Carrier 50TFF007-014 Product Data page 39

If outdoor-air alone cannot satisfy the cooling require-
ments of the conditioned space, and the OAT is above the
MECH CLG LOCKOUT set point, the EconoMi$er inte-
grates free cooling with mechanical cooling. This is accom-
plished by the strategies below.
NOTE: Compressors have a 2-minute Minimum On, Mini-
mum Off, and Interstage delay timer.
1. If Y1 is energized, and the room thermostat calls for
Y2 (2-stage thermostat), compressor no. 1 and OFM
are energized. The EconoMi$er damper is main-
tained at its current position.
2. If Y1 is energized for more than 20 minutes, and Y2
is not energized (whether or not a 2-stage thermostat
is used), compressor no. 1 and OFM are energized.
The EconoMi$er damper is maintained at its current
position.
3. If Y1 is energized, and compressor no. 1 is already
energized (see Step 2) and the room thermostat calls
for Y2, compressor no. 1 continues to operate. If Y2
remains energized for more than 20 minutes, com-
pressor no. 2 is energized.
NOTE: Compressor no. 2 cannot be energized unless
there is a signal for Y2 from the space thermostat.
4. If compressor no. 2 is energized, and the Y2 signal
from the thermostat is satisfied, compressor no. 1
and 2 are deenergized. Reasserting Y2 will start com-
pressor no. 1 and (after a 20-minute interstage delay)
compressor 2.
5. If compressor no. 1 is energized and the thermostat is
satisfied, compressor no. 1, the OFM, and IFM are
deenergized and the EconoMi$er modulates closed.
TEMP SYSTEM THERMOSTAT (WITH TIMECLOCK)
When the OAT is below the MECH CLG LOCKOUT set
point, the compressors remain off.
Heating, units with economizer (If Accessory
Heater is Installed) — When the room thermostat calls
for heat through terminal W1, the evaporator-fan contac-
tor and heater contactor no. 1 are energized. On units
equipped for 2 stages of heat, when additional heat is
needed, heater contactor no. 2 is energized through W2.
The economizer damper moves to the minimum position
during heating. When the thermostat is satisfied, the
damper moves to the fully closed position.
TEMP systems
A TEMP System is a network of communicating Carrier
TEMP System Thermostats and rooftop, factory-mounted
Apollo direct digital controls, each serving its own zone
and heating/cooling unit. Networking allows your building
manager to easily access each of your systems from a sin-
gle location...whether they are in the same building or
located throughout town.
The TEMP System's inherently flexible, modular base
design supports the exact number of independent, single
zone systems you require...no more, no less, no compro-
mises.
Ideal for department stores, small office buildings, fast
food chains, schools and hotels, a TEMP System is a
cost-effective way to maintain comfortable building
environments.
TEMP SYSTEM THERMOSTAT (WITHOUT TIMECLOCK)
39