Generac Power Systems PowerPact 6561 Installation Notes page 85

Air 1 and Air 2 OPCB terminals
 Route the thermostat cable (from the furnace to the outside air conditioner unit) to the transfer
switch.
 Route the cable away from High voltage wires.
 Connect the wire to the upper terminal Air 1 on the OPCB. These are normally closed contacts which
open upon load shed conditions.
 From the lower terminal Air 1 route the wire back to the air conditioner unit.
 If you are shedding two air conditioners do the same procedure using OPCB Air 2 for the second air
conditioner.
 Contact ratings for Air 1 and 2 - 24VAC, 5.0Amps Max
 Note: These instructions are for typical air conditioner installation. Control of a heat pump and 2-stage
air conditioners will require special conditions or the use of a PMM/DLM module to control the loads.
Order of Load Shedding
Load 1 - 4 OPCB terminals

Determine the order of shedding for the loads to be connected to Load 1 thru 4 on the OPCB.
 Load 1 is the highest priority and Load 4 is the lowest priority.
 If connecting an existing (Hot) load, make sure the circuit breaker for the load is in the off position.
PMM/DLM Installation
 Handle the PMM/DLM carefully. Do not drop or damage, protect against impact, construction grit and
metal chips.
 Install the PMM/DLM Module as close as possible to the load that is to be connected to it.
 The PMM/DLM Module must be mounted on the back surface.

Indoor installation - The PMM/DLM Module can be mounted in any orientation that is convenient.
 Outdoor installation - The PMM/DLM Module MUST be mounted with the drain hole on the bottom.
 To prevent switch distortion, level all mounting points.
 To maintain NEMA-3R rating, a suitable UL-listed-for wet-locations box connector must be used.
Connect the PMM/DLM
 The PMM/DLM Module is NOT intended for use with rigid metal conduit.
 Make sure to turn OFF both UTILITY (Normal) and EMERGENCY STANDBY power supplies before
trying to connect power source and load lines to the transfer switch and PMM/DLM Modules.
 Use a torque wrench to tighten the lugs, being sure not to over- or under-tighten the lugs. (See decal
on top of contactor.)
 Connect LINE power source wires to PMM/DLM contactor terminals L1 and L2.
 Connect LOAD power wires to PMM/DLM contactor terminals T1 and T2.

Connect the Ground wires to the ground stud inside the PMM/DLM Module.
 Connect the PMM/DLM contactor (coil) to the contactor (LOAD) terminal on the OPCB in the transfer
switch.
 The selection of the contactor (Load) terminal used will determine the priority of the load being
controlled.

If using a PMM Module, it is a 24VAC circuit and wiring methods for class 2 should be used.

A grommet is provided to route Class 2 wire through the PMM Module.

The grommet can be used for any knockout for NEMA-1 installations.

For NEMA-3R it can only be used in the bottom knockouts.

If using an older DLM Module, it's a 120V circuit, 18-26AWG copper wires should be used as control
wires.

ONLY 1 PMM/DLM Module can be connected to each Load connection (1-4) on the OPCB. Up to a
total of 4 PMM/DLM Modules can be connected to the OPCB.
(A/C1, A/C2, A/C3, A/C4 on the Smart AC Module)
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