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EL16XC1 SERIES
STEP 5 -- UNIT START-UP
IMPORTANT
If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
1 - Rotate fan to check for binding.
2 - Inspect all factory- and field-installed wiring for loose
connections.
3 - After evacuation is complete, open the liquid line and
suction line service valve stems to release the refriger
ant charge (contained in outdoor unit) into the system.
4 - Replace the stem caps and tighten to the value listed
in table 2.
5 - Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted with the power company and the volt
age condition has been corrected.
6 - Connect manifold gauge set for testing and charging
using figure 11 as a guideline.
7 - Set the thermostat for a cooling demand. Turn on pow
er to the indoor indoor unit and close the outdoor unit
disconnect switch to start the unit.
8 - Recheck voltage while the unit is running. Power must
be within range shown on the unit nameplate.
9 - Check system for sufficient refrigerate using the pro
cedures outlined in under System Refrigerant.
OPERATING MANIFOLD GAUGE SET AND SERVICE
VALVES
The liquid and suction line service valves are used for re
moving refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a fac
tory-installed valve stem. Figures 14 and 15 provide infor
mation on how to access and operate both angle- and ball-
type service valves.
Torque Requirements
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are appro
priately tightened. Table 2 lists torque values for fasteners.
TABLE 2
TORQUE REQUIREMENTS
Parts Recommended Torque
Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #10 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
Using Manifold Gauge Set
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant sys
tems must be capable of handling the higher system oper
ating pressures. The gauges should be rated for use with
pressures of 0 - 800 psig on the high side and a low side of
30” vacuum to 250 psig with dampened speed to 500 psi.
Gauge hoses must be rated for use at up to 800 psig of
pressure with a 4000 psig burst rating.
BALL (SHOWN
CLOSED)
SERVICE PORT
CORE
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CAP
STEM CAP
VALVE
STEM
1 - Remove stem cap with an appropriately sized wrench.
2 - Use an appropriately sized wrenched to open. To open valve,
rotate stem counterclockwise 90°. To close rotate stem
clockwise 90°.
OPERATING BALL-TYPE SERVICE VALVE:
FIGURE 14
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
SERVICE PORT CORE
SERVICE PORT CAP
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
STEM CAP
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
1 - Remove stem cap with an appropriately sized wrench.
2 - Use a service wrench with a hex-head extension (3/16” for liquid
line valve sizes and 5/16” for suction line valve sizes) to back the
stem out counterclockwise as far as it will go.
When service valve is CLOSED, the service port is
open to the line set and indoor unit.
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
NOTE - A label with specific torque requirements may be affixed to the
stem cap. If the label is present, use the specified torque.
OPERATING ANGLE-TYPE SERVICE VALVE:
FIGURE 15
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