S-201 Checking Temperature Rise - Goodman GPH13 Service Instructions Manual

SERVICING
2. Measure the static pressure of the supply duct, (Positive
Pressure).
3. Add the two readings together.
NOTE: Both readings may be taken simultaneously and read
directly on the manometer as shown in the illustration above, if
so desired.
4. Consult proper table for quantity of air.
If the external static pressure exceeds the minimum or maxi-
mum allowable statics, check for closed dampers, dirty filters,
undersized or poorly laid out ductwork.

S-201 CHECKING TEMPERATURE RISE

Temperature rise is related to the BTUH output of the unit and
the amount of air (CFM) circulated over the indoor coil.
All units are designed for a given range of temperature increase.
This is the temperature of the air leaving the unit minus the
temperature of the air entering the unit.
The more air (CFM) being delivered through a given unit the
less the rise will be; so the less air (CFM) being delivered, the
greater the rise. The temperature rise should be adjusted in
accordance to a given unit specifications and its external static
pressure.
40
1. Take entering and leaving air temperatures.
2. Select the proper speed tap from the unit's blower perfor-
mance data in the Technical Manual for the specific unit.
3. Take motor amperage draw to determine that the motor is
not overloaded during adjustments.
Checking Temperature Rise
T
T
T T
RISE = SUPPLY -