CO detection, TPI775 meter different from gas co.

Specific Inspection Topics Inspecting HVAC Systems
1

On a recent inspection I noted high (35ppm +)levels of CO at the heat outlets (gas forced air furnace - I’m in Canada). I was actually in the house on two different days and took readings at two different times on both days with similar results. Each reading was taken over a 15 minute time span. The seller is in denial and had the gas co come out to check. They gave a report saying no problems.

  1. is anyone else using the tpi775 meter? have you ever suspected false readings?

  2. is there any condition in which a furnace can give off differing levels of CO? Can the length of time the furnace has been running influence this?

2

When was the last time you had your meter calibrated?

3

I’ve had this meter for about a year and a half.

4

There are variables such as down drafting.
Filter should be changed every year with heavy use.

5

Consider a training course such as this:
http://www.nationalcomfortinstitute.com/members/combustiontraining.cfm

Measuring for CO in ambient air is not as simple as waving the wand of your meter around a supply duct. Many inspectors do not understand or realize this.
Calibration of your equipment is important as well.

6

Kevin
Try calibrating , But keep testing. I had a furnace guy denied there was a problem the agent insisted it be checked . Seller agent said i was being to picky. They sent a fellow in he found 3 small cracks. Trust your tools but keep them updated. test it where you know the air is clear. so far sense i started checking i have found 5 furnaces with problems Kinda makes you wonder how many problems are hiding.

7

Wayne the “Deal Killer”