Field Controls ABA-1 Instrucciones De Uso página 2

INSTALLATION INSTRUCTIONS FOR USE WITH THE TM-90R OR TM-2000
CAUTION: All wiring should conform to the National Electrical Code, NEC, and any applicable local codes.
CAUTION: Disconnect the TM-90R/TM-2000 transformer from the receptacle and switch "off" the furnace electrical supply
prior to installation.
1. Locate a suitable mounting position for the air pressure switch. This should
be on the furnace enclosure or on a solid structure close to the furnace.
The switch must be mounted such that the diaphragm is vertical. Mark the
four mounting screw holes using the switch mounting plate as a template.
The screw holes can be pre-drilled using a 1/8" or smaller drill bit. Use care
when drilling any holes to avoid damaging any internal structures. (See
Figure 1)
2. Mount the air pressure switch at the selected location using four of the six
sheet metal screws supplied with this kit. (See Figure 1)
3. Bend a "U" shape in one end of the aluminum flow sensing tube. (See
Figure 2)
4. a. If the furnace DOES NOT have an air conditioner "A" coil at the warm
air outlet of the furnace; drill a ¼" hole into the warm air supply plenum
of the furnace. This hole should be approximately six to twelve inches
from the top of the warm air outlet of the furnace.
b. If the furnace DOES have an air conditioner "A" coil at the warm air
outlet of the furnace; drill a ¼" hole into the warm air supply plenum
high enough above the "A" coil such that it will not contact the "A" coil
when installed. Use care when drilling the hole to prevent damaging the
"A" coil. (See Figure 3)
5. Slide one of the tube clamps onto the "U" shaped end of the tube. Insert the
bent end of the tube into the ¼" hole such that the open end is pointing
directly into the oncoming air flow. Mark and pre-drill (if
necessary) a mounting screw hole for the clamp. Secure
the clamp to the plenum using one of the two remaining
sheet metal screws. (See Figure 4)
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Figure 1
Figure 2
Figure 3
Figure 4