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724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 35
Chapter 2: Installation
2.9.3.2 Glycol-Cooled Systems (CRDX-G-FS-12KW, CRDX-G-FS-24KW)
Glycol-cooled systems equipped with a pump package require field wiring between the A/C unit and the pump package (see
Figure 2-13). The installer must wire two control conductors from the terminal board within the A/C unit, to the pump package
electrical box. Refer to the electrical drawings supplied with your unit for the number of field wires needed and for the
appropriate wire terminations required for your system.
Figure 2-13. Interconnecting field wiring glycol systems.
2.9.3.3 Remote Condenser (CRDX-A-FS-12KW, CRDX-A-FS-24KW)
For systems equipped with a remote condenser, the installer must provide main power wiring to the main power distribution
block located within the remote condenser electric box. A separate equipment ground lug is provided within the electrical box for
termination of the earth ground wire. Refer to the electrical drawing supplied with your unit and the wiring diagram supplied with
the condenser (typically located in the condenser electric box).
Control wires are not required between the remote condenser and the A/C system (see Figure 2-14). As an option, control wiring
may be installed between the A/C system and the condenser for the system controller to enable condenser operation only when
the compressor is running. You must remove the jumper from the remote condenser terminal board (see the condenser wiring
diagram). Wire 24-VAC control conductors from the terminal board within the A/C unit to the remote condenser terminal board.
If control wires aren’t installed (and the jumper remains in place), the condenser is always enabled and will turn on and off based
on the condenser’s pressure control settings. Refer to the electrical drawing for the correct number of field wires needed and for
the appropriate wire terminations required for your system.