The TSSA's position is that a 313D cannot wire the AC into the furnace without a gas certificate.
The OCOT has released a Residential Air Conditioning Systems Mechanic Apprenticeship Training Standard (http://www.hvactechgroup.com/files/OCOT313D.pdf). It seems to include the revoked Ontario Regulation 75/05.
The OCOT document seems to contradict itself,
QuoteSection 34(1) 2. Install and start up the system and verify the operation and function of the system.
This seems to imply a 313D can wire the AC into the furnace without a TSSA certificate.
QuoteSection 34(3) Nothing in this section authorizes a person who holds a certificate of qualification or who is otherwise authorized to work in the trade to perform any function or carry out any activities for which a certificate is required under the Technical Standards and Safety Act, 2000. O. Reg. 275/11, s. 34 (3).
This seems to imply you do need TSSA certification to wire the AC into the furnace.
I asked the OCOT to interpret this and they replied,
QuoteGood Afternoon,
Thank you for contacting the Ontario College of Trades. Your e-mail has been forwarded to the Compliance & Enforcement Division for review.
We followed up with an Enforcement Officer who is a Refrigeration & Air Conditioning Systems Mechanic with regards to your question and this is the information we received:
'If they have a 313A license the individual can connect the low voltage wires in a furnace in a commercial or residential application. If they have a 313D the individual can connect the low voltage wires in a furnace if it is a residential application and the system is under 5 tons or 60 thousand BTUS and wood construction.'