ENVIRO-TEC
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• Verify fan speed will change from High, Medium,
and Low by utilizing remote 3 speed switch,
thermostat or connecting by P18 to P15, P18 to
P16, or P18 to P17. If fan speeds are adjustable
the relay board is producing 24 Volts.
• If board is not working, measure 24 volts between
P20 and P19, if 24 volts (19-29 VAC) is not pres-
ent then measure across terminals S1 and R, if
24 volts (19-29 VAC) is not present then return
board to local sales representative.
LD13952
FIG. 5 - FAN COIL RELAY BOARD (CURRENT)
• Verify plug jumper JP3 (Figure 5) is installed or
wire (Figure 6) is installed between W2 and R.
Either JP3 or wire jumper must always
be installed unless thermostat drawing
indicates otherwise.
JP3 should be removed for single
speed operation using “G” terminal.
For thermostat with 3 speed switching,
remove JP1 but leave JP3 installed.
FIG. 6 - FAN COIL RELAY BOARD (OBSOLETE)
JP3
JP3
LD13951
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