sorry, no model number but this is a typical 10-15 year old Carrier RTU. Gas heat, electric cooling 15 ton unit. I think the 20 ton unit is identical just different fan and burner configurations.
Has the (2) LONG supply and return air duct drops with the condenser fan motors mounted in a "V" section.
Looking for the factory spec sheet.
If anyone has a spec sheet they can post or e-mail would be helpful.