One teachers' union is recommending rejection of the Lansdowne Road Agreement on pay in the public service, while another will ask members to vote Yes.
The deal would restore around €2,000 to the pay of most public servants in three phases between January 2016 and September 2017.
But the Teachers' Union of Ireland (TUI) said the proposals did not allay a number of significant concerns of lecturers in institutes of technology and teachers in second-level schools.
It is calling for a No vote when its members ballot in the autumn.
TUI president Gerry Quinn said its members in institutes of technology were experiencing high levels of work-related stress as a result of the extra hours given for the duration of the Haddington Road Agreement, and it was completely unacceptable to lecturers that it would continue as part of the new proposals.
He said at second level, it was also unacceptable that teachers had to continue the extra hours required under the Croke Park and Haddington Road agreements.
Meanwhile, the Irish National Teachers' Organisation (INTO) said it favours acceptance of the deal.
INTO general secretary Sheila Nunan said acceptance of the agreement was an opportunity to begin to recover income that had been lost through pay cuts and the public service pension levy.
She said teachers had made a substantial contribution to Ireland's economic recovery and were entitled to see some restoration of income.
Arrangements are under way to ballot its members this month.
The Impact union, a major public service union, is also recommending a vote in favour of agreement in a ballot that will get under way next week.