From inside (document excerpt):
Weather-Resistant Controller Cabinet Model GK212-CAB-01 Installation Instructions Cabinet Installation Select a location for controller cabinet which is accessible to a 120 VAC power source and 24 VAC valve control wires. 1. Open the cabinet cover and remove the contents of the installation package stored inside. 2. Remove mounting plate (A) secured with four screws. 3. Carefully remove the wiring knockout plugs (C) from bottom or back of cabinet as required.
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4. Using a 3/16 ” (7mm) drill bit or punch, remove 1, 2, or 3 lower mounting screw hole plugs (D) as required. Note: Screw anchors must be installed if installing the cabinet to drywall or masonry. 5. Position the cabinet on the wall positioning the keyhole slot (E) at eye level. Install #10 x 11/2 ” (38mm) wood screws (provided) through top portion of keyhole slot and lower mounting hole(s). 6. For 120 VAC power/ground wires, install 1/2 ” (13mm) threaded conduit adapter and conduit (F). For valve control wires install 3 /4 ” (19mm) conduit adapters and conduit (G). WARNING: To prevent electrical shock hazard, disconnect power source by switching off circuit breaker or removing fuse prior to making any wire connections. Do not apply power until installation has been completed. All installation materials and procedures must comply with applicable electric codes. Wiring Installation 1. Using #12 or #14 insulated solid copper wire, route hot (black), neutral (white), and equipment ground wires through conduit (F) from the power source into the cabinet. 2. Carefully remove 1/2 ” (13mm) of insulation from ends of wires. To secure wires to AC receptacle, insert the neutral (white) wire into a bottom connection port and the hot (black) wire into a top connection port. Secure the ground wire to green ground screw. 3. Position AC receptacle plate (B) into the cabinet and secure with four screws as shown. 4. Route the valve control wires through the conduit (G) into the cabinet. 5. Position mounting plate (A) while routing the valve control wires out through the slots provided. Secure with four screws. Note: If installing an alternate brand of controller, install the mounting plate with the reverse (smooth) side facing out. Fasten the controller to the mounting plate as required. Several pilot screw holes are provided in mounting plate for this purpose. 6. Install the GreenKeeperTM controller (H) by aligning the slotted openings on the back of controller housing with the tabs on the mounting plate. Lower controller on tabs to engage. 7. Attach the valve control wires referring to the installation instructions provided with the controller, 8. Plug transformer (I) into the AC receptacle and apply power.