GSZ16 Service Manual

ManualsBrandsGoodman ManualsGSZ Heat Pumps R410A RefrigerantGSZ 2.5 Ton 16 SEER High-Efficiency Split System Heat Pump w/ R410A Refrigerant

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SERVICING

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S-120 REFRIGERANT PIPING

The piping of a refrigeration system is very important in relation

to system capacity, proper oil return to compressor, pumping

rate of compressor and cooling performance of the evaporator.

POE oils maintain a consistent viscosity over a large tempera-

ture range which aids in the oil return to the compressor;

however, there will be some installations which require oil

return traps. These installations should be avoided whenever

possGible, as adding oil traps to the refrigerant lines also

increases the opportunity for debris and moisture to be

introduced into the system. Avoid long running traps in

horizontal suction line.

S-201 CLEANING ALUMINUM COILS

This unit is equipped with an aluminum tube evaporator coil. The

safest way to clean the evaporator coil is to simply flush the coil

with water. This cleaning practice remains as the recommended

cleaning method for both copper tube and aluminum tube resi-

dential cooling coils.

An alternate cleaning method is to use one of the products listed

in the technical publication TP-109 (shipped in the literature bag

with the unit) to clean the coils. The cleaners listed are the only

agents deemed safe and approved for use to clean round tube

aluminum coils. TP-109 is available on the web site in Partner

Link > Service Toolkit.

NOTE: Ensure coils are rinsed well after use of any chemical cleaners.

S-202 DUCT STATIC PRESSURES AND/OR STATIC PRES-

SURE DROP ACROSS COILS

This minimum and maximum allowable duct static pressure for

the indoor sections are found in the specifications section.

Tables are also provided for each coil, listing quantity of air

(CFM) versus static pressure drop across the coil.

Too great an external static pressure will result in insufficient air

that can cause icing of the coil. Too much air can cause poor

humidity control and condensate to be pulled off the evaporator

coil causing condensate leakage. Too much air can also cause

motor overloading and in many cases this constitutes a poorly

designed system.

S-203 SINGLE PIECE AIR HANDLER EXTERNAL STATIC

To determine proper airflow, proceed as follows:

1. Using a Inclined Manometer or Magnehelic gauge , measure

the static pressure of the return duct at the inlet of the air

handler, this will be a negative pressure (for example-.30"wc)

2. Measure the static pressure of the supply duct at the outlet

of the air handler, this should be a positive pressure (for

example .20"wc).

3. Add the two readings together (for example -.30"wc + .20"wc

= .50"wc total external static pressure.

NOTE: Both readings may be taken simultaneously and read

directly on the manometer if so desired.

4. Consult proper air handler airflow chart for quantity of air

(CFM) at the measured external static pressure.

+ .20” wc

- .30” wc

S-203A TWO PIECE AIR HANDLER EXTERNAL STATIC

PRESSURE

To determine proper airflow, proceed as follows:

1. Using a Inclined Manometer or Magnehelic gauge, measure

the static pressure between the outlet of the evaporator coil

and the inlet of the air handler, this will be a negative pressure

( for example -.30"wc)

2. Measure the static pressure of the supply duct at the outlet

of the unit, this should be a positive pressure (for example

.20"wc).