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Route the thermostat cable or equivalent single leads of
wire from the subbase terminals to the low-voltage connections
on the unit (shown in Fig. 9 and 10) as described in Steps 1 and 2
below.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire gauge) insulated wire (35_C minimum). For 50 to 75 ft, use
no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35_C minimum). All wire larger
than no. 18 AWG cannot be directly connected to the thermostat
and will require a junction box and splice at the thermostat.
1. Connect the thermostat wires to the screw terminals on the
low voltage connection board.
2. Feed the control wires through one of the provided holes
in control box. Some models may be equipped with a
raceway built into the corner post located on the left side
of control box (See Fig. 11.) This raceway provides the
required clearance between high- -voltage and low voltage
wiring. For models without a raceway, ensure to provide
the NEC required clearance between the high-voltage and
low-voltage wiring.
Fig. 11 --- Field Control Wiring
DEFROST BOARD
The defrost board timer is factory set for a 30 minute defrost
cycle. To adjust it to a 50 or 90 minute cycle, remove the wire
connected to the 30 minute quick connect on the defrost board.
(See Fig. 12.) Connect the lead to the 50 or 90 minute quick
connect on the defrost board, depending on the application.
colored
STEP 6 —ADJUST FACTORY-INSTALLED
OPTIONS
DISCONNECT SWITCH
The optional disconnect switch is non-fused. The switch can be
locked in place for safety purposes. The disconnect switch is only
available for limited applications. See Electrical Data Tables
4A-4D and 5A- -5D for disconnect switch usage.
CONVENIENCE OUTLET
An optional convenience outlet provides power for rooftop use.
For maintenance personnel safety, the convenience outlet power
is off when the unit disconnect is off. Adjacent unit outlets may
be used for service tools. An optional "Hot Outlet" is available
from the factory as a special order item.
NOVAR CONTROLS
Optional Novar controls (ETM 3051) are available for
replacement or new construction jobs.
MANUAL OUTDOOR- -AIR DAMPER
The outdoor-air hood and screen are attached to the basepan at the
bottom of the unit (for shipping).
Assembly:
1. Determine the amount of ventilation required for the
C06010
building. Record the amount for use in Step 8.
2. Remove the filter access panel by raising the panel and
swinging it outward. The panel is now disengaged from
the track and can be removed. No tools are required to
remove the filter access panel. Remove the outdoor-air
opening panel. Save the panels and screws. (See Fig. 13.)
3. Separate the hood and screen from the basepan by
removing the screws and brackets securing them. Save all
screws and discard the brackets.
4. Replace the outdoor air opening panel.
5. Place the hood on the front of the outdoor air opening
panel. See Fig. 14 for hood details. Secure the top of the
hood with the 6 screws removed in Step 3. (See Fig. 15.)
22
Fig. 12 --- Defrost Board
C06011
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