ClimateMaster DC Series Installation Manual download pdf (Page 32)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

CXM Controls

Safety Features – CXM Control

The safety features below are provided to protect the

compressor, heat exchangers, wiring and other components

from damage caused by operation outside of design

conditions.

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 random start upon

power up of 5-80 seconds.

Fault Retry: In Fault Retry mode, the Status LED begins

slowly ﬂ ashing to signal that the control is trying to recover

from a fault input. The control will stage off the outputs and

then “try again” to satisfy the thermostat input call. Once the

thermostat input call is satisﬁ ed, the control will continue on

as if no fault occurred. If 3 consecutive faults occur without

satisfying the thermostat input call, the control will go into

“lockout” mode. The last fault causing the lockout will be

stored in memory and can be viewed by going into test mode.

Note: FP1/FP2 faults are factory set at only one try.

Lockout: In lockout mode, the status LED will begin fast

ﬂ ashing. The compressor relay is turned off immediately.

Lockout mode can be “soft” reset by turning off the

thermostat (or satisfying the call). A “soft” reset keeps

the fault in memory but resets the control. A “hard” reset

(disconnecting power to the control) resets the control and

erases fault memory.

Lockout with emergency heat: While in lockout mode, if W

becomes active (CXM), emergency heat mode will occur.

High pressure switch: When the high pressure switch opens due

to high refrigerant pressures, the compressor relay is de-energized

immediately since the high pressure switch is in series with the

compressor contactor coil. The high pressure fault recognition is

immediate (does not delay for 30 continuous seconds before de-

energizing the compressor).

High pressure lockout code = 2

Example: 2 quick ﬂ ashes, 10 sec pause, 2 quick ﬂ ashes, 10

sec. pause, etc.

Low pressure switch: The low pressure switch must be open

and remain open for 30 continuous seconds during “on” cycle

to be recognized as a low pressure fault. If the low pressure

switch is open for 30 seconds prior to compressor power up it

will be considered a low pressure (loss of charge) fault. The low

pressure switch input is bypassed for the initial 60 seconds of a

compressor run cycle.

Low pressure lockout code = 3

Water coil low temperature (FP1): The FP1 thermistor

temperature must be below the selected low temperature limit

setting for 30 continuous seconds during a compressor run

cycle to be recognized as a FP1 fault. The FP1 input is bypassed

for the initial 60 seconds of a compressor run cycle. FP1 is set at

the factory for one try. Therefore, the control will go into lockout

mode once the FP1 fault has occurred.

FP1 lockout code = 4

Air coil low temperature (FP2): The FP2 thermistor temperature

must be below the selected low temperature limit setting for

30 continuous seconds during a compressor run cycle to be

recognized as a FP2 fault. The FP2 input is bypassed for the

initial 60 seconds of a compressor run cycle. FP2 is set at the

factory for one try. Therefore, the control will go into lockout

mode once the FP2 fault has occurred.

FP2 lockout code = 5

Condensate overﬂ ow: The condensate overﬂ ow sensor

must sense overﬂ ow level for 30 continuous seconds to

be recognized as a CO fault. Condensate overﬂ ow will be

monitored at all times.

CO lockout code = 6

Over/under voltage shutdown: An over/under voltage

condition exists when the control voltage is outside the range

of 19VAC to 30VAC. Over/under voltage shut down is a

self-resetting safety. If the voltage comes back within range

for at least 0.5 seconds, normal operation is restored. This is

not considered a fault or lockout. If the CXM is in over/under

voltage shutdown for 15 minutes, the alarm relay will close.

Over/under voltage shut down code = 7

Unit Performance Sentinel-UPS (patent pending): The UPS

feature indicates when the heat pump is operating inefﬁ ciently.

A UPS condition exists when:

a) In heating mode with compressor energized, FP2 is

greater than 125°F [52°C] for 30 continuous seconds, or:

b) In cooling mode with compressor energized, FP1 is

greater than 125°F [52°C] for 30 continuous seconds, or:

c) I

n cooling mode with compressor energized, FP2 is less

than 40°F [4.5°C] 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. Outputs of the control, excluding 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.

UPS warning code = 8

Swapped FP1/FP2 thermistors: During test mode, the control

monitors to see if the FP1 and FP2 thermistors are in the

appropriate places. If the control is in test mode, the control

will lockout, with code 9, after 30 seconds if:

a) The compressor is on in the cooling mode and the FP1

sensor is colder than the FP2 sensor, or:

b) The compressor is on in the heating mode and the FP2

sensor is colder than the FP1 sensor.

Swapped FP1/FP2 thermistor code = 9.

Diagnostic Features

The LED on the CXM board advises the technician of the

current status of the CXM control. The LED can display either

the current CXM mode or the last fault in memory if in test

mode. If there is no fault in memory, the LED will ﬂ ash Code 1

(when in test mode).

Section 10 - Packaged IOM 32 4/24/09 3:16:53 PM

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ClimateMaster DC Series Installation Manual Page 32

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