Programmable Functions Q3 and Qht Controls for Chilled Water Systems
12 L-2962 ENGLISH
SUMMARY TABLE OF PROGRAMMABLE FUNCTIONS
FAULT AND ERROR MESSAGES
To protect the equipment, certain fault conditions trigger a shutdown, and the system will not restart until the fault is repaired.
If an operational failure occurs, the display will flash one of the following fault or error code messages. Fault code displays are
canceled by pressing the MODE button (Q3) or POWER button (Qht).
Table 4: Programmable Functions - Ranges and Factory Defaults
Function
Number Description Factory Default
Custom
Settings Function Range
1 Display Fahrenheit, Celsius, or
Auto
F F, C, or A (only with U-Board)
2 Bypass Valve Differential 12 (12/8 = 1.5°F [0.8°C]) 2 - 31
3 Fan Response Differential 8 (8/8 = 1°F [0.6°C]) 2 - 31
4 Low Fan Speed 38 2 - 57
5 High Fan Speed 85 41 - 99
6 Fan Mode C (Continuous) C (Continuous)
I (Intermittent)
7 Temperature Calibration -- Plus or minus 1%
8 Software Revision (current version) n/a
9 Product Software dE = Direct Expansion
CH = Chilled Water or
Modulating Air Handler
n/a
10 LCD or LED Segment Test Displays all LCD graphics or
LED segments
n/a
11 Sleep Mode
LCD backlight off or LEDs dim
On On = Continuous display
SL = Sleep Mode
12 Aux Heat Enable/Disable AH “- -” = Aux Heat Disabled
AH = Aux Heat Enabled
13 Humidity Sensor Limit 60 (%RH) 50 - 80 %RH
14 Air Filter Timing Setting
(x100 hours)
0 0 = Disabled
1 - 25 (100 - 2500 hours)
15 CAN Bus Unit ID 59 0 - 99
16 CAN Bus Group ID 58 0 - 99
17 Select FAMU (Fresh Air Make-
Up) Operation (future feature)
“- -” “- -” = Normal
FA = FAMU
18 Fan-Speed Divisions 5 3 = 3 speeds
5 = 5 speeds
19 Bypass Valve Override
(for bleeding air handler)
“- -” “- -” = Normal Operation
Ob = Override Bypass Valve
20 HU (Humidity) Pre-circulation 10 (minutes) 0 - 30 minutes
21 HU Dehumidification 30 (minutes) 10 - 60 minutes
22 HU Time Period 12 (hours) 2 - 16 hours
23 Custom Medium Fan Speeds 2 (only with U-Board) 2 or 5
24 Medium Low Fan Speed 50 (only with U-Board) 2 - 99
25 Medium Fan Speed 62 (only with U-Board) 2 - 99
26 Medium High Fan Speed 74 (only with U-Board) 2 - 99
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