rating. Check voltage
at contactor or starter while the unit is operating. This voltage should not vary by more than 10% plus or minus from
nameplate.
EXPANSION VALVE EQUALIZER LINE RESTRICTED
Check the equalizer line visually for external damage.
EXPANSION VALVE DIAPHRAGM CASE COLDER THAN
THE BULB
If the diaphragm case becomes colder than the bulb, the
charge will leave the bulb and condense in the diaphragm
case. Thus, bulb control will be lost.
48
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DXM2 Board Layout and Dipswitches
P10
S1
P11
1 2 3 4
S3
Off
On
Off
On
1 2 3 4 5 6 7 8
JW1
R
A0-2
A0-1
Fault Status
Gnd B-
P5
A+ 24V
P4
Acc2 Relay
Acc1 Relay
T5 T5 T6 T6
Entering Hot water
Temperature
Leaving
air temp
Variable
speed pump
Leaving
water temp
Entering
water temp
Factory Use
Conventional
stat connection
Cabinet temperature sensor
(with variable speed pump)
(Packaged units)
Communications
and HWG Settings
COM
COH
R
COM2
NC2
NO2
COM1
NC1
NO1
R
P3
A
H
ESD
OVR
C
NSB
R
P2
AL2
AL1
C
R
O
G
W
Y2
P1
Alarm Relay
Y1
Service tool
connection
C
Communicating
stat connection
Off
Micro
U1
Com
1 2 3 4 5 6 7 8
S2
On
(240Vac)
Fan Enable
CCH Relay
JW3
Test
N.O.
Compressor
Discharge
Temperature
T1 T2 T2 T3 T3 T4 T4
Fan Speed
Use 4 mounting scr
#6 sheet metal scre
1” long
AO1 Gnd AO2 Gnd
CC
P6
CCG
EH1
4 EH2
P7
1 24Vdc
Comp Relay
RV Relay
P12
(240Vac)
P9
N.C. N.O.
Configure
modulating valve
or variable
speed pump
Electric heat
connection
1
HP
HP
LP
LP
LT1
LT1
LT2
LT2
RV
RV
CO
12 CO
12V
IN
OUT
Gnd
NC
ECM Motor
Connection
P8
Test Button
to Speed up
Time Delays
Water Coil
Low Temp
Limit Setting.
JWT-LT1 jumper
Factory low
should be clipped voltage molex
for low temp
connection for
(antifreeze)
unit harness
operation
24V to compressor
second-stage
solenoid for Y2/full
load capacity
Accessory
relays refer
to DXM2 AOM
for configuration
49
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DXM2 Controls
FIELD SELECTABLE INPUTS
Test mode: Test mode allows the service technician to check
the operation of the control in a timely manner. By momentarily pressing the TEST pushbutton, the DXM2 control
enters a 20 minute test mode period in which all time delays
are sped up 15 times. Upon entering test mode, the Status
and Fault LED displays will change. The Status LED will either flash rapidly to indicate the control is in the test mode, or
display a numeric flash code representing the current airflow
if an ECM blower is connected and operating. The Fault LED
will display the most recent fault condition in memory. Note:
A flash code of 1 indicates there have been no faults stored
in memory.
For diagnostic ease at conventional thermostats, the alarm
relay will also cycle during test mode. The alarm relay will
cycle on and off similar to the Fault LED to indicate a code
representing the last fault, at the thermostat.
A0-2: Configure Modulating Valve or Variable-Speed
Pump (vFlow™ Models Only)
Set A0-2 jumper (see Figure on page 5) to “0 - 10v” if using
Internal Modulating Motorized Valve or “PWM” if using Internal Variable-Speed Pump. This applies only to vFlow™ units
with Internal Speed Water Flow Control.
DIP SWITCHES
Note: In the following field configuration options, DIP
switches should only be moved when power is removed
from the DXM2 Control to ensure proper operation.
DIP Package #1 (S1)
DIP Package #1 is 8 position and provides the following
setup selections.
The test mode can be exited by pressing the TEST pushbutton for 3 seconds. The test Mode can also be entered and
exited by cycling the G input, 3 times within a 60 second time
period.
DIP 1.1: Unit Performance Sentinel Disable - Provides field
selection to disable the UPS feature.
During Test Mode, the control monitors to see if the LT1 and
LT2 thermistors are connected and operating properly. If the
control is in Test Mode, the control will lockout, with Code 9,
after 60 seconds if:
DIP 1.2: Compressor Relay Staging Operation - Provides
selection of Compressor Relay staging operation. The
Compressor Relay can be selected to turn on with Stage 1
or Stage 2 call from the thermostat. This is used with Dual
Stage units (2 compressors where 2 DXM2 Controls are
being used) or with master/slave applications. In master/slave
applications, each compressor and fan will stage according to
its appropriate DIP 1.2. If set to stage 2, the compressor will
have a 3 second on-delay before energizing during a Stage
2 demand. Also, if set for stage 2, the Alarm Relay will NOT
cycle during Test Mode.
a) the compressor is On in Cooling Mode and the LT1 sensor is colder than the LT2 sensor. or,
b) the compressor is On in Heating Mode and the LT2 sensor is colder than the LT1 sensor.
Retry Mode: If the control is attempting a retry of a fault, the
Fault LED will slow flash (slow flash = one flash every 2 seconds) to indicate the control is in the process of retrying.
Field Configuration Options - Note: In the following field
configuration options, jumper wires should be clipped ONLY
when power is removed from the DXM2 control.
Note: Jumper 3 must not be clipped prior to adding
antifreeze to the water loop. Antifreeze protection to 10°F
required. Clipping JW3 without antifreeze may result in
freeze damage and will void the unit warranty.
Water coil low temperature limit setting: Jumper 3 (JW3LT1 Low Temp) provides field selection of temperature limit
setting for LT1 of 30°F or 10°F [-1°F or -12°C] (refrigerant
temperature).
Not Clipped = 30°F. Clipped = 10°F.
Alarm Relay Setting - Jumper 1 (JW1-AL2 Dry) provides
field selection of alarm function when Alarm Relay is energized.
Not Clipped = AL1 connected to R (24VAC) with Alarm Relay
active.
Clipped = Dry contact connection between AL1 and AL2 with
Alarm Relay active.
50
JUMPERS (Set at Factory)
On = Enabled. Off = Disabled.
On = Stage 1. Off = Stage 2.
DIP 1.3: Thermostat Type (Heat/Cool) - Provides selection
of thermostat type. Heat Pump or Heat/Cool thermostats
can be selected. When in Heat/Cool Mode, Y1 is input call
for Cooling Stage 1, Y2 is input call for Cooling Stage 2,
W1 is input call for Heating Stage 1, and O/W2 is input call
for Heating Stage 2. In Heat Pump Mode, Y1 is input call
for Compressor Stage 1, Y2 is input call for Compressor
Stage 2, W1 is input call for Heating Stage 3 or Emergency
Heat, and O/W2 is the input call for RV (heating or cooling
dependent upon DIP 1.4).
On = Heat Pump. Off = Heat/Cool.
DIP 1.4: Thermostat Type (O/B) - Provides selection of
thermostat type. Heat pump thermostats with “O” output on
with Cooling or “B” output on with Heating can be selected.
On = HP Stat with O output with cooling. Off = HP Stat with B
output with heating.
DIP 1.5: Dehumidification Mode - Provides selection of
normal or Dehumidification Fan Mode. In Dehumidification
Mode, the fan speed will be adjusted for Cooling. In Normal
Mode, the fan speed will be normal during Cooling.
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DXM2 Controls
On = Normal Fan Mode. Off = Dehumidification Mode.
DIP 1.6: DDC Output at EH2 - DIP Switch 1.6 provides
selection for DDC operation. If set to DDC Output at EH2, the
EH2 terminal will continuously output the last fault code of the
controller. If set to EH2 normal, then the EH2 will operate as
standard electric heat output.
On = EH2 Normal. Off = DDC Output at EH2.
DIP 1.7: Boilerless Operation - Provides selection
of Boilerless Operation. In Boilerless Mode, only the
compressor is used for Heating Mode when LT1 is above
the temperature specified by the setting of DIP 1.8. If DIP
1.8 is set for 50°F, then the compressor is used for heating
as long as LT1 is above 50°F. Below 50°F, the compressor is
not used and the control goes into Emergency Heat Mode,
staging on EH1 and EH2 to provide heating.
Table 1: Accessory Relay 1 Configuration
DIP 2.1
DIP 2.2
DIP 2.3
ACC1 Relay Option
ON
ON
ON
Cycle with fan
OFF
ON
ON
Digital night setback
ON
OFF
ON
Water valve – Slow opening
ON
ON
OFF
Outside air damper
OFF
ON
OFF
Dedicated Dehumidification Mode
option – Dehumidistat
OFF
OFF
OFF
Dedicated Dehumidification Mode
option – Humidistat
OFF
OFF
ON
Hydronic Economizer – 1st Stage
ON
OFF
OFF
Hydronic Economizer – Both
Stages
All other DIP combinations are invalid
On = normal. Off = Boilerless operation.
Table 2: Accessory Relay 2 Configuration
DIP 1.8: Boilerless Changeover Temperature - Provides
selection of boilerless changeover temperature setpoint.
On = 50°F. Off = 40°F.
DIP Package #2 (S2)
DIP Package #2 is 8 position and provides the following
setup selections.
DIP Package #2 (S2) - A combination of dip switches 2.1,
2.2, 2.3, and 2.4, 2.5, 2.6 deliver configuration of ACC1 and
ACC2 relay options respectively. See Table 7a for description
and functionality.
DIP 2.7: Auto Dehumidification Fan Mode or High Fan Mode
- Provides selection of Auto Dehumidification Fan Mode or
High Fan Mode. In Auto Dehumidification Mode, the Fan
Speed will be adjusted during Cooling IF the H input is active.
In High Fan Mode, the Fan will operate on high speed when
the H input is active.
On = Auto Dehumidification Mode (default). Off = High Fan
Mode.
DIP 2.8: Factory Setting - Normal position is On. Do not
change selection unless instructed to do so by the Factory.
DIP 2.4
DIP 2.5
DIP 2.6
ACC2 Relay Option
ON
ON
ON
Cycle with compressor
OFF
ON
ON
Digital night setback
ON
OFF
ON
Water valve – Slow opening
OFF
OFF
ON
Humidifier
ON
ON
OFF
Outside air damper
All other DIP combinations are invalid
DIP 3.2: HWG Test Mode: Provides forced operation of the
HWG pump output, activating the HWG pump output for up to
five minutes.
On = HWG test mode. Off = Normal HWG mode (default).
DIP 3.3: HWG Temperature: Provides the selection of the
HWG operating setpoint.
On = 150°F [66°C]. Off = 125°F [52°C] (default).
DIP 3.4: HWG Status: Provides HWG operation control.
On = HWG mode enabled. Off = HWG mode disabled
(default).
DIP Package #3 (S3)
SAFETY FEATURES
DIP Package #3 is 4 position and provides the following
setup selections.
The following safety features are provided to protect the
compressor, heat exchangers, wiring and other components
from damage caused by operation outside of design
conditions.
DIP 3.1: Communications configuration: Provides selection
of the DXM2 operation in a communicating system. The
DXM2 may operate as a communicating master or slave
device depending on the network configuration. In most
configurations, the DXM2 will operate as a master device.
On = Communicating Master device (default). Off =
communicating Slave device.
Anti-Short Cycle Protection - The control features a 5
minute anti-short cycle protection for the compressor.
Note: The 5 minute anti-short cycle also occurs at power
up.
Random Start - The control features a 5-80 second random
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DXM2 Controls
start upon power up. The random start delay will be present
after a control power up and after returning from Night
Setback or Emergency Shutdown modes.
Extended Compressor Operation Monitoring - If the
compressor relay has been on for 4 continuous hours, then
the control will automatically turn off the compressor relay
and wait the short cycle protection time. All appropriate
safeties will be monitored during the off time. If all operation
is normal, and if the compressor demand is still present, the
control will turn the compressor back on.
Fault Retry - In Fault Retry Mode, the Fault LED begins slow
flashing to signal that the control is trying to recover from a
fault input. The DXM2 Control will stage off the outputs and
then “try again” to satisfy the thermostat call for compressor.
Fault Code 3: Loss of Charge Switch – The Loss of Charge
Switch must be open and remain open for 30 continuous
seconds during a compressor “on” cycle to be recognized
as a Loss of Charge fault. If the Loss of Charge switch is
open for 30 seconds prior to compressor power up it will
be considered a Loss of Charge fault. The Loss of Charge
Switch input is bypassed for the initial 120 seconds of a
compressor run cycle. When the Test mode is active, the
Fault LED will display a fault code of 3 for a Loss of Charge
fault.
Fault Code 4: Water Coil Low Temperature Cut-Out Limit
(LT1) - The control will recognize an LT1 fault, during a
compressor run cycle if:
a)
the LT1 thermistor temperature is below the selected
low temperature protection limit setting for at least 50
seconds, AND
b)
the LT1 thermistor temperature is rising (getting
warmer) at a rate LESS than 2°F per 30 second time
period.
CAUTION!
CAUTION! Do not restart units without inspection and remedy of faulting condition. Equipment damage may occur.
Once the thermostat input calls are satisfied, the control will
continue on as if no fault occurred. If 3 consecutive faults
occur without satisfying the thermostat call for compressor,
then the control will go to Lockout Mode. The last fault
causing the lockout will be stored in memory and is displayed
at the Fault LED by entering the Test mode.
Note: LT1 and LT2 faults are factory set for one try, so
there will be no “retries” for LT1 and LT2 faults. The
control will only try one time for these faults.
FAULT CODES
Lockout - In Lockout Mode, the Fault LED will begin fast
flashing. The compressor relay is turned off immediately.
The fan output will be turned off after the current blower off
delay unless auxiliary heat is active. The Lockout Mode can
be “soft” reset via the thermostat by removing the call for
compressor, or by a “hard” reset (disconnecting power to the
control). The fault code will be stored in non-volatile memory
that can be displayed by the Fault LED by entering the Test
mode, even if power was removed from the control.
Lockout with Emergency Heat - If the DXM2 is configured for Heat Pump thermostat Mode (see DIP 1.3), the
DXM2 is in Lockout Mode, and the W input becomes active,
then Emergency Heat Mode will occur during Lockout. For
Emergency Heat, the fan and auxiliary heat outputs will be
activated.
Fault Code 2: High Pressure Switch – When the High
Pressure switch opens due to high refrigerant pressures, the
compressor relay is de–energized immediately. The High
Pressure fault recognition is immediate (does not delay for 30
continuous seconds before de–energizing the compressor).
When the Test mode is activated, the Fault LED will display a
fault code of 2 for a High Pressure fault.
52
The LT1 input is bypassed for the initial 120 seconds of a
compressor run cycle. When the Test mode is active, the
Fault LED will display a fault code of 4 for a LT1 fault.
Fault Code 5: Air Coil Low Temperature Cut-Out (LT2) The control will recognize an LT2 fault, during a compressor
run cycle if:
a)
the LT2 thermistor temperature is below the low
temperature protection limit setting for at least 50
seconds, AND
b)
the LT2 thermistor temperature is rising (getting
warmer) at a rate LESS than 2°F per 30 second time
period.
The LT2 input is bypassed for the initial 120 seconds of a
compressor run cycle. When the Test mode is active, the
Fault LED will display a fault code of 5 for a LT2 fault.
Fault Code 6: Condensate Overflow - The Condensate
Overflow sensor must sense overflow levels for 30
continuous seconds to be recognized as a CO fault.
Condensate Overflow will be monitored at all times during
the compressor run cycle. When the Test mode is active,
the Fault LED will display a fault code of 6 for a Condensate
Overflow fault.
Fault Code 7: Over/Under Voltage Shutdown - An Over/
Under Voltage condition exists when the control voltage is
outside the range of 18VAC to 31.5VAC. Over/UnderVoltage
Shutdown is self-resetting in that if the voltage comes back
within range of 18.5VAC to 31VAC for at least 0.5 seconds,
then normal operation is restored. This is not considered
a fault or lockout. If the DXM2 is in over/under voltage
shutdown for 15 minutes, the Alarm Relay will close. When
the Test mode is active, the Fault LED will display a fault
code of 7 for an Over/Under Voltage Shutdown.
Fault Code 8: Unit Performance Sentinel – UPS – The
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DXM2 Controls
UPS feature warns when the heat pump is operating
inefficiently. A UPS condition exists when:
a)
b)
In Heating Mode with compressor energized, if LT2 is
greater than 125°F for 30 continuous seconds, or
In Cooling Mode with compressor energized, if LT1
is greater than 125°F for 30 continuous seconds, OR
LT2 is less than 40°F for 30 continuous seconds.
If a UPS condition occurs, the control will immediately go to
UPS warning. The status LED will remain on as if the control
is in Normal Mode. (see “LED and Alarm Relay Operation
Table”). Outputs of the control, excluding Fault LED and
Alarm Relay, will NOT be affected by UPS. The UPS
condition cannot occur during a compressor off cycle. During
UPS warning, the Alarm Relay will cycle on and off. The cycle
rate will be On for 5 seconds, Off for 25 seconds, On for 5
seconds, Off for 25 seconds, etc. When the Test mode is
active, the Fault LED will display a fault code of 8 for an UPS
condition.
Fault Code 9: Swapped LT1/LT2 Thermistors - During
Test Mode, the control monitors to see if the LT1 and LT2
thermistors are connected and operating properly. If the
control is in Test Mode, the control will lockout, with Code 9,
after 60 seconds if:
a)
the compressor is On in Cooling Mode and the LT1
sensor is colder than the LT2 sensor. Or,
b)
the compressor is On in Heating Mode and the LT2
sensor is colder than the LT1 sensor.
Pressure fault will keep the unit from operating in the cooling
or reheat modes, but heating operation will still operate
normally.
Fault Code 12: Low Air Temperature (Dedicated
Dehumidification Mode Units Only) – The control will
recognize an Low Air Temperature fault, during cooling,
reheat, or constant fan operation if the LAT thermistor
temperature is below 35 degrees for 30 continuous seconds.
When the Test mode is activated, the Fault LED will display
a fault code of 12 for a Low Air Temperature fault. Note: Low
Air Temperature fault will keep the unit from operating in the
cooling, reheat, or constant fan modes, but heating operation
will still operate normally.
Internal Flow Center Faults – When operating an internal
flow center, the DXM2 monitors the pump feedback signal
and may detect one of several pump faults. The control may
detect locked rotor, low voltage, no flow, or bad pump sensor conditions that will result in an internal flow center fault.
When the Test mode is active, the Fault LED will display a
fault code of 13 for a internal flow center fault.
ESD – The ESD (Emergency Shut Down) Mode is utilized
when the ERV (Energy Recovery Ventilator) option is applied
to an TRE series rooftop unit to indicate an ERV fault. A
contact closure at the ERV unit will connect common to the
ESD terminal, which will shut down the rooftop/ERV units.
The green Status LED will flash code 3 when the unit is in
ESD Mode. The ESD Mode can also be enabled from an
external common signal to terminal ESD (see “Thermostat
Inputs” section for details).
When the Test mode is active, the Fault LED will display a
fault code of 9 for a Swapped Thermistor fault.
Fault Code 10: ECM Blower Fault – When operating
an ECM blower, there are two types of ECM Blower fault
conditions that may be detected.
a)
An ECM blower fault will be detected and the control
will lockout after 15 seconds of blower operation with
the blower feedback signal reading less than 100
RPM.
b)
An ECM blower fault will be detected when the ECM
configuration is incorrect or incomplete. For this fault
condition, the control will continue to operate using
default operating parameters.
When the Test mode is active, the Fault LED will display a
fault code of 10 for an ECM Blower fault.
Fault Code 11: Low Air Coil Pressure Switch (Dedicated
Dehumidification Mode Units Only) – When the Low Air Coil
Pressure switch opens due to low refrigerant pressure in the
cooling or reheat operating mode, the compressor relay is
de–energized immediately. The Low Air Coil Pressure fault
recognition is immediate (does not delay for 30 continuous
seconds before de–energizing the compressor). When the
Test mode is activated, the Fault LED will display a fault code
of 11 for a Low Air Coil Pressure fault. Note: Low Air Coil
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DXM2 Wiring Diagram with Internal Flow Controller 96B0005N60
This diagram includes typical wiring details but is not applicable to all units. For specific unit wiring, refer to the diagram or the
units’ control panel.
54
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DXM2 Wiring Diagram with Motorized Modulating Water Valve 96B0005N62
This diagram includes typical wiring details but is not applicable to all units. For specific unit wiring, refer to the diagram or the
units’ control panel.
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ATC32U02 Thermostat Screens and Set Up
2.0 Installer Menu Settings
2.1
INSTALLER MENU SETTINGS ACCESS
The Installer Settings can be accessed at any time from the
Main Operating screen by holding the up/down arrows simultaneously for 5 seconds while the thermostat is in OFF Mode.
2.2.1
STAGING
Adjust the staging option using the up/down arrow buttons.
Press the center button to save changes.
• Single Stage – for control of a single stage
compressor applications
• Multi-Stage (default) – for control of multistage compressor applications
THERMOSTAT
CONFIGURATION
SINGLE STAGE
MULTI STAGE
Installer Menu Settings Overview
Thermostat Configuration
System Configuration
Airflow Selection
Option Selection
Unit Configuration
Pump Configuration
Valve Configuration
Accessory Configuration
Air Filter
Humidifier
UV Lamp
Air Cleaner
Input Dealer Information
Humidity Configuration
Temperature Algorithm
Demand Reduction Configuration
Service Mode
Manual Operation
Control Diagnostics
Dipswitch Configuration
Fault History
Clear Fault History
Restore Defaults
SELECT OPTION
PREVIOUS
2.2.2
AUXILIARY HEAT
Adjust the Auxiliary Heat options using the up/down arrow
buttons. Press the center button to save changes.
• Electric (default) – for control of a system with
electric auxiliary heat
• Multi-Fuel – for control of a system with furnace
for auxiliary heat
• No Auxiliary Heat – for control of a system with no
auxiliary heat
THERMOSTAT
CONFIGURATION
ELECTRIC
MULTI FUEL
NO AUXILIARY HEAT
2.2
THERMOSTAT CONFIGURATION
Upon initial power up, the communicating thermostat will
prompt the installer for the thermostat configuration settings.
Model number and software version of thermostat and
software version of connected DXM2 are also displayed on
this screen.
INSTALLER SETTINGS
THERMOSTAT CONFIG
SYSTEM CONFIG
ACCESSORY CONFIG
INPUT DEALER INFO
HUMIDITY CONFIG
TEMPERATURE CONTROL
DEMAND REDUCTION CNFG
SERVICE MODE
SETPOINT LIMITS
RESTORE DEFAULTS
DXM2
ATC32U02
SELECT OPTION
PREVIOUS
56
SAVE
SELECT OPTION
PREVIOUS
SAVE
2.2.2.1 AUXILIARY HEAT CONFIGURATION
Select Electric Auxiliary Heat mode
• Auxiliary Heat to Supplement Pump
• Auxiliary Heat for Emergency Heat Only
THERMOSTAT
CONFIGURATION
AUXILIARY HEAT TO
SUPPLEMENT HEAT PUMP
AUXILIARY HEAT FOR
EMERGENCY HEAT ONLY
3.3
C 1.0
SELECT OPTION
PREVIOUS
Geothermal Heat Pump Systems
SAVE
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ATC32U02 Thermostat Screens and Set Up
3.0 System Configuration
Use the System Configuration option on the start-up screen
to adjust critical equipment settings.
The System Configuration information will be automatically
obtained from each communicating control in the system.
Note 1: The Airflow Selection menu (section 3.1) will not be
present if the connected communicating control system has
no blower.
Note 2: The Pump Configuration menu (section 3.4) will
not be present if the connected communicating control is
configured for No Loop Configuration (OTHER).
Note 3: The Valve Configuration menu (section 3.5) will
not be present if the connected communicating control is
configured for No Loop Configuration (OTHER).
INSTALLER SETTINGS
THERMOSTAT CONFIG
SYSTEM CONFIG
ACCESSORY CONFIG
INPUT DEALER INFO
HUMIDITY CONFIG
TEMPERATURE CONTROL
DEMAND REDUCTION CNFG
SERVICE MODE
SETPOINT LIMITS
RESTORE DEFAULTS
DXM2
ATC32U02
SELECT OPTION
PREVIOUS
3.3
C 1.0
AIRFLOW SELECTION
OPTION SELECTION
TE026
PUMP CONFIGURATION
SELECT OPTION
PREVIOUS
NOTE 1: The Airflow Settings will only be present if the
connected communicating control is configured for ECM
blower.
NOTE 2: If multiple units are connected to one thermostat,
refer to section 3.6 for unit selection.
AIRFLOW SELECTION
HEAT STAGE 1
HEAT STAGE 2
AUXILIARY HEAT
EMERGENCY HEAT
COOL STAGE 1
COOL STAGE 2
COOL DEHUMID 1
COOL DEHUMID 2
CONTINUOUS FAN
HEAT OFF DELAY
COOL OFF DELAY
PREVIOUS
SYSTEM CONFIGURATION
UNIT CONFIG
3.1
AIRFLOW SELECTION
Adjust the airflow settings for each system operating mode
using the up/down arrow buttons. Press the center button to
select each item.
• Airflow Settings (defaults stored in control)
- valid range: obtained from control (in 25 CFM
increments)
• Blower Off Delay (default 60 seconds) – valid
range: 0 to 255 seconds (in 5 second increments)
SAVE
CFM
600
750
850
850
525
700
425
550
350
60
30
NEXT
3.2
OPTION SELECTION
This option allows the configuration of heat pump options to
be modified.
Adjust the Option settings using the up/down arrow buttons.
Press the center button to select each item.
• Motorized Valve (defaults stored in control) –
valid range: Off, On “On” delays compressor start
until the valve is fully open.
NOTE: “Motorized Valve” used here refers to a two-position
motorized water valve, not to be confused with the modulating
motorized water valve found in the LOOP CONFIG.
• Compressor ASCD (Anti-Short Cycle Delay
(default stored in control) – valid range: 5 to 8
(in 1 minute increments)
NOTE 1: The Compressor Anti-Short Cycle Delay setting
provides equipment protection by forcing the compressor to
wait a few minutes before restarting.
NOTE 2: If multiple units are connected to one thermostat,
refer to section 3.6 for unit selection.
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ATC32U02 Thermostat Screens and Set Up
CAUTION!
CAUTION! This is a Commercial option only and does not
alter Residential unit operation.
OPTION SELECTION
MOTORIZED VALVE
OFF
COMPRESSOR ASCD
PREVIOUS
5
NEXT
3.3
UNIT CONFIGURATION
Adjust the Unit Configuration settings including Heat
Pump Family, Heat Pump Size, Blower Type, and Loop
Configuration using the up/down arrow buttons. Press the
center button to select each item.
• Heat Pump Family (default stored in control) –
valid range: TE, TY, TES, TEP, TRT, TSM
• Heat Pump Size (default stored in control) –
valid range: depends on Heat Pump Family setting
• Blower Type (default stored in control) – valid
range: NONE, PSC–2SPD, ECM, PSC–1SPD
• Loop Config (default stored in control) – valid
range: Other, VS PUMP, MOD VALVE
Can be configured for either single pumping or parallel
pumping.
Configure temperature differentials at the thermostat for
vFlow™ units with an internal flow control pump.
Adjust the Pump Configuration settings using the up/down
arrow buttons. Press the center button to select each item.
• Heating Delta T (default stored in control) –
valid range: 4 to 12ºF (in 1ºF increments)
• Cooling Delta T (default stored in control) –
valid range: 9 to 20ºF (in 1ºF increments)
Maximum Heat LWT (valid range based on specific model;
refer to model IOM). Minimum Cool LWT (valid range based
on specific model; refer to model IOM).
NOTE: Refer to section 3.6.3 for multi-unit configuration
instructions.
VARIABLE SPD INTERNAL
PUMP CONFIGURATION
LOOP OPTION
PUMP CONTROL
PARALLEL
DELTA T
Airflow, pump and valves can be configured from ‘System
Configuration’ screen.
HEATING DELTA T
COOLING DELTA T
7F
10 F
Select ‘VS PUMP’ when applying an internal variable speed
flow controller with other flow controllers on a single loop in
parallel.
MAXIMUM HEAT LWT
MINIMUM COOL LWT
80 F
40 F
NOTE: Refer to section 3.6.3 for multi-unit configuration
instructions.
UNIT CONFIGURATION
CURRENT CONFIG
TE026
HEAT PUMP FAMILY
TE
HEAT PUMP SIZE
026
BLOWER TYPE
58
3.4
PUMP CONFIGURATION
vFlow™ vs internal flow control pump can be controlled either
through temperature differential (Delta T) or can be set to
specific speed (fixed; % of full speed for each heat and cool
stage).
ECM
LOOP CONFIG
VS PUMP
SELECT OPTION
PREVIOUS
SAVE
PREVIOUS
SELECT
To control vs pump by fixed speed, select ‘Pump Control’,
press , use down arrow to select ‘Fixed’, and press to
save.
Default stored in control. Valid range: 15% - 90% (in 1%
increments)
Heating Stage 1
Cooling Stage 1
Heating Stage 2
Cooling Stage 2
If Loop Option is set to ‘PARALLEL’, valid range changes to
50-90% (in 1% increments).
Geothermal Heat Pump Systems
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ATC32U02 Thermostat Screens and Set Up
VARIABLE SPD INTERNAL
PUMP CONFIGURATION
LOOP OPTION
PUMP CONTROL
SINGLE
FIXED
HEATING STAGE 1
COOLING STAGE 2
60%
75%
COOLING STAGE 1
COOLING STAGE 2
50%
70%
PREVIOUS
SELECT
3.5
VALVE CONFIGURATION
Configure temperature differentials at the thermostat for
vFlow™ units with a motorized modulating valve.
Adjust the Valve Configuration settings using the up/down
arrow buttons. Press the center button to select each item.
• Heating Delta T (default stored in control) –
valid range: 4 to 12ºF (in 1ºF increments)
• Cooling Delta T (default stored in control) –
valid range: 9 to 20ºF (in 1ºF increments)
NOTE 1: Minimum and Maximum degree values are shown
only when the control is configured with the appropriate
values.
NOTE 2: Refer to section 3.6.3 for multi-unit configuration
instructions.
MODULATING VALVE
CONFIGURATION
OFF POSITION
0.0
VALVE CONTROL DELTA T
HEATING DELTA T
COOLING DELTA T
7F
10 F
MAXIMUM HEAT LWT
MINIMUM COOL LWT
80 F
40 F
PREVIOUS
SELECT
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ATC32U02 Thermostat Screens and Set Up
9.0 Service Mode
9.2
CONTROL DIAGNOSTICS
Control Diagnostics mode allows the service personnel to
view the status of all physical inputs, switches, temperature
sensor readings, as well as the operational status of the
pump at the thermostat.
SERVICE MODE
MANUAL OPERATION
CONTROL DIAGNOSTICS
Navigate between diagnostic screens using the left/right
arrow buttons.
DIPSWITCH CONFIG
FAULT HISTORY
NOTE 1: The Pump Status will not be present if the connected
communicating control (DXM2) is not configured for Pump
(section 3.3).
CLEAR FAULT HISTORY
SELECT OPTION
PREVIOUS
SELECT
9.1
MANUAL OPERATION
Manual Operation mode allows the service personnel to
manually command operation for any of the thermostat
outputs, blower speed, as well as pump speed or valve
position to help troubleshoot specific components.
NOTE 1: The ECM Airflow adjustment will not be present if the
connected communicating control (DXM2) is not configured for
ECM (section 3.3).
NOTE 2: The Pump Speed adjustment will not be present
if the connected communicating control (DXM2) is not
configured for Pump (section 3.3).
NOTE 3: The Valve Position adjustment will not be present if
the connected communicating control (DXM2) is configured for
Valve (section 3.1).
NOTE 4: If multiple units are connected to one thermostat,
refer to section 9.6
MANUAL OPERATING MODE
Y1
Y2
W
O
G
H
DH
ECM
PUMP
TEST
COMM OUTPUT
COMM OUTPUT
COMM OUTPUT
COMM OUTPUT
COMM OUTPUT
COMM OUTPUT
COMM OUTPUT
AIRFLOW
SPEED
MODE
SELECT OPTION
PREVIOUS
60
OFF
OFF
OFF
OFF
OFF
OFF
OFF
0
0%
OFF
NOTE 2: If multiple units are connected to one thermostat,
refer to section 9.6.
CONTROL DIAGNOSTICS - 1
LT1 TEMP
38.1
LT2 TEMP
79.9
COMP DISCHARGE
157.7
ENTERING WATER
78.5
LEAVING WATER
73.3
HOT WATER EWT
121.5
LEAVING AIR
75.1
LOOP PUMP SPD
60%
LOOP PUMP WATTS
140
LOOP FLOW GPM
7.4
ECM BLOWER RPM
550
ECM TARGET CFM
800
ECM BLOWER STATIC
0.5
PREVIOUS
NEXT
CONTROL DIAGNOSTICS - 2
HP SWITCH
LOC SWITCH
Y1 PHYSICAL INPUT
Y2 PHYSICAL INPUT
W PHYSICAL INPUT
O PHYSICAL INPUT
G PHYSICAL INPUT
H PHYSICAL INPUT
EMERG SHUTDOWN
NIGHT SETBACK
OVR INPUT
CONTROL VOLTAGE
PREVIOUS
SELECT
Geothermal Heat Pump Systems
CL
CL
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
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ATC32U02 Thermostat Screens and Set Up
9.3
DIPSWITCH CONFIGURATION
Dipswitch Configuration mode allows the service personnel
to view the status of all dipswitch settings for the connected
communicating control (DXM2/AXM) at the thermostat.
9.4
FAULT HISTORY
Fault History mode displays the five most recent stored fault
codes for the connected communicating control (DXM2).
Navigate between configuration screens using the left/right
arrow buttons.
Navigate between control fault codes using the up/down
arrow buttons. Press the center button to view more
information about the highlighted fault code.
NOTE 1: The unit control dipswitch settings cannot be
changed from the thermostat.
NOTE: If multiple units are connected to one thermostat, refer
to section 9.7.
NOTE 2: If multiple units are connected to one thermostat,
refer to section 9.6.
1
2
3
4
5
6
7
8
ON
ON
ON
ON
ON
ON
ON
ON
TT038 SN - - - - - 0 1 2 3
LAST 5 FAULTS
LT1 LOW WATER TEMP
CONTROL CONFIGURATION
DIPSWITCH S1
NO FAULT
UPS ENABLED
DUAL COMP STG 1
HEAT PUMP TSTAT
RV O THERMOSTAT
DEHUMID OFF
EH2 AUX HEAT
BOILERLESS
SEE DXM2 AOM
NO FAULT
NO FAULT
NO FAULT
PREVIOUS
NEXT
SELECT
FAULT CONDITION MENU
PREVIOUS
NEXT
CONTROL CONFIGURATION
DIPSWITCH S2
1
2
3
ON \ ACCESSORY 1
ON ACCESSORY 2
ON/
4
5
6
ON \ ACCESSORY 2
ON ACTIVE W/ COMP
ON /
7
8
ON H DEHUM INPUT
ON FACTORY SETTING
PREVIOUS
CONTROL CONFIGURATION
DIPSWITCH S3
1
2
3
4
ON
OFF
OFF
OFF
FACTORY SETTING
HWG TEST OFF
HWG SP 125
HWG DISABLED
JW3 LT1 SETTING WELL
PREVIOUS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
FAULT TEMP CONDITIONS
FAULT FLOW CONDITIONS
FAULT I/O CONDITIONS
FAULT CONFIG COND
FAULT POSSIBLE CAUSES
PREVIOUS
NEXT
SELECT
9.4.1 Temperature Conditions
Displays detailed temperature readings that were
recorded at the time the fault occurred.
NOTE: If multiple units are connected to one thermostat, refer
to section 9.6.
FAULT TEMPERATURE CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
LT1 TEMP
LT2 TEMP
HOT WATER EWT
COMP DISCHARGE
LEAVING AIR
LEAVING WATER
ENTERING WATER
CONTROL VOLTAGE
28.1
97.3
121.5
157.7
92.7
34.9
42.1
26.4
PREVIOUS
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ATC32U02 Thermostat Screens and Set Up
9.4.2 Flow Conditions
Displays detailed blower and pump speed / valve
position readings that were recorded at the time the
fault occurred.
NOTE: If multiple units are connected to one thermostat, refer
to section 9.7.
FAULT FLOW CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
9.4.5 Possible Causes
Possible causes as to why the fault occurred
NOTE: If multiple units are connected to one thermostat, refer
to section 9.7.
POSSIBLE FAULT CAUSES
LOW WATER COIL TEMP
LOW WATER TEMP - HTG
ECM TARGET CFM
800
LOW WATER FLOW - HTG
ECM BLOWER RPM
550
LOW REFRIG CHARGE - HTG
FLOW RATE GPM
6.5
INCORRECT LT1 SETTING
PUMP SPEED
60%
PUMP WATTS
140
LOOP CONFIG
PREVIOUS
VS PUMP
SINGLE
9.4.3 Input/Output Conditions
Displays the status of all physical and communicated
inputs, switches, and control outputs that were
recorded at the time the fault occurred.
BAD LT1 THERMISTOR
PREVIOUS
9.5
CLEAR FAULT HISTORY
Clear Fault History will clear all fault codes stored in the
thermostat as well as the fault history in any connected
communicating controls (DXM2/AXM).
NOTE: If multiple units are connected to one thermostat, refer
to section 9.7.
FAULT I / O CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
TSTAT
SAFETY
CONV COMM
HPS
Y1
Y1
LOC
Y2
Y2
CO
W
W
O
O
OUTPT
G
G
FAN
H
H
HWG
OVR
DH
PUMP
OUTPT
CC
RV
ACC1
ACC2
AL1
EH1
EH2
PREVIOUS
9.4.4 Configuration Conditions
Displays the status of all dipswitch settings that were
recorded at the time the fault occurred.
NOTE: If multiple units are connected to one thermostat, refer
to section 9.7.
FAULT CONFG CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
1
2
3
4
5
6
7
8
62
S1
S2
ON
1 ON
ON
2 ON
ON
3 ON
ON
4 ON
ON
5 ON
ON
6 ON
ON
7 ON
ON
8 ON
PREVIOUS
1
2
3
4
S3
ON
OFF
OFF
OFF
LT1
LT2
WELL
WELL
Geothermal Heat Pump Systems
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Notes:
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Revision History
Page #
Description
3 April, 2014
Various
Content Updated
15 Jan., 2014
36
‘Verifying DC Voltage on DXM2 Board for Mod Valve Check’ Diagram Corrected
6 Sept., 2013
All
First Printed
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AT P U M P S
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6
ISO 9001:2008
Certified
Quality: First & Always
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Oklahoma City, OK 73179
Phone: 405-745-6000
*97B0601N01*
Fax: 405-745-6058
climatemaster.com
97B0601N01
ClimateMaster works continually to improve its products. As a result, the design and specifications of each product at the time for order may be
changed without notice and may not be as described herein. Please contact ClimateMaster’s Customer Service Department at 1-405-745-6000
for specific information on the current design and specifications. Statements and other information contained herein are not express warranties and do not form the basis of any bargain between the parties, but are merely ClimateMaster’s opinion or commendation of its products.
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© ClimateMaster, Inc. 2013
64
Geothermal Heat Pump Systems
Rev.: 3 April, 2014