ENVIRO-TEC
32
FORM ET115.24-NOM11 (118)
Tools needed for installation/troubleshooting:
• Digital multimeter capable of measuring 30 volts
AC
• Insulated 1/8" at bladed screwdriver
• Fuse puller (optional)
• Mini hook test clips for multimeter (optional)
Fuse: A fuse is included on the secondary side of the
transformer to protect the transformer from incorrect
wiring of thermostat, controller, etc. that shorts the
24VAC and COM. The fuse is a fast-acting glass body
cylindrical fuse (5x20mm). If tripped, replace the fuse
by removing the tripped fuse with fuse pullers and
replace using one of the below listed fuses.
Suggested fuse replacement information:
TABLE F.5 – REPLACEMENT FUSE
Transformer Fuse Part Number Manufacturer Part Number
30VA 2A PE-06-0000 Littelfuse 0235002.MXP
Bussmann BK/GMA-2-R
50VA 3A PE-06-0016 Littelfuse 0235003.MXP
Bussmann BK/GMA-3-R
HEAT Output – The HEAT output connects to an
electric heat contactor or relay. This output represents
the command signal from the thermostat or controller
on the W1 input. The output is interlocked with the fan
relays to ensure that a fan speed is commanded when
electric heat is requested.
DAMP Output – The DAMP output connects to a
motorized damper actuator used to control airow
from an external source. This output provides 24VAC
to energize the damper actuator. This output is
interlocked with the fan relays to ensure that a fan speed
is commanded before energizing the damper actuator.
TABLE F.6 – FIELD INSTALLED COMPONENT DESCRIPTIONS
Name Description
Field-provided Float Switch
To install a oat switch, wire the oat switch leads into S1 and C on the screw
terminals. After wiring the oat switch, remove jumper JP2. The JP2 jumper
must be removed for the oat switch to operate correctly.
Note: If a oat switch was installed in the factory, the oat switch may be connected
through a factory-provided harnesses instead of wired to the screw terminal.
Start/Stop for the fan
To start or stop the fan from an external controller, wire the leads for the switch
contacts that will be made or broken to R and G on the screw terminals. After
wiring the switch, remove jumper JP3.
Remote 3-speed switch
To add a remote 3-speed switch, wire the leads for the switch to G, H, M and L
on the screw terminals. After wiring the switch, remove jumper JP1.
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