Startup - Lennox HP29 Series Manual

DANGER
Do not attempt to backseat this valve past the
retaining ring. Attempts to backseat this valve past
the retaining ring will cause snap ring to explode
from valve body under pressure of refrigerant.
Personal injury and unit damage will result.
To Close Liquid Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and 5/16" hex head extension (part
#49A71) turn stem clockwise to seat the valve. Tighten
firmly.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
2 − Vapor Line Service Valve
HP29 units are equipped with a full service ball valve
shown in figure 15. The valve has one service port that
contains a valve core. A cap is provided to seal off the port
and prevent contamination.
Different manufacturers of valves may be used. All vapor
line service valves function the same way; differences are
in construction. If a valve fails it must be replaced.
To Access Service Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − When testing is completed, replace service port
cap. Tighten finger tight, then tighten an additional
1/6 turn.
To Open Vapor Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Back the stem out counterclockwise for a 1/4 turn.
3 − Replace stem cap and finger tighten, then tighten an
additional 1/6 turn.
To Close Vapor Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Turn stem in clockwise for 1/4 turn.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
VAPOR LINE SERVICE VALVE
USE ADJUSTABLE WRENCH
ROTATE STEM CLOCKWISE 90_ TO CLOSE
ROTATE STEM COUNTER CLOCKWISE 90_ TO OPEN
TO INDOOR COIL
SERVICE
PORT CAP
VALVE CORE
III−STARTUP
The following is a general procedure and does not apply to
all thermostat control systems. Refer to sequence of op
eration in this manual for more information.
Crankcase heaters must be energized for 24 hours
before attempting to start compressors. Set ther
mostat so there is no compressor demand before
closing disconnect switch. Attempting to start
compressors during the 24−hour warm −up period
could result in damage or failed compressors.
1 − Rotate the fan to check for frozen bearings or binding.
2 − Inspect all factory and field−installed wiring for loose
connections.
3 − Refer to section IV− to accurately charge and check
the charge on this unit.
4 − Check voltage supply at the disconnect switch. The
voltage must be within range listed on unit nameplate.
If not, do not start equipment until the power company
has been consulted and the voltage condition cor
rected.
5 − Set thermostat for a cooling demand, turn on power to
blower and close heat pump unit disconnect switch to
start.
6 − Recheck unit voltage with unit running. Power must be
within range shown on unit nameplate. Check amper
age draw of unit. Refer to unit nameplate for correct
running amps.
Page 14
STEM CAP
STEM
BALL
(SHOWN OPEN)
TO OUTDOOR COIL
SERVICE PORT
FIGURE 15
WARNING