VariTrac CCP III Optional Relay Board Wiring

Issue:

VariTrac CCP III Optional Relay Board Wiring

Resolution:

Output Wiring (see next resolution for auxiliary output wiring)

 

Use only copper conductors for output wiring. The recommended wire size is 16-22 AWG. Do not run output wires in the same conduit or wire bundle with any AC power wires other than VariTrac Central Control Panel 24 V ac power.

 

Output wires should enter the cabinet through the conduit entry holes shown in Figure 3. Output wiring connections at the VariTrac Central Control Panel are shown in Figure 7.

 

The wire from the air conditioning unit to the CCP consists of one wire from each stage of heating, cooling, the supply fan, and the leg of the 24 Vac power source at the air conditioning unit. 24 Vac power single transformer systems terminate power at Rh and Rc (TB1-1 and TB1-2). Two transformer systems terminate the heating transformer at Rh (TB1-2) and the cooling transformer at Rc (TB1-1). The remaining wires are terminated per the diagram in Figure 7.

 

Binary output relay contacts are rated at 24 Vac, 1 amp 24 VA pilot duty.

 

IMPORTANT

 

All output wiring must comply with applicable electrical codes. Metal conduit may be required by local codes.

 

IMPORTANT

 

Output wires run in the same conduit or wire bundle with any AC power wires other than VariTrac Central Control Panel 24 Vac power could cause the VariTrac Central Control Panel to malfunction due to electrical noise.

From VAV-SVN03A-EN

 

Mechanical Specifications - Variable Air Volume Changeover/Bypass Units

 

Relay Board  

A. Program options:  Each central control panel is individually configurable as either an air conditioner controller or heat pump controller for a VariTrac system.

 

B. Outputs:  Binary outputs (optional relay board) contacts rated at 0.5 A, 30 VAC, 12 VA pilot duty.

 

C. Inputs:  Binary inputs are provided for occupied/unoccupied and priority shutdown.  Each input requires, should the function be desired, an isolated, ungrounded, remote contact.  The contacts must be capable of passing 15 mA of DC current.

 

 The systems sixth binary output can be configured to disable outside air ventilation during the unoccupied mode, to reflect the system heat/cool status, or to be controlled by an ICS system.

 

 

Notes:

 

You can use Varitrac Software and go to the Panel Setup menu. Under the Field Service menu you can place the CCP in a manual mode and energize or deenergize each relay.

You can use the dip switches on the CCP to test the relay boar. 

Turn S2-8 On puts it into a test mode and then S3 switches 1 through 6 control each relay.

 

Changes:

 

Other Question/Problem/Cause Statements:

• CCP Optional Relay Board Wiring
• Wiring for Auxiliary Output
• Binary output wiring for CCP optional relay board
• How do the terminations work on the CCP optional relay board?
• How do I test the relay board on the CCP?

Facts:

• VariTrac III Central Control Panel (CCP)

Original wave: wave1973