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The order of this thread started with me posting the question, which was then followed by Kyle's answer and our conversation in the comments of his answer. I then appended my original post to include the workaround I have attempted and the final solution is in the paragraph below.

After suggestions from @Kyle Benne I placed a dummy object downstream of the fan (any object with capacities zeroed out) to give an extra node to add a SetpointManager:Scheduled to. The final results is there is a fan and immediately after it there is a SetpointManager:Scheduled with a constant value of 55F, there is then a dummy object and after this object there is another SetpointManager:Scheduled with a constant value of 75F. The ERV, mixed air node and node just after the furnace use a SetpointManager:MixedAir to reference the SPM at 55F and the cooling coil uses the same SPM class to reference the 75F SPM.

The issue this solves is being able to use a DOAS with a floating supply temperature so that the zone systems handle most of the load. The initial attempts to use a SetpointManager:Scheduled:DualSetpoint object didn't work because when used on an airside system the SPM will just average the high and low setpoints, which is not the desired effect.

The order of this thread started with me posting the question, which was then followed by Kyle's answer and our conversation in the comments of his answer. I then appended my original post to include the workaround I have attempted and the final solution is in the paragraph below.

After suggestions from @Kyle Benne I placed a dummy object downstream of the fan (any object with capacities zeroed out) to give an extra node to add a SetpointManager:Scheduled to. The final results is there is a fan and immediately after it there is a SetpointManager:Scheduled with a constant value of 55F, there is then a dummy object and after this object there is another SetpointManager:Scheduled with a constant value of 75F. The ERV, mixed air node and node just after the furnace use a SetpointManager:MixedAir to reference the SPM at 55F and the cooling coil uses the same SPM class to reference the 75F SPM.

The issue this solves is being able to use a DOAS with a floating supply temperature so that the zone systems handle most of the load. The initial attempts to use a SetpointManager:Scheduled:DualSetpoint object didn't work because when used on an airside system the SPM will just average the high and low setpoints, setpoints (a constant average setpoint), which is not the desired effect.