Installation guide
START-UP
Preliminary Checks
1. Check that all internal wiring connections are tight and that
all barriers, covers, and panels are in place.
2. Field electrical power source must agree with unit name-
plate rating.
3. All service valves must be open.
4. Belly-band crankcase heater must be tight on compressor
crankcase for those units with belly-band heaters.
Leak Test
Field piping and fan coil must be leak tested by pressure method.
Use Puron ® refrigerant at approximately 25 psig backed up with an
inert gas to a total pressure not to exceed 245 psig.
NOTE: Leak detectors should be designed to detect HFC
(hydroflourocarbon) refrigerant.
Evacuate and Dehydrate
Field piping and fan coil must be evacuated and dehydrated.
Charge System
Release charge into system by opening (backseating) liquid and
suction line service valves.
Refrigerant Char_in_
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in personal
injury and/or equipment damage.
Wear safety glasses and gloves when handling
refrigerant. Do not overcharge system - this can cause
compressor flooding.
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in personal
injury and/or equipment damage.
Service valves must be fully backseated to close service
port. There is no Schrader valve at the service port, and
failure to backseat the valve could result in loss of
system charge or personal iniury.
NOTE: Do not vent or de-pressurize unit refrigerant to
atmosphere. Remove and recover refrigerant following accepted
practices.
All units are shipped with the refrigerant charge listed on the
nameplate.
The recommended procedure for charging is the "weigh-in"
method. If using the subcooling method, use 12 ° for the desired
subcooling temperature.
Refer to Table 1 and consider the following when working with
Puron ® refrigerant:
• Puron refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig,
DOT (Department of Transportation) 4BA400 or DOT BW400.
• Puron systems should be charged with liquid refrigerant. Use a
commercial type metering device in the manifold hose when
charging into suction line with compressor operating.
• Manifold sets should be 700 psig high side and 180 psig low
side with 550 psig low-side retard.
• Use hoses with 700 psig service pressure rating.
• Puron refrigerant, as with other HFCs, is only compatible with
POE oils.
• Vacuum pumps will not remove moisture from oil.
• Polyol Ester oils absorb moisture rapidly. Do not expose oil to
atmosphere.
• Polyol Ester oils may cause damage to certain plastics and
roofing materials.
• Wrap all filter driers and service valves with wet cloth when
brazing.
• Factory approved, liquid-line filter drier is required on every
unit.
• If using a suction line drier, do not leave in place for more than
72 hours.
NOTE: Unit is shipped with a minimum factory charge. For
different fan coils, see Charge Adjustment in Table 1. For line
length beyond 80 ft. (24.4 m), see the Duct Free Split Systems
Long Line Guide.
To Start Unit
Be sure that the field disconnect is closed. Set room thermostat
below ambient temperature. Operate unit for 15 minutes, then
check system refrigerant charge. See Refrigerant Charging section.
NOTE: When using in coniunction with 40QA fan coils, refer to
start-up instructions included with fan coil for correct start-up
procedures.
SERVICE
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
iniury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
Outdoor Fan
A reinforced wire mount holds the outdoor fan assembly in
position, See Fig, 8 for proper mounting position,
I I [_ .......... _ FAN BLADE
-LL_.<d t
OUTSIDEEDGEOF OUTSIDEEDGE DIMENSIONFROM
FANDECK OF GRILLE OUTSIDETOP EDGEOF
BLADETO OUTSIDEEDGE
OF FAN DECK.SEETABLE
BELOW
38QRF Unit Size, in. (mm)
018,024 030,035,036
0.433 (11.00) 0
A07401
Fig. 8 - Condenser Fan Mounting Positions
High-Pressure Relief Valve
The high-pressure relief valve is located in the compressor. The
relief valve opens at a pressure differential of approximately 550 to