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I think a flex connector should only be used when there is an appliance to connect it to.

Any length nipple would be approved.

Where are you referring to 2 gas connectors ? Is a cabinet still considered a wall ??

Quote from: Admin on January 07, 2026, 10:10:42 PMIt's hard to tell but if that's two gas connecters connected together it's probably against code that they are passing through the cabinet.

QuoteClause 6.21.2
A gas connector shall
a) be protected from damage;
b) not pass through a wall, floor, ceiling, or partition;
c) be connected to rigid piping or tubing located in the same area as the appliance; and
d) comply with Clauses 4.5.2 and 4.9.1.

I would remove everything and install a nipple and cap into the shut off valve.

QuoteClause 6.12.1
During the period when an appliance is not connected to an outlet of a piping system, the outlet shall be made tight by means of
a) a plugged valve; or
b) either a cap or plug made of material compatible with the material of the piping or tubing system.

1. If I remove the flex hose can I cap the silver flare connection is that allowed ? The silver connection is connected to black pipe
2. If I cap after the shutoff is there a rule of how long the pipe should or should be

It's hard to tell but if that's two gas connecters connected together it's probably against code that they are passing through the cabinet.

QuoteClause 6.21.2
A gas connector shall
a) be protected from damage;
b) not pass through a wall, floor, ceiling, or partition;
c) be connected to rigid piping or tubing located in the same area as the appliance; and
d) comply with Clauses 4.5.2 and 4.9.1.

I would remove everything and install a nipple and cap into the shut off valve.

QuoteClause 6.12.1
During the period when an appliance is not connected to an outlet of a piping system, the outlet shall be made tight by means of
a) a plugged valve; or
b) either a cap or plug made of material compatible with the material of the piping or tubing system.

There is a small shut off valve where the flex line ends ( it's actually in the next cabinet)
1. Does a small pipe/ cap have to be added when the yellow flex line is removed ?
2.Can the flex line stay ?
3. Is a "dead leg ok on the system like this ?

How / where should this be capped off when going back to electric (there is a shutoff )
(What icon do I use to post a pic ?)

Quote from: Byron on August 20, 2025, 09:24:48 PMWe've just had a few guys do their G3 practical it was mostly knowing what parts of a furnace are called and what their purpose is, as well as knowing your scope of work from O.Reg 212/01 https://www.ontario.ca/laws/regulation/010212

wow, i think its different for everyone aye? some people have to thread pipe, cut, ream, and fix a faulty furnace i believe? but i assume if its for g3 then it shouldn't be too crazy, especially as someone who is challenging the exam, it should be pretty simple? can u please elaborate about the questions?

Hey! i'm starting to prepare for my theory g3 and practical g3 after that, i was wondering if anyone has any idea of what practical questions they are asking nowadays, i'm challenging the g3 by self study, never worked in hvac industry before, i learnt how to thread pipe and cut pipe from youtube, but wondering if there's more resources for practical exam.

Hello,

I am Kishan Patel. I am looking to register with an HVAC program. I am new to this field of study. I have done Business management and planning to take HVAC study to pursue my career as 313A licence holder. I am willing to get help or guidance that where can i start this processes . Please your guidance will be truly appreciated.

Thanks in advance.

Gas furnace in heat mode and a/c turned off at breaker. The discharge line and txv freeze up. What's causing this?

Hello,
We have a hydronic heating system consisting of a Smith boiler that was installed in 2003 and a conversion burner for natural gas which is about 17 years ago (it used to burn heating oil). It was connected to 2.5 inch old cast iron heating pipes running to old stand up cast iron radiators. In early November we had a contractor replace all the cast iron with PEX (the red kind used for domestic hot water, which may be a whole different issue) connected to modern baseboard fin type heaters in the entire house. In addition, he installed a "fan in a can" to increase oxygen getting to the burner. We also insulated must of the exterior walls in the house.

According to our latest gas bill we used 2.3 times as much natural gas during this year's December billing cycle compared with last years. I would expect this system to be more efficient than the previous one. Could something in the new system be causing more natural gas to be burned?

A few additional things that may have come into play:

    The expansion tank failed during this billing cycle and the system was dumping water until we had it replaced last week. It was dumping water for 2 to 3 weeks during the billing cycle.
    The installer put antifreeze into the system when he installed it which it didn't have before.
    Prior to November, the old system consisted of 4 rooms with stand up radiators and 3 rooms with 2 year old modern fin type baseboards so it was mixed. I believe the contractor may have installed high output radiators in those 4 rooms.
    Finally, although we insulated most of the walls, the one that didn't get insulated is the room with the thermostat.

I thought I'd run this by the forum before I approach the contractor and start asking questions.

Thank you for your time
-Greg