Rooftop Module (RTM - 1U48 Standard on all units) The Rooftop Module (RTM) responds to cooling, heating, and ventilation requests by energizing the proper unit com- ponents based on information received from other unit mod- ules, sensors, remote panels, and customer supplied bi- nary inputs. It initiates supply fan, exhaust fan, exhaust damper, inlet guide vane positioning or variable frequency drive output, and economizer operation based on that in- formation.
RTM Resistance Input vs Setpoint Temperatures
RTM cooling or | RTM cooling |
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heating | setpoint input |
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setpoint input | used as the | Resistance | |
used as the | source for | (Ohms) Max. | |
source for a | SUPPLY AIR | Tolerance 5% | |
ZONE temp | temp setpoint |
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setpoint (oF) | cooling (oF) |
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40 | 40 | 1084 |
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45 | 45 | 992 |
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50 | 50 | 899 |
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55 | 55 | 796 |
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60 | 60 | 695 |
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65 | 65 | 597 |
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70 | 70 | 500 |
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75 | 75 | 403 |
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80 | 80 | 305 |
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n/a | 85 | 208 |
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n/a | 90 | 111 |
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RTM Resistance Value vs System Operating Mode | |||
Resistance |
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applied to RTM |
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MODE input | Constant Volume Units |
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Terminals (Ohms) |
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Max. Tolerance | Fan | System |
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5% | Mode | Mode |
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2320 | Auto | Off |
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4870 | Auto | Cool |
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7680 | Auto | Auto |
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10770 | On | Off |
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13320 | On | Cool |
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16130 | On | Auto |
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19480 | Auto | Heat |
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27930 | On | Heat |
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Compressor Module (SCM & MCM - 1U49 standard on all units)
The Compressor module, (Single Circuit & Multiple Circuit), upon receiving a request for mechanical cooling, energizes the appropriate compressors and condenser fans. It moni- tors the compressor operation through feedback information it receives from various protection devices.
Human Interface Module (HI - 1U65 standard on all units)
The Human Interface module enables the operator to adjust the operating parameters for the unit using it's 16 key key- pad. The 2 line, 40 character LCD screen provides status information for the various unit functions as well as menus for the operator to set or modify the operating parameters.
Heat Module (1U50 used on heating units)
The Heat module, upon receiving a request for Heating, en- ergizes the appropriate heating stages or strokes the Modu- lating Heating valve as required.
General Information (Continued)
Ventilation Override Module (VOM - Optional 1U51) The Ventilation Override module initiates specified func- tions such as; space pressurization, exhaust, purge, purge with duct pressure control, and unit off when any one of the five (5) binary inputs to the module are activated. The com- pressors and condenser fans are disabled during the ven- tilation operation. If more than one ventilation sequence is activated, the one with the highest priority is initiated.
Interprocessor Communications Board (IPCB - Optional 1U55 used with the Optional Remote Human Interface)
The Interprocessor Communication Board expands commu- nications from the rooftop unit UCM network to a Remote Human Interface Panel. DIP switch settings on the IPCB module for this application should be; Switches 1 and 2 "Off", Switch 3 "On".
Trane Communications Interface Module (TCI - Optional 1U54 used on units with Trane ICSTM )
The Trane Communication Interface module expands com- munications from the unit UCM network to a Trane Tracer 100TM or a Tracer SummitTM system and allows external setpoint adjustment and monitoring of status and diagnos- tics. DIP Switch settings on the TCI
module for these applications should be:
Tracer 100 (Comm3): Switches 1, 2, and 3 are "Off";
Tracer Summit (Comm4): Switch 1 is "On", switches 2, and 3 are "Off"
Lontalk Communication Interface Module (LCI - Optional 1U54 - used on units with Trane ICSTM or 3rd party Build- ing AutomationSystems)
The LonTalk Communication Interface module expands communications from the unit UCM network to a Trane Tracer SummitTM or a 3rd party building automation system, utilizing LonTalk, and allows external setpoint and configu- ration adjustment and monitoring of status and diagnostics.
Exhaust/Comparative Enthalpy Module (ECEM - Optional 1U52 used on units with Statitrac and/or comparative enthalpy options)
The Exhaust/Comparative Enthalpy module receives infor- mation from the return air humidity sensor, the outside air humidity sensor, and the return air temperature sensor to utilize the lowest possible humidity level when considering economizer operation. In addition, it receives space pres- sure information which is used to maintain the space pres- sure to within the setpoint controlband. Refer to the table below for the Humidity vs Voltage input values.
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