ClimateMaster Tranquility User manual

Residential Packaged

DIGITAL Geothermal

Heat Pumps

97B0601N01

Rev.: 01/15/14

Tranquility®Digital (DXM2)

Troubleshooting Guide

Table of Contents

Introduction 2

Troubleshooting Flow Chart 3-9

Flow Chart Reference Symbols and Diagrams 10

Contactor Chart 11

Verifying Pump Feedback Signal 11

Removing Powerhead on Modulating Valve 12-13

Checking Compressors 14-15

Reversing Valve Touch Test Chart 16

Performance Troubleshooting 17-18

Functional Troubleshooting 19-21

Commissioning Worksheet: 22-23

Typical Water Source Refrigeration Circuit 24

(Heating Cycle)

Basic Refrigeration Summary 25

Refrigeration Troubleshooting 26-27

Auxiliary Heat Check 28

Checking Pump Output 28

Compressor Contactor Voltage Check 29

Check CCH for 24 Volts 29

Verifying Contactor 29

Verifying Capacitor 30

Checking Pump Power Cord 30

Replacing Variable-Speed Pump Power Head31

Verifying Power at Molded Plug 31

for Compressor

Verifying Antifreeze 32

Second Stage Veriﬁcation 33

Verifying 24V at Reversing Valve 34

Checking Reversing Valve at DXM2 34

A0-2 Jumper 35

Checking for Power at DXM2 35

Verifying DC Voltage on DXM2 Board 36

for Modulating Valve Check

TXV Bulb Test 37

Verifying Dipswitch Position 38

Replacing High Pressure Water Switch 38

Verifying a Thermistor 39-40

Turning Breaker on in Panel 41

or Aux Heat Control

Static Pressure Check 41

Locating Tstat Version and DXM2 Version 42

UltraCheck EZ™Motor Diagnostic Tool 42

Checking Dipswitches on DXM2 43

Magnet Test to Shift Reversing Valve 43

Checking Blower Line Voltage 44

Modulating Valve Loses Conﬁguration 44

Hard Reset at Thermostat 45

Deﬁnitions of Conditions 46-47

DXM2 Board Layout and Dipswitches 48

DXM2 Controls 49-52

Wiring Diagrams 53-54

ATC Thermostat Screens and Set Up 55-61

Revision History 62

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

2Geothermal Heat Pump Systems

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.

Introduction

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

Troubleshooting Flow Chart

Did unit

start?

Check power

(208-240V)

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 No

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

A-A

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

conﬁgured? See

Section 3.0 on

page 56.

B-G

If it is still not

communicating,

check the

thermostat wire

(Be sure it is

not running

along power

wire). Ensure all

wiring is landed

properly on

both DXM2 and

thermostat.

May need to hard

reset thermostat.

B-K

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

4Geothermal Heat Pump Systems

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 conﬁgured

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 power

to the pump?

(208-240V)

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

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.’

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

Use Emerson EZ

Tool to troubleshoot

motor and verify

motor or module

Yes

Replace wire

harness

Continued

Troubleshooting Flow Chart

Verify in

conﬁguration

that the unit

is conﬁgured

correctly for ECM

Yes Yes

Check the

communicating harness

from DXM2 to Module.

Is there a broken wire?

Is 208-240V 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 on 3/4” Valve Dipswitch

and 1” Valve Dial

A-X

A-C

Yes

B-F

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 C on DXM2 so the

DXM2 board sees no feedback.

B-J

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

6Geothermal Heat Pump Systems

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 volts?

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. After a few

minutes, energize the valve. If

it still doesn’t shift, try a strong

magnet to pull over internal

slide while energizing.

A-T

B-H

B-H Verify RV

operation

Replace the reversing valve if

it still does not shift

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 power 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 airﬂow

conﬁguration.

See Section 3.1

on page 56.

Check static

pressure

B-D

Verify that

all grilles

and registers

are open.

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

Verify whether

the thermostat

is conﬁgured

for multi-stage

operation

Unit does not

seem to be

in the second

stage. This is

indicated by the

performance

check being

about 30% off

(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 rectiﬁer

plug on the side

of the compressor

(15-27 VDC) have

24 volts?

Replace the

rectiﬁer plug

For amp draw, check

with unit running and

then check amp draw

of comp. Next, remove

rectiﬁer plug. Amps

should be lower after

you remove plug. After

you reattach plug, amps

should go back up.

Yes

A-S

Replace

compressor

Continued

The unit started

but runs and

loop temp keep

dropping in the

heating mode

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?)

Is the loop turbulent?

Min 2500 Reynolds

Number.

Yes

Replace

board

Use Pressure Drop

Software to verify

Troubleshooting Flow Chart

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

8Geothermal Heat Pump Systems

Continued

Conﬁgure

See Lockout

Faults on page

51 under ‘Fault

Codes’

Is there more

than one unit

sharing a

common loop?

Properly conﬁgure

unit. See Section 3.3

and Section 3.4 on

page 57.

Does this unit

have a Variable

Speed Pump and

is it conﬁgured for

parallel pumping?

Yes Yes Yes

Is the thermostat

conﬁgured for the proper

model of the unit?

(Example: TZ036) This is

found on thermostat’s unit

conﬁguration 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 ﬂow

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

Conﬁguration

Error’

The unit does

run but ATC

Thermostat

says ‘Service

Needed’

Yes

Troubleshooting Flow Chart

This is the Unit

Performance Sentinel

causes in cooling mode

if LT2 is less than 40° or

LT1 is 125° or greater. In

heating mode if LT2 is 125°

or greater.

Go to Faults

Code 8.

A-F

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

Replace

DXM2

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 ﬂow and airﬂow 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

conﬁguration is set

to auxiliary heat in

thermostat. See

section 2.2.2 on

page 55.

Does unit have

208-240V at

auxiliary heat

strip?

Turn breaker

on in panel or

in auxiliary heat

control

B-C

Does DXM2

have 24 VDC

at EH1 and/or

EH2?

Yes Yes

A-I

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 inﬁltration

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

Troubleshooting Guide -

Tranquility®

Digital (DXM2) Packaged Units

Rev.: 01/15/14

10 Geothermal Heat Pump Systems

Reference Symbols and Diagrams

for Flow Chart

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