Step 5 -- Unit Start-Up - Lennox EL16XC1-018-230 Installation Instructions Manual

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.
Sheet metal screws 16 in.- lb.
Machine screws #10 28 in.- lb.
Compressor bolts 90 in.- lb.
Gauge port seal cap 8 ft.- lb.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
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.
1 - Remove stem cap with an appropriately sized wrench.
2 - Use an appropriately sized wrenched to open. To open valve,
1 - Remove stem cap with an appropriately sized wrench.
2 - Use a service wrench with a hex-head extension (3/16" for liquid
11 NM
2 NM
3 NM
10 NM
11 NM
NOTE - A label with specific torque requirements may be affixed to the
stem cap. If the label is present, use the specified torque.
Page 13
Using Manifold Gauge Set
OPERATING BALL-TYPE SERVICE VALVE:
rotate stem counterclockwise 90°. To close rotate stem
clockwise 90°.
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT
CAP
FIGURE 14
OPERATING ANGLE-TYPE SERVICE VALVE:
line valve sizes and 5/16" for suction line valve sizes) to back the
stem out counterclockwise as far as it will go.
SERVICE PORT CAP
SERVICE PORT CORE
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
STEM CAP
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
When service valve is CLOSED, the service port is
open to the line set and indoor unit.
FIGURE 15
BALL (SHOWN
CLOSED)
VALVE
STEM
STEM CAP
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
(FRONT-SEATED CLOSED)
EL16XC1 SERIES