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McQuay IM 743 Operation & Maintenance

McQuay IM 743
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Page 8 of 32 OM 750
Table 6. LUI Menu Item List (Continued)
Economizer Enable Set economizer status: 0 = disable, 1 = enable. RW x 1
Economizer OA Temp Setpoint ETS Adjust economizer OA temperature setpoint. RW x 68
O
F (20
O
C)
Economizer IA/OA Temp Differential ETD Adjust economizer IA/OA temperature differential. RW x 2
O
F (1
O
C)
Adjust economizer IA/OA temperature differential. This variable is
Economizer Compare Differential ECD identical to Economizer IA/OA Temp Differential and therefore need RW x 0
O
F (0
O
C)
not be used (do not change).
Economizer OA Enthalpy Setpoint EES Adjust economizer OA enthalpy setpoint. RW x
25 btu/lb
(58 kJ/kg)
Economizer IA/OA Enthalpy Differential EED Adjust economizer IA/OA enthalpy differential. RW x
1 btu/lb
(3 kJ/kg)
Space Humidity Output ERH Display room humidity (optional). RO x
Space Humidity Setpoint RHS Adjust room humidity setpoint, for active dehumidification (optional). RW x 60%
Outdoor Air Humidity Output EORH Display OA humidity (optional). RO x
Outdoor Air Temp Output EOAT Display OA temperature. RO x
Emergency Heat Enable Set emergency heat status: 0 = disable, 1 = enable. RW x 1
Emergency Heat Setpoint EHS Adjust emergency heat setpoint. RW x 54
O
F (12
O
C)
Emergency Heat Shutdown
Set emergency heat operation during shutdown,
0 = no emergency heat during shutdown: RW x 0
Configuration
1 = allow emergency heat during shutdown.
External BI-1 Configuration
Set the function of external binary input 1: 0 = unoccupied,
RW x 0
1 = dewpoint/humidity switch.
External BI-3 Configuration
Set the function of external binary Input 3: 0 = ventilation lockout,
RW x 0
1 = exhaust interlock.
Fan Cycling Configuration
Set if IAF cycles (switches off) during occupied, bypass, and
RW x 2
standby mode: 2 = no cycling, 3 = cycle IAF.
Filter Alarm Enable Set filter alarm status: 0 = disable, 1 = enable. RW x 0
Reset Filter Alarm Input
Enter 1 to clear filter alarm. You must go back and enter a 0 value
RW x
after entering a 1 to re-enable the filter alarm.
Compressor Enable Set compressor status: 0 = disable, 1 = enable. RW x 1
Compressor Cooling Lockout Setpoint CCLO
Adjust compressor cooling lockout setpoint. When the OA tempera-
RW x 61
O
F (16
O
C)
ture falls below this setpoint compressor cooling is not allowed.
Adjust compressor start delay. This setpoint should be changed
Compressor Start Delay for every UVC to prevent many compressors from energizing at the RW x 0 sec
same time after a power failure or occupancy change.
LUI Temperature Units Set LUI temperature display units in degrees F or degrees C. RW x F
If a menu item value is greater than 2-digits (higher than 99), then
will be displayed by the LUI.
RW = read and write capable, RO = read only. (All RO values displayed are snapshots and are not dynamically updated as the value is displayed.)
Additional UVC field configuration is required if the dewpoint/humidity binary input is used, consult the factory.
Two Digit
Display LUI Menu Item List Abr. Description 04 Default

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McQuay IM 743 Specifications

General IconGeneral
BrandMcQuay
ModelIM 743
CategoryController
LanguageEnglish

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