STI HK3 - Manual (Page 4)

4
Installation Instructions
Mount Enclosure back box - Refer to Fig 1
1. Set heater assembly with cover aside. Press (4) plastic tabs into slots on back box and drill (4)
1/4” (6.4mm) diameter holes in mounting surface for plastic anchors provided. Attach back
box to wall using (4) #10 x 1-1/2”screws provided.
2. Attach 3/4” rigid conduit and conduit sealing hub (Crouse-Hinds 3/4” EYSX 21 or equivalent)
to back box. Conduit should be installed according to applicable NEC and local codes.
3. Pull 24 VDC and alarm wiring into back box through top conduit; and pull 110 or 240 VAC
wiring into back box through bottom conduit per NFPA 70, NEC and local codes.
Note: Wire size to be 12-22 AWG.
Install Fire Alarm Pull Station and Dual Monitor Module to Heater and Cover
Assembly - Refer to Fig 2.
4. Lift the cover from heater assembly and allow it to hang from cables. Connect the provided
high temperature wires to the pull station.
5. Attach the pull station to the slide plate using (2) #6-32 x 3/8” screws provided. Adjust the
slide plate so the pull station or slide plate does not cover either the fan opening or vent slots.
Note: If the fan opening or vent slots are covered, the plate mounting screws can be moved
to the alternate mounting position. After mounting pull station adjust the slide plate so there
are no gaps large enough to touch the heaters behind the pull station.
0
8 7
/1
6 i
n.
(21
4m
m)
4 3
/8
in
.
(11
1m
m)
LOW VOLTAGE
WIRE INPUT
SEALING HUB
(NOT PROVIDED)
3/4 in. NPT MALE NIPPLE
(NOT PROVIDED)
MOUNTING TAB
(4) PROVIDED
BACKBOX
#10 x 1 1/2 in.
PAN HEAD SCREW
(4) PROVIDED
HIGH VOLTAGE WIRE INPUT
MOUNTING
SURFACE
SCREW ANCHORS
(4) PROVIDED
DRILL (4) 1/4 in. (6.4mm)
DIAMETER HOLES
3/4 in. NPT MALE
NIPPLE (NOT PROVIDED)
SEALING HUB
(NOT PROVIDED)
FIG. 1