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While there isn't specifically a restriction directly with the spell, most deities don't take kindly to their clerics using opposed-alignment spells.
I'm not well versed in Pathfinder, but based on the wording here: http://paizo.com/pathfinderRPG/prd/spells/summonMonster.html , since the spell counts as the type if the creature summoned has an alignment or an elemental type, then in the question posted above, the spell would be considered a Lawful Good.
If you're not a cleric or cleric-type class that relies on a Deity's power, then you're probably fine. Otherwise, I'd expect a few days/weeks of repentance until I got my ability to use spells back.
Actually Clerics and ofher classes with alignment based castig restrictions cannot cast summon monster if the monster ia of an opposite alignment. LG cannot summon chaotic or evil monsters (and definitely not chaotic evil monsters)
Wizards, summoners and all the other classes are fine to conjure whatever creature they wish to..
Are there any alignment restrictions for the summon monster spells? For example, can an evil aligned Conjuror summon Hound Archons (which are LG).
Prux
To the original questions specifically,
1) The Summon Monster line has no inherent restriction in it, however it can have an alignment descriptor depending on what you summon and some classes do further restrict that.
2) Assuming by "evil aligned Conjuror" you are referring to a Conjuration school specialized Wizard, Yes, he may summon a Hound Archon . They have no alignment restrictions on what they can cast.
Actually Clerics and ofher classes with alignment based castig restrictions cannot cast summon monster if the monster ia of an opposite alignment. LG cannot summon chaotic or evil monsters (and definitely not chaotic evil monsters)
Wizards, summoners and all the other classes are fine to conjure whatever creature they wish to..
To the overall concept here,
You are close but slightly misunderstood it.
Some casters, Clerics for example, can't cast spells of opposing alignments. A spells alignment, if it has one (most don't), is defined by the spells alignment descriptor. The Summon X lines of spells are only given alignment descriptors if the creature summoned has an Alignment Subtype. That is not the same as their alignment, though it is related, it is a subtype of creature they are.
Regarding the Summon X lines, the subtypes of creatures summoned are listed with the spell or in the spell description for ease of reference.
While not as important with Summon Monster that distinction becomes particularly important with the Summon Nature's Ally line. Creatures like the Cyclops or Fire Giant, while evil, aren't innately (subtype) Evil so don't trigger the ban so Good Druids can summon them. Nor in the opposite direction would the Pixie since, while good, it is not innately (subtype) Good.
Short version
Some classes do have alignment restrictions
*As it applies to the Summon X lines of spells...
Creature 'alignment' isn't what matters
Creature 'Alignment Subtype' is what matters because subtype activates the spell descriptor which applies the class ban.
*(edit: That is also an important distinction, some abilities in game DO function off of alignment not alignment subtype. This is just not one of them.)