Unit installation

Controls
66 SCXF-SVX01K-EN
Compressor Module (MCM) - Standard on
all Units
The compressor module, (single circuit and multiple
circuit) energizes the appropriate compressors and
condenser fans upon receiving a request for mechanical
cooling. It monitors the compressor operation through
feedback information it receives from various protection
devices.
Human Interface Module - Standard on all
Units
The human interface (HI) module enables the operator to
adjust the operating parameters for the unit using it's 16-
key keypad on the human interface panel.The HI panel
provides a two line, 40 character, clear language (English,
Spanish, or French) LCD screen with unit status
information and menus to set or modify operating
parameters. It is mounted in the unit’s main control panel
and accessible through the unit’s control panel door.
Remote Human Interface Module Option
The optional remote-mount human interface (RHI) panel
has all the functions of the unit-mounted version except
for service mode.To use a RHI, the unit must be equipped
with an optional interprocessor communications bridge
(IPCB). Model number digit 32 (=2) indicates if the ICPB
was ordered with the unit. If not, contact your localTrane
representative to order an ICPB kit for field installation.
The RHI can be located up to 1,000 feet (304.8 m) from the
unit. A single RHI can monitor and control up to four self-
contained units if each one contains an IPCB.The IPCB
switches must be set as SW1- off, SW2 - off, and SW3 - on.
Interprocessor Communications Board •
Option used with RHI
The interprocessor communication board expands
communications from the rooftop unit's UCM network to
a remote human interface panel. DIP switch settings on the
IPCB module for this application are; switches 1 and 2 “off,”
switch 3 “on.”
Waterside Module - Standard on all water-
cooled units
The waterside module (WSM) controls all water valves
based on unit configuration. In addition, the WSM
monitors waterflow proving and the following
temperatures:
• entering water
• entering air low
• mixed air
• entering condenser water
• refrigerant circuit 3:
• saturated
condenser
• evaporator frost
• refrigerant circuit 4:
• condenser
• evaporator
Cooling Tower Interlock
To interlock condenser pump/tower with cooling
operation, wire the cooling tower to an external 115 volt
control power source, to ground, and to control terminal
block. Normally open/closed contacts are provided.
Heat Module
The heat module is standard on all units with factory-
installed heat. It controls the unit heater to stage up and
down to bring the temperature in the controlled space to
within the applicable heating setpoint. Also, it includes a
freezestat, morning warmup, and heating outputs.
Ventilation Override Module (VOM) Option
The ventilation override module can be field-configured
with up to five different override sequences for ventilation
override control purpose. When any one of the module’s
five binary inputs are activated, it will initiate specified
50 50 899
55 55 796
60 60 695
65 65 597
70 70 500
75 75 403
80 80 305
NA 85 208
NA 90 111
Table 42. RTM resistance value vs. system operating
mode
Resistance applied to
RTM mode input
terminals, ohms
CV units VAV units
fan mode
system
mode
system
mode
2320 auto off off
4870 auto cool
7680 auto auto auto
10,770 on off
13,320 on cool
16,130 on auto
19,480 auto heat
27,930 on heat
Note: Mode boundaries are 1000 to 40,000 ohms. Other boundaries are
equal to the midpoint between the nominal mode resistance.
Table 41. RTM setpoint analog inputs
Cooling or Heating
Setpoint Input, °F
(using RTM as zone
temp. source) ohms
Cooling Setpoint Input, °F
(using RTM as supply air temp.
source) resistance,
V