FHP EV Series Installation And Maintenance Manual - page 8
8
EV SERIES
9.
Increase the thermostat setting to approximately five (5)
degrees above the room temperature.
10.
Verify the heat pump is operating in the heating mode.
11.
Set the thermostat to maintain the desired space
temperature.
12.
Check for vibrations, leaks, etc…
13.
Instruct the homeowner on the unit and thermostat
operation.
IMPORTANT NOTES WHEN SERVICING
AN EV SERIES UNIT:
CAUTION: This system uses refrigerant R-410A which has
higher pressures than R-22 and other refrigerants. No other
refrigerant may be used in this system. Gage set, hoses, and
recovery system must be designed to handle R-410A.
The high pressure switch is set to open at 600 PSI. This is
much higher than the opening pressure in an R-22 unit.
The Compressors used in this product is specifically designed
for R-410A and that refrigerant's higher operating pressures. It
contains a polyolester lubricating oil that is compatible with
the new refrigerant. The required oil is Mobil EAL Arctic 22CC.
The polyolester (POE) oil is very hygroscopic, meaning it
absorbs water readily. POE oils can absorb 15 times as much
water as other oils designed for HCFC and CFC refrigerants.
Take all necessary precautions to avoid exposure of the oil to
the atmosphere.
Preventing moisture from entering the system should be a top
priority when servicing an EV series heat pump. To help do
this: Never leave the refrigerant system open to the
atmosphere for more than 15 minutes.
If the sealed refrigeration circuit must be opened for a service
procedure such as replacing a compressor or any other
refrigerant component, steps must be taken to minimize the
introduction of moisture into the refrigerant circuit.
The following procedure should be followed:
•
After recovering the refrigerant from the system, break
the vacuum with dry nitrogen. Use a regulator-equipped
nitrogen cylinder. Never exceed 5 PSI in the sealed
system.
This procedure "floods" the inside of the system with dry
nitrogen. Once the system is flooded, the defective
component can be cut from the system.
Residual nitrogen remaining in the system minimizes moisture
entry.
•
After removing the component from the system,
immediately seal the rest of the system with tape to
prevent any further introduction of moisture. Only remove
the tape when ready to install the replacement
component.
NOTE: Always replace the Bi-Flow liquid line filter drier when
opening the refrigerant circuit for servicing. Never install a
suction line drier in the liquid line. The rated working pressure
is not adequate for liquid line applications.
If the system is contaminated with moisture, the moisture
must be removed before putting the system back into
operation. Moisture that has not been absorbed by the POE
oil can only be removed by replacing the liquid-line drier.
Evacuating the system with a vacuum pump WILL NOT
remove moisture from the POE oil.
No special vacuum pump is required for R-410A.
The gauge manifold and hoses must be rated to handle the
higher pressures present with refrigerant R-410A. DO NOT
use a conventional gauge manifold or hoses to service this
product because they are not rated to handle the higher
pressures.
MAINTENANCE:
1.
Air
Filter changes or cleanings are required at regular
intervals. The time period between filter changes will
depend upon type of environment the equipment is used
in. In a single family home, that is not under construction,
changing or cleaning the filter every 60 days is sufficient.
In other applications such as motels, where daily
vacuuming produces a large amount of lint, filter changes
may need to be as frequent as biweekly.
W A R N I N G : Equipment should never be used during
construction due to likelihood of wall board dust accumulation
in the air coil of the equipment which permanently affects the
performance and may shorten the life of the equipment.
2.
A bi-yearly “checkup” is recommended by a licensed
refrigeration mechanic. Recording the performance
measurements of volts, amps, and water temperature
differences (both heating and cooling) is recommended.
This data should be compared to the information on the
unit’s data plate and the data taken at the original startup
of the equipment.
3.
Lubrication of the blower motor is not required, however
may be performed on some motors to extend motor life.
Use SAE-20 non-detergent electric motor oil.
4.
The condensate drain should be checked annually by
cleaning and flushing to insure proper drainage.
5.
Periodic lockouts almost always are caused by air or
water flow problems. The lockout (shutdown) of the unit
is a normal protective measure in the design of the
equipment. If continual lockouts occur call a mechanic
immediately and have them check for: water flow
problems, water temperature problems, air flow problems
or air temperature problems. Use of the pressure and
temperature charts for the unit may be required to
properly determine the cause.
OPTIONAL GROUND LOOP PUMPING PACKAGE:
An optional internally mounted ground loop pumping package
is available for the EV unit (Figure #10).
Before operating the unit it is imperative that the system be
purged of air and foreign material. This is accomplished by
flushing the loop in both directions with a high volume of water
at a high velocity. A flush cart and associated equipment will
be required for this operation. Please follow the steps outlined
below for proper flushing procedures:
1.
Connect the flush cart discharge to the LOOP PURGE IN
connection (see Figure #9) and the LOOP PURGE OUT
connection. Close valves BV2 and BV3, and open valves
BV1 and BV4. Liquid must be present in the supply lines
at all times.
2.
Flush the loop in both directions to ensure that all air and
foreign matter is eliminated. Allowing the water level to
drop below the pump inlet line on the flush cart will allow
air back into the loop. When air bubbles are no longer