Microtek MHP1-HD Installation Manual download pdf (Page 14)

14 OMRCPMICRO

of 1.8 amps at 120 VAC. The terminals are wired in parallel with the compressor outputs so the coils will be

energized with the first compressor stage.

To start a condenser pump, install a jumper between terminals #11 and #12 and connect a single starter

between terminals #11 and #16 on TB2. When either of the lead compressor start, the condenser pump will

start.

To start a fan, connect the first fan of circuit #1 to terminals #11 and #16 on TB2. Connect the first fan of

circuit #2 to terminal #12 and #16 on TB2. When the lead compressor of a circuit starts, the first condenser fan

will start. See the Field Wiring Diagram and Compressor Control Schematics in the back of this manual for

more detail.

PC connection

The MicroTech controller can be connected to an IBM or IBM compatible computer for local or remote system

monitoring. Communication network wiring uses low voltage shielded twisted pair cable (Belden 8760 or

equal). The network uses the RS232 communications standard with a maximum cable length of 50 feet. An

RS232/485 adapter may be used to allow for cable runs to 5000 feet. See the Personal Computer Specification

section of this manual for hardware requirements.

Telephone line

If remote access and monitoring of the unit is chosen, then a voice quality direct dial telephone line is required.

The line must be a dedicated line and used only for modem access. The phone line must be terminated with a

standard RJ-11 modular phone plug. See the Start-Up and Shutdown section on page 39of this manual for

more detail on start-up procedures.

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Microtek MHP1-HD Installation Manual Page 14