User`s manual

—
12
—
Special Procedures for 208-V Operation
For operation on 208 v:
Remove black wire with
1
/
4
-in. female spade connector from
the 230-volt male spade transformer and connect to 200 volt
1
/
4
-in. spade of transformer.
Control Voltage Connections
Install a factory-approved room thermostat. Locate the ther-
mostat on an inside wall in the space to be conditioned where
it will not be subjected to either a cooling or heating source
or direct exposure to sunlight. Mount the thermostat 4 to 5 ft
above the floor.
NOTE: For wire runs up to 50 ft, use no. 18 AWG insulated
wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insu-
lated wire (35 C minimum). For over 75 ft, use no. 14 AWG
insulated wire (35 C minimum). All wire larger than
18 AWG cannot be connected directly to the thermostat and
will require a junction box and splice at the thermostat.
Pass control wires through the hole provided in the corner
post; then feed wires through the raceway built into the cor-
ner post to the 24-v barrier located on the left side of the con-
trol box (see Fig. 15). The raceway provides the UL required
clearance between high- and low-voltage wiring.
Connect thermostat wires to pigtails of low-voltage circuit in
low-voltage section on control box using terminal strip.
Heat Anticipator Setting
The room thermostat heat anticipator must be adjusted cor-
rectly to ensure proper heating performance. Set the heat
anticipator, using an ammeter to determine the exact
required setting.
NOTE: For thermostat selection purposes, use .14 amp for
the approximate required setting. For units with two-stage
gas valves, set heat anticipator stage 2 at .20 amp. See
Table 1 for further clarification.
Failure to make a proper heat anticipator adjustment may
result in improper operation, discomfort to the occupants of
the conditioned space, and inefficient energy utilization;
however, the required setting may be changed slightly to pro-
vide a greater degree of comfort for a particular installation.
F. Accessory Installation
Any required accessories should be installed on the unit at
this time. Refer to Table 3 for available accessories. Control
wiring information is provided in the unit wiring book.
DANGER: Make sure that the power supply to the
unit is switched OFF and lockout tag is installed before
making any wiring changes. Electrical shock can cause
personal injury or death.
LEGEND
Fig. 14 — Low-Voltage Connections
AHA —
Adjustable Heat Anticipator
TH —
Thermostat-Heating
CC —
Cooling Compensator Field Wiring
TC —
Thermostat-Cooling Factory Wiring
Fig. 15 — Field Control Wiring Raceway