ClimateMaster Tranquility Digital DXM2 User manual

DIGITAL Geothermal

Heat Pumps

TE/TZ/TES/TEP

97B0601N01

Rev.: 3/10/15

Tranquility®Digital (DXM2)

Troubleshooting Guide

Table of Contents

Introduction 2

Troubleshooting Flow Chart 3-9

Flow Chart Reference Symbols and Diagrams 10

Contactor Chart 12

Verifying Pump Feedback Signal 12

Removing Powerhead on Modulating Valve 13-14

Checking Compressors 15-16

Reversing Valve Touch Test Chart 17

Performance Troubleshooting 17-18

Functional Troubleshooting 20-22

Typical Split Water-to-Air Troubleshooting Form 23

Typical Water Source Refrigeration Circuit 24

(Heating Cycle)

Unit Operating Conditions 25

Basic Refrigeration Summary 26

Refrigeration Troubleshooting 27-28

Auxiliary Heat Check 29

Checking Pump Output 29

Compressor Contactor Voltage Check 30

Check CCH for 24 Volts 30

Verifying Contactor 30

Verifying Capacitor 31

Checking Pump Power Cord 31

Replacing Variable-Speed Pump Power Head 32

Verifying Power at Molded Plug 32

for Compressor

Verifying Antifreeze 33

Second Stage Verication 34

Verifying 24V at Reversing Valve 35

Checking Reversing Valve at DXM2 35

A0-2 Jumper 36

Checking for Power at DXM2 36

Verifying DC Voltage on DXM2 Board 37

for Modulating Valve Check

TXV Bulb Test 38

Verifying Dipswitch Position 39

Replacing High Pressure Water Switch 39

Verifying a Thermistor 40-41

Turning Breaker on in Panel or Aux Heat Control 42

Static Pressure Check 42

Locating Tstat Version and DXM2 Version 43

UltraCheck EZ™Motor Diagnostic Tool 43

Checking Dipswitches on DXM2 44

Magnet Test to Shift Reversing Valve 44

Checking Blower Line Voltage 45

Modulating Valve Loses Conguration 45

Hard Reset of Thermostat 46

Units Having LT1 Lockouts In Heating 47

Electrical—Power Wiring 48

LT2 Sensor Location for Non-TAH Air Handlers 49

Air Coil Connection 49

Lineset Diameters and Charge Information 49

Connection to Non-Communicating thermostat and

AXM communicating control in TAH Air Handler 50

Connection to Non-Communicating thermostat

and non-communicating Air Handler/Furnace 50

Denitions of Conditions 51-52

DXM2 Board Layout and Dipswitches 53

AXM Board Layout and Dipswitches 54

DXM2 Controls 55-58

Typical Wiring Diagrams 59-61

ATC32U02 Thermostat Screens and Set Up 62-68

Revision History 72

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

2Geothermal Heating and Cooling

Troubleshooting ClimateMaster Tranquility®Digital Packaged Heat Pumps is quite straightforward.

Most problems relate to water ow. Either there isn’t enough water ow 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 rst 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

(ACDU02). You must have ATC32 or ACDU02 to properly work on ClimateMaster Tranquility® Digital units that use the DXM2

control board.

Follow the ow chart on the following pages to help diagnose and solve your issue.

Introduction

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

www.climatemaster.com

Troubleshooting Flow Chart

Did unit

start?

Check that unit

voltage reads:

197-254V

Does thermostat say

‘No Communication’?

The unit did

start but it

locked out

Establish power

Check that the

compressor is not in a

thermal overload

Check Fault Code

from thermostat

or service tool

No Yes

Verify that

Dipswitch 1

on S3

is in ‘On’

position

Is there power

to DXM2 24V?

(18-31.5V)

A-W

A-Z

Fault

See Fault Codes

and Possible

Causes

A-F

Check that there

are 24 volts at CC on

DXM2 board and a call

for heating or cooling

A-K

Check for 24V at

contactor

18-31.5 volts

A-M

Replace the

DXM2 Board

Check and possibly

replace wiring

Yes Yes

Yes

No A-A

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.

Replace board if

current board still

does not function

Disconnect and

reconnect the

wires from the

DXM2. This

will reset the

thermostat.

Verify that

the DXM2’s

dipswitches

are set

properly.

Is the unit

properly

congured?

See Section

3.0 on page

56.

B-G

Hard

reset the

thermostat

B-K

Hook Service Tool up to

board. Does Service Tool

communicate with board?

Also ensure there

are no wire nuts;

solder wires if

they need to be

extended.

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

4Geothermal Heating and Cooling

See Section 3.2

on page 56.

Troubleshooting Flow Chart

My unit has

a Modulating

Valve. Is valve

opening?

Is the valve having

trouble shutting

completely and/or

is the unit

locking out?

Continued

Yes

Check

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.

Valve opens or

closes correctly

Yes

Verify A0-2

jumper is in

10V position.

A-V

Be sure unit

is congured

for Modulating

Valve.

Verify Valve and

powerhead

alignment

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.

Third notch aimed down in

unit position.

Then reattach powerhead.

A-C

Replace pump

power head

Is there voltage

to the pump?

(197-254V)

A-O

The unit starts

but the pump

does not

Check that the

A0-2 jumper on

DXM2 board is in

PWM position

Yes

A-V

Yes

Replace

wire harness

Yes

A-P

Check DC Voltage

at DXM2 Board

A0-2-Ground = .5-10 VDC

Is voltage in this range?

Does the low

voltage wiring

have a broken

wire?

Check DC Voltage

at DXM2 Board

T1-Ground = 3-4 VDC

(Pump off)

0-2 VDC

(Pump on)

Is voltage in this range?

Replace

DXM2 board

A-J

Yes

Verify how the units are

congured in the thermostat

(refer to ‘Section 3.3 - Unit

Conguration’ on page 53).

Be sure unit is congured 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

congured for ‘Variable Speed

Pump Parallel.’

B-L

Pump may be

locked. Pull

pump motor.

Can you free

impeller?

Replace pump

motor

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

www.climatemaster.com

Yes

Replace wire

harness

Continued

Troubleshooting Flow Chart

Verify in

conguration

that the unit

is congured

correctly for ECM

Yes

Check continuity on

communicating harness

from DXM2 to Module.

Is there a broken wire?

Is 197-254V at the

blower motor?

Check the wire

harness and

replace if needed

Replace

defective part

Does blower

turn on?

Verify that

the wiring on

the valve and

DXM2 Board

are correct.

See wiring

diagrams on

pages 53-54.

Valve does

function but

when the unit

shuts off, the

valve remains

open.

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.

Verify 3/4” Valve Dipswitch

or 1” Valve Dial

A-X

A-C

Yes

B-I

The unit uses

a modulating

valve but the

thermostat

continues

to show a

variable-

speed pump.

Connect a piece of thermostat wire

between T1 and GND on DXM2 so the

DXM2 board sees no feedback.

B-J

Check DC voltage on

DXM2 on packaged

or AXM on split with

communicating harness

to blower connected 12V–

GND should read 9–15V

Does the motor try to spin

when giving a ‘G’ call?

Use Emerson EZ Tool to

troubleshoot motor and

verify motor or module

B-F

B-M

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

6Geothermal Heating and Cooling

Replace

defective

wiring

Verify that

Dipswitch 1:4

is on

Call for

cooling

Unit starts but

does not shift

to cooling

Continued

Verify that

you have

cooling

call at

thermostat

Yes

Check

reversing valve

connection at

DXM2. Do you

have 24 VAC?

Yes

A-U

Verify

24V at

reversing

valve

Yes Replace

solenoid on

reversing valve

Yes

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.

A-T

B-H Verify RV

operation

Replace the reversing valve if

it still does not shift

If Dipswitch 1:4

is on, replace

board

A-E

Troubleshooting Flow Chart

There are

no faults,

but does the

compressor

start?

Verify comp contactor.

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

Replace capacitor.

Yes Verify voltage to

compressor at

molded plug

Replace molded

plug and wire

harness

A-Q

Turn power off and

remove molded plug on

compressor. Measure

resistance between C-S

and C-R.

Replace compressor

A-D

Yes

A-A

Yes

Is the

blower loud?

Check your

model’s airow

conguration.

See Section 3.1

on page 56.

Check static

pressure

B-D

Verify that

all grilles

and registers

are open.

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

www.climatemaster.com

Verify whether

the thermostat

is congured

for multi-stage

operation

Unit does

not seem to

be in second

stage. This is

indicated by the

performance

check being

about 30%

(low).

Verify that

you have

second

stage call

Does

DXM2

CCH have

24V?

Verify that

Dipswitch

1:4 is on

A-L

Yes Yes Yes Does the rectier

plug on the side

of the compressor

have 15-27 VDC?

Replace the

rectier plug

With unit running in second

stage, check amp draw

of comp. Next, remove

rectier plug. Amps should

be lower after removing

plug. Reattach plug and

verify that amps return to

previous higher reading.

Yes

A-S

Replace

compressor

Continued

The unit started

but runs and

loop temp

continue to drop

in the heating

mode

Yes

Verify the antifreeze

level where applicable.

Remember that EWT

below 45° needs 15° or

lower freeze protection.

Verify with appropriate

hydrometer.

A-R

Yes

Antifreeze has

been veried

as having 15°

or lower 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?)

Is the loop turbulent?

Min 2500 Reynolds

Number.

Yes

Use Pressure Drop

Software to verify

If Dipswitch 1:4

is on, replace

board

Troubleshooting Flow Chart

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

8Geothermal Heating and Cooling

Continued

Congure

See Lockout

Faults on page

51 under ‘Fault

Codes’

Is there more

than one unit

sharing a

common loop?

Properly congure

unit. See Section 3.3

and Section 3.4 on

page 57.

Does this unit

have a Variable

Speed Pump and

is it congured for

parallel pumping?

Yes Yes Yes

Is the thermostat

congured for the proper

model of the unit?

(Example: TZ036) This is

found on thermostat’s unit

conguration menu.

Yes 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.

Verify pump is

supplying enough ow

using Pressure Drop

Software. Closed loop

2.25 - 3.0 gpm per ton.

Replace with

correct motor

The unit

periodically

locks out on LT1

in heating or

high pressure in

cooling

ATC Thermostat

says ‘ECM

Conguration

Error’

The unit does

run but ATC

Thermostat

says ‘Service

Needed’

Yes

Troubleshooting Flow Chart

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

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

www.climatemaster.com

Replace

DXM2 or AXM

Unit runs but

does not satisfy

Yes Yes

The unit is running.

However, there is

a load issue. The

home is losing or

gaining more than

the capacity of the

heat pump.

If water ow and airow are good,

then verify refrigerant charge.

Calculate superheat and subcooling.

A-H

Troubleshooting Flow Chart

Continued

The unit runs

but auxiliary

heat is not

working

Yes Is the thermostat

calling for

auxiliary heat or

emergency heat?

Verify that

conguration is set

to auxiliary heat in

thermostat. See

section 2.2.2 on

page 55.

Does unit have

197-254V at

auxiliary heat

strip?

Turn breaker

on in panel or

in auxiliary heat

control

B-C

Yes Yes

Replace

wire harness

Does the heat

strip control

board have the

same 24 VDC as

the DXM2?

Yes

Replace heat

strap board

Yes

Verify the Water Side

Performance

HE = Heat Extraction in

BTUs (Heating)

HR = Heat Rejection in

BTUs (Cooling)

Calculate using the formula

found on A-G.

Check with performance

data. Is unit within 10%?

A-G

Verify load using a

manual J program.

You may also need to

perform a blower door

test for true inltration

and thermal imaging

for locating heat loss.

Also consider a duct

blast to verify that

air is being delivered

properly.

Yes

Adjust charge if needed to proper

superheat and subcooling ranges.

Then check for proper TXV operation

before adding or removing charge.

A-Y

Does DXM2 or

AXM (splits) have

24 VDC at EH1

and/or EH2?

A-I

Tranquility®

Digital (DXM2)—Troubleshooting Guide

Rev.: 10 March, 2015

10 Geothermal Heating and Cooling

Notes: Specific to Splits

1. When using TES/TEP with communicating Air Handlers

(and not using ATC32U02 Thermostat using a 24 volt

stat) you must mount stat at Air Handler or unit. For

proper communicating between TES/

TEP, an Air Handler, ATC32U02 should be

placed in the OFF position when not using

it as a service tool.

2. When conguring TES or TEP after a board change

be sure of correct blower type. Select NONE on tool or

thermostat because there is no blower directly connected

to the DXM2.

3. TAH Air Handlers can be changed to operate blower on

115 volts instead of 230 volts. Be sure NOT

to connect the supplied jumper to other

opp. molex plug unless you truly want 115

volts.

4. When installing LT2 Sensor on cased coil or other manu-

facturer Air Handler, be sure it is installed between TXV

and distributor tubes. If you can not install

the sensor in that location then do not in-

stall the sensor any where else on the coil

and leave jumper on DXM2 board.

5. Ensure that TXV bulb is strapped outside of

the Air Handler or Cased Coil on the suction

line and that the TXV bulb is insulated.

6. All TES/TEP units come factory charged for an additional

25 feet of lineset. Be sure to add or subtract from this

based on your lineset length. Final verica-

tion is looking at superheat and subcooling

numbers against operating parameters in

IOM.

7. On AXM in TAH Air Handler, the only dipswitch used is

#2, which can be used for dehumidication. On the AXM,

“ON” is Normal and “OFF” is Dehumidication.

8. When brazing a lineset, use Nitrogen ow to prevent

oxidation and carbon build up, because these things can

restrict the TXVs. Also, protect service valves with a wet

rag or heat block to prevent overheating and causing

damage. Always install a biow lter drier in lineset.

9. For reference connecting low voltage wiring

when using other Air Handlers or gas

furnace in duel fuel applications, see B-S.

B-R

B-N

B-O

B-P

B-Q

B-S

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