Subject to change without notice.
7
PHH50–150G3
REV — 6/15/20
Panel Removal
The removable panels are secured with ¼ Turn
latches that are unlatched using a 3/16” Slotted
Standard screwdriver.
Heaters
The unit is a multiple stage heating system
supplied with a total of three heating banks. Each
heater bank is a tubular construction.
Thermostat
Each unit is supplied with a main thermostat that
is adjusted on the front of the control panel to
maintain the temperature within the enclosure
being controlled.
Discharge Air Thermostat
The unit is supplied with a discharge air thermostat.
The discharge air thermostat is located internal
to the control box directly behind the unit’s main
Thermostat and System ON/OFF Switch. This
switch prevents the discharge air temperature
from exceeding 160°F.
System ON/OFF Switch
Each unit is supplied with a Selector Switch (SS)
to turn ON/OFF the airflow and heating to the
space being conditioned.
Heater High Limit Switches
The unit has two 180°F heater high limit cutout
switches designed to shut the heaters down if the
temperatures rise above 180°F.
MAINTENANCE
Bearings
The Blower Motor and Blower Assembly bearings
are permanently lubricated and require no
lubrication.
Belts
The supply air blower is belt driven and are
provided with adjustable sheaves to change the
speed of the air flow (if required). The drive belts
should be examined periodically for wear and
for correct tension. If the belts are too tight it can
cause excessive motor and blower bearing wear
and a loose belt can cause belt slippage. When
the belts are pressed in, midway between the
pulley and the sheave, resulting in approximately
1” of movement, the belts are tensioned properly.
Belt tension can be adjusted by means of the
adjusting bolt, which requires loosening a nut to
move the motor to change belt position.
Filter Maintenance
The unit is shipped with cleanable filter(s) installed
in the return air section. The Panel Door under
the Control Section or side opposite the Control
Section must be removed to access the filters for
cleaning. Check filters every few weeks to verify
that the filters are clean and free of dust or dirt.
After a period of use, dirt, lint, and the original water
soluble adhesive coating are easily removed by
simply flushing the filter in a stream of luke-warm
water.
Apply a new coating of adhesive, such as RP Super
Filter Coat, to restore the filter characteristics.
