From inside (document excerpt):
Connecting the V.lve Wir (figure 3) Step 1- Route,. mulu·wtre. dlrecl-bur1al sprinkler cable from til sprinkler Urner LO the valves. If the cable run Is less lhan SOO’, 18 AWe wire I sufficient. For dlnan e from 800′ – 2000′, 14 AWe wire (s recommended. flgun 3 I ” In lim’ Valv(‘ i lotiels – Installation Guide The Toro an automatic .sprinkler $)’Stem controlled I’ In-line electrtc valves “‘e deslgood ror me In by a 24 V a.e lImer.