Alpine Gas Boiler Venting Problem

I recently had an Alpine alp080bw-2t02 installed to replace a very loud and large oil burner. I have some concerns which have been partially addresses by the plumbing company and I want to get some feedback before contacting them again.



This question has to do with venting and exhaust. There were 3 major issues.

1. There was the slight smell of fumes which I assumed was a new equipment smell as new parts got hot. This did not cause my CO sensors to go off .

2. The intake and exhaust were at 10" center to center when the absolute min. is 12"

3. There is a tiny round window to view the flame color. The color should be primarily blue however it was mostly orange depending on where I placed my eye and what angle I looked.



I talked to the salesman for the company and he set an appointment to come a week later. He explained that an Alpine Rep had said that taking the airtight cover off the boiler, to view the flame caused the air pressure in the system to change and affected the flame. In other words you can't see a blue flame because to do so you have to take the cover off.



 I went home and inspected more thoroughly and discovered a plate was not screwed tight on the left rear, near where the vent and intake attach. I could feel a cool breeze coming from the plate and I smelled some fumes. I called back and they agreed to come out that day and modify the exhaust so it was farther from the intake. They screwed the plate down tighter. I say tighter because I do still feel a very slight breeze at that location and this morning I smelled the fumes ever so slightly, at the top of the basement stairs where it likes to collect.



I am wondering how this unit is constructed? If the front latching panel needs to be airtight for the boiler to fire correctly then that means the intake/exhaust/fire box have open connections to the case of the unit. It is odd that at the plate at the rear I feel very cold outside temperature air but also smell exhaust. It would seem exhaust/intake/burner and the case all are interconnected and a plate with screws that is a weak link.



But why is there a slow but steady flow of air at the plate? I do not have a wood stove or anything which would create a vacuum inside the house. Could the force of heated air escaping through seams, wherever, in the house cause enough vacuum to pull exhaust and intake air into the living space.



Or is it possible that the exhaust and intake were not properly connected to the boiler?? I want to contact the plumbers again but would like to know more.



Thank you.

Andrew