Cxm controls – Comfort-Aire HBH Series 6-10 Tons User Manual

Page 27

Heat Controller, Inc.

HBH SERIES

IOM Manual

CXM Controls

Unit Performance Sentinel-UPS (patent pending): The

UPS feature indicates when the heat pump is operating

inefficiently. A UPS condition exists when:

In heating mode with compressor energized,

FP2 is greater than 125°F [52°C] for 30

continuous seconds, or:

In cooling mode with compressor energized,

FP1 is greater than 125°F [52°C] for 30

continuous seconds, or:

In 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:

The compressor is on in the cooling mode and

the FP1 sensor is colder than the FP2 sensor,

or:

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 flash Code 1 (when in test mode).

CXM Control Start-up Operation - The control will not

operate until all inputs and safety controls are checked for

normal conditions. The compressor will have a 5 minute anti-

short cycle delay at power-up. The first time after power-up

that there is a call for compressor, the compressor will follow

a 5 to 80 second random start delay. After the random start

delay and anti-short cycle delay, the compressor relay will be

energized. On all subsequent compressor calls, the random

start delay is omitted.