9
OPT-AS3,4,5,8 (07-22) 160202-B
⚠ WARNING ⚠
Disconnect power to the unit.
NOTES:
• Line voltage wiring must be field-installed between the blower junction box and the evaporative
cooling module junction box. The tubing-encased wires are factory-connected in the cooling
module junction box.
• Models ADF/ADFH have optional 115V evaporative cooling module pumps. A transformer is
included on the unit.
• The two snap strain relief bushings, which must be used to prevent water from leaking into the
cabinet, are shipped in the bottom pan of the cooling module.
1. Remove compartment door panels, electrical compartment cover, and service panel in line with hole in cooling
module.
2. Drill 7/8-inch hole in cabinet end panel in line with hole in cooling module junction box.
3. Pull tubing-encased wires through hole in blower cabinet. Place one strain relief bushing around tubing and insert
bushing into hole.
4. Route wires across cabinet bottom. If there are any filters, run wires through slot in bottom filter rack. If there are
inlet dampers, take care to ensure that wires do not interfere with damper controls.
5. Run wires up to electrical compartment, remove plug from one bottom entrance hole, and push tubing-encased
wires into electrical compartment. Place other strain relief bushing around tubing and insert bushing into hole in
electrical compartment.
6. Connect wires to terminal blocks in accordance with wiring diagram provided with heater. If there is excess tubing
and/or wiring, trim before making connections.
7. Before unit is operated, replace all door panels and fasten all latches.
Piping Connections
⚠ CAUTION ⚠
On outdoor systems, the water reservoir must be drained and the pump motor must be turned off
when the outside temperature falls below 32°F. The pump must never be operated without water
in the reservoir.
Float Valve Connection
•
In a cooling module with pump and float controls, a float valve (see
) maintains the appropriate water
level in the reservoir.
•
Connect the fresh water supply to the float valve inlet using a field-supplied 1/4-inch diameter tubing with compression
nut and tubing ferrule. Place the nut and ferrule over the tubing and insert the tubing into the float valve stem.
Tighten the nut securely.
Figure 10. Float Valve Connection
COMPRESSION NUT AND
TUBING FERRULE
1/4-INCH TUBING
CABINET SIDE PANEL
FLOAT VALVE ROD