Operating instructions

INSTALLATION PROCEDURES

GROWMASTER SERIES OF CONTROLLERS

PANEL MOUNTING

Mount the control panel in an accessible location. Make sure that the location is free of vibration and in close

proximity to the devices being controlled. Always consider voltage drop of electrical current when locating the

control panel. Securely mount the panel.

SWITCHING CONTACTORS AND RELAYS

The control panel will operate the greenhouse equipment via load contactors and load relays. ALL RELAYS

AND LOAD CONTACTORS USED MUST HAVE A SURGE SUPPRESSOR INSTALLED ACROSS THE

COIL OF THE RELAY OR LOAD CONTACTOR. These surge suppressors are readily available from Micro

Grow Greenhouse Systems, Inc. All load contactors and relays are also readily available from Micro Grow

Greenhouse Systems, Inc. To decide which to use, follow this guide:

LOAD CONTACTORS: Exhaust fans, pad pumps, horizontal air flow fans, heating pumps, fan jets, large

heaters, crop lighting, and all other larger electrical loads over 1/6 H.P.

LOAD RELAYS: Signal switching such as the small control lines for gas fired heaters, control lines for vent

and shade system controls, small loads such as motorized shutters, other loads up to 1/6 H.P.

CUSTOM CONTACTOR AND RELAY PANEL AVAILABLE A custom built load contactor and load relay

panel is available from Micro Grow Greenhouse Systems, Inc. This panel will contain all of the required

switching apparatus for your project, as well as a correctly sized machine tool transformer. Contact Micro

Grow Greenhouse Systems, Inc. for pricing and availability.

TRANSFORMERS

A 24 VAC transformer will power the control panel. It is important to use a MACHINE TOOL type. A Machine

Tool Transformer is a heavy-duty variety that will allow for high inrush currents that are associated with the use

of load contactors and relays. Micro Grow Greenhouse Systems, Inc. stocks these types of transformers.

Use no smaller than a 50 VA Machine Tool Transformer. For a system that has more than three load

contactors connected, use a 100 VA Machine Tool Transformer.

ELECTRICAL CIRCUITS

The electrical circuit that feeds the machine tool transformer must have no other loads connected to it. This

will prevent damaging surges from other related electrical devices. Follow all local and national codes in the

connection of all of the greenhouse equipment. Always allow for voltage drop conditions. Always consider

that the greenhouse is a wet environment. Always follow the code rulings for disconnect switches and

overcurrent devices on greenhouse equipment. USE A QUALIFIED AND LICENSED ELECTRICIAN AT ALL

TIMES.