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Table 37—Perfect Humidity AdaptiveDehumidification System Sequence of Operation and
System Response — Single Compressor Unit (581C 024 --060, 581B 036-- 072)
THERMOSTAT INPUT ECONOMIZER FUNCTION 581B,C UNIT OPERATION
H Y1 Y2 OAT. < Economizer Set Point Economizer Comp. 1 Subcooling Mode Hot Gas Reheat Mode
Off — —
Normal Operation
On On On No Off On Yes No
On On Off No Off On Yes No
On On On Yes On On Yes No
On On Off Yes On On No Yes
On Off Off No Off On No Yes
NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.
LEGEND
OAT --- Outdoor Air Temperature
The net effect of the rooftop when in hot gas reheat mode is to
provide nearly all latent capacity removal from the space when
sensible loads diminish (when outdoor temperature conditions are
moderate). When in hot gas reheat mode, the unit will operate to
provide mostly latent capacity and extremely low sensible heat
ratio capability.
Similar to the subcooling mode of operation, hot gas reheat mode
operates only when the outside air temperature is warmer than
40_F. Below this temperature, a factory installed outside air
temperature switch will lockout this mode of operation.
SERVICE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
When sevicing unit, shut off all electrical power to unit
and install lockout tag.
!
WARNING
Step 1 —Cleaning
Inspect unit interior at the beginning of heating and cooling
season and as operating conditions require.
Evaporator
Coil
1. Turn unit power off, tag disconnect. Remove evaporator
coil access panel.
2. If economizer or two-position damper is installed, remove
economizer by disconnecting Molex plug and
removing mounting screws.
3. Slide filters out of unit.
4. Clean coil using a commercial c oil cleaner or dishwasher
detergent i n a pressurized spray canister. Wash both sides
of coil and flush with clean water. For best results,
back-flush toward return-air section to remove foreign
material. Flush condensate pan after completion.
5. Reinstall economizer and filters.
6. Reconnect wiring.
7. Replace access panels.
Condenser
Coil
Inspect coil monthly. Clean condenser coil annually, and as
required by location and outdoor air conditions.
One--Row Coils
Wa sh coil with commercial coil cleaner . It is not necessary to
remove top panel.
2-Row Coils
Clean coil as follows:
1. Turn off unit power, tag disconnect.
2. Remove top panel screws on condenser end of unit.
3. Remove condenser coil corner post. (See Fig. 47.) To hold
top panel open, place coil corner post between top panel
and center post. (See Fig. 48.)
C06044
Fig. 47 --- Cleaning Condenser Coil
C06045
Fig. 48 --- Propping Up Top Panel
581B,C