Carrier 52SC, Installation, Operating And Maintenance Instructions

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52S
SERIES
10
■ INSTALL ENERGY MANAGEMENT (EM) ACCES-
SORY KIT — This accessory kit permits individual
units to be turned off from a remote location such as a
hotel control desk to conserve energy when the room is
unoccupied. Freeze guard protection prevents the
room temperature from dropping below 40° F, overrid-
ing any OFF command, including front desk control.
Electric heat will remain activated until the tempera-
ture reaches approximately 60° F.
See Figure 14 for accessory kit location in control box.
After EM accessory kit has been properly installed,
connect low-voltage (24 VAC) field-supplied wires from
chassis terminal board to your central desk panel (see
Figure 15).
ADJUSTMENTS
■
ADJUST AIRFLOW DIRECTION
— The discharge
air grille is mounted on the unit so that the air dis-
charges forward. If upward discharge is required,
remove the grille, invert it, and reinstall on the
chassis.
■
ADJUST VENT —
The VENT knob is located on the
side of the unit. Slide VENT knob manually to open or
close vent. Vent remains in the position selected.
IMPORTANT: In order for freeze guard to operate,
the unit must be put into the HEAT mode.
IMPORTANT: The manufacturer currently does
not supply any central desk equipment. This type
of equipment should be handled through your local
electrical contractor.
FIGURE 14 — EM ACCESSORY KIT
LEGEND
NOTES:
1. All wiring must conform with NEC and local codes.
2. Field control wiring suitable for NEC Class 2 control circuit, at 24 volts.
FIGURE 15 — EM ACCESSORY KIT
SCHEMATIC DIAGRAM
FGT — Freeze Guard
Thermostat Terminal Board
Connection
NEC — National Electrical Code Field Control Wiring
SW — Switch
Primary Relay
TB — Terminal Board
PR