Orthodox Calvinism does not deny that repentance is a condition of salvation.
“Repentance unto life is a saving grace, whereby a sinner, out of a true sense of his sin, and apprehension of the mercy of God in Christ, doth, with grief and hatred of his sin, turn from it unto God, with full purpose of, and endeavour after, new obedience.” (The Westminster Shorter Catechism, Question 86)
“Repentance unto life is a saving grace, wrought in the heart of a sinner by the Spirit and Word of God, whereby, out of the sight and sense, not only of the danger, but also of the filthiness and odiousness of his sins, and upon the apprehension of God's mercy in Christ to such as are penitent, he so grieves for and hates his sins, as that he turns from them all to God, purposing and endeavoring constantly to walk with him in all the ways of new obedience.” (The Westminster Larger Catechism, Question 76)
“Justifying faith is a saving grace, wrought in the heart of a sinner by the Spirit and Word of God, whereby he, being convinced of his sin and misery, and of the disability in himself and all other creatures to recover him out of his lost condition, not only assents to the truth of the promise of the gospel, but receives and rests upon Christ and his righteousness, therein held forth, for pardon of sin, and for the accepting and accounting of his person righteous in the sight of God for salvation.” (The Westminster Larger Catechism, Question 72)
“Although repentance is not to be rested in, as any satisfaction for sin, or any cause of the pardon thereof, which is the act of God's free grace in Christ, yet it is of such necessity to all sinners, that none may expect pardon without it.” (The Westminster Confession of Faith, Chapter XV, paragraph III)
Orthodox Calvinism acknowledges the necessity of repentance and faith in Jesus Christ for salvation. Those who deny the necessity of faith or repentance are not orthodox Calvinists, but rather have been condemned by orthodox Calvinists and all orthodox Christians as heretics.