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Comfort-Aire HBH Series 1/2 to 5 Ton User Manual

Page 29

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Heat Controller, Inc.

HBH/V COMPACT

IOM Instructions

CXM Controls

b) In cooling mode with compressor energized, FP1 is

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

or:

c) 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:

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.

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.

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