VAV-SVX01C-EN 13
UCM 4.2 Installation and Wiring
Note: VariTrane and VariTrac cooling only Series D and E models consume 20 VA (12 VA for the
actuator and 8 VA for the UCM). The heating output ratings remain the same.
Refer to Figure 1, p. 8 for UCM terminal locations and Figure 2, p. 16 through Figure 5, p. 20 for
wiring of output devices.
Zone Sensor Wiring
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
WARNING
Electrocution and Fire Hazards with Improperly Installed and Grounded
Field Wiring!
Improperly installed and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid
these hazards, you MUST follow requirements for field wiring installation and grounding as
described in the National Electrical Codes (NEC) and your local/state electrical codes. All field
wiring MUST be performed by qualified personnel.
Failure to follow these requirements could result in death or serious injury.
Location and Mounting
A zone sensor in each control zone should be located in the most critical area of the zone. Sensors
should not be mounted in direct sunlight or in the area’s supply air stream. Subdivision of the zone
may be necessary for adequate control and comfort.
Avoid mounting zone sensors in areas subject to the following:
• Drafts or “dead spots” behind doors or corners
• Hot or cold air ducts
• Radiant heat from the sun or appliances
• Concealed pipes or chimneys
• Unheated or uncooled surfaces behind the sensor such as outside walls
• Air flows from adjacent zones or other units
Wiring
Each unit must be controlled by a zone sensor that is designated specifically for use with the UCM
control. Field wiring for the zone sensors must meet the following requirements:
• Must be 14 to 18 AWG
• Refer to the sensor instructions for terminal connections.
Fan Power Fan Output 6 VA
Hot Water Proportional 4 VA
Hot Water 2 Position 6.5 VA
Electric Heater Magnetic Contactor 10 VA
Electric Heater Mercury Contactor 12 VA
Table 4. VA rating for components (continued)
Style Volt Amps
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