12
Defrost Timer Setting
Turbo air uses 8145-20B type timer made by
Paragon company.
Timer should be set correctly. Determine the
number of defrosts per day and the best time of
day for it to occur. Insert pins accordingly. Set the
fail-safe time to terminate the defrost a few
minutes beyond the estimated temperature
termination time. Air defrost termination time is
usually 30 to 50 minutes. The colder the room, the
longer the fail-safe time required. Electric defrost
systems normally have a 25 to 40 minute fail-safe
time.
Head Pressure Control
A. Head Pressure Control Valve System (Standard Models)
The standard valve used on high pressure refrigerant systems controls the head pressure at approximately
180 PSIG.
B. Fan Cycle Pressure Control System (Model “-A”)
Pressure Settings
Evaporator Temp.Range
Fan No
Pressure Switch 1 (PSIG)
Pressure Switch 2 (PSIG)
OFF
ON
OFF
ON
High (40 to 0 °F)
1, 2
157
228
-
-
Extended (30 to -25 °F) & Extra
Low (0 to -40 °F)
1
-
-
100
157
2
157
228
100
157
Locating and Mounting Condensing Unit
Locating Condensing Unit.
Condensing Unit must be located and installed
where there is an unrestricted area. Avoid areas
where there are corrosive vapors or flammable
materials.
Avoid locating units too close to walls. Fan intake
and discharge air space should be at least 1m and
2m from wall. Other sides should be at least 0.5m
from wall. No impediments should be located in
front of condensing units intake and discharge.
If above is not followed correctly noise and
inadequate air flow may result.
Condensing units should be located away from
general public and the street.
Make sure units are kept horizontal.
