Start−Up; Charging - Lennox HS40 Series Installation Instructions Manual

2 −The nitrogen holding charge in the unit must be re
leased. Open both manifold valves to release the nitro
gen from the unit. See page 5 for service valve opera
tion.
3 −Connect the vacuum pump (with vacuum gauge) to the
center port of the manifold gauge set.
4 −Open both manifold valves and start vacuum pump.
5 −Evacuate the line set, condensing unit, and indoor unit
to an absolute pressure of 23 mm (23,000 microns) of
mercury. During the early stages of evacuation, it is de
sirable to close the manifold gauge valve at least once
to determine if there is a rapid rise in absolute pres
sure. A rapid rise in pressure indicates a relatively
large leak. If this occurs, the leak testing procedure
must be repeated.
NOTE − The term absolute pressure means the total
actual pressure within a given volume or system,
above the absolute zero of pressure. Absolute pres
sure in a vacuum is equal to atmospheric pressure mi
nus vacuum pressure.
6 −When the absolute pressure reaches 23 mm (23,000
microns) of mercury, close the manifold gauge valves,
turn off the vacuum pump and disconnect the manifold
gauge center port hose from vacuum pump. Attach the
manifold center port hose to a nitrogen cylinder with
pressure regulator set to 150 psig (1034 kPa) and
purge the hose. Open the manifold gauge valves to
break the vacuum in the system. Close the manifold
gauge valves.
WARNING
Danger of Equipment Damage.
Avoid deep vacuum operation. Do not use com
pressors to evacuate a system.
Extremely low vacuums can cause internal arcing
and compressor failure.
Damage caused by deep vacuum operation will
void warranty.
7 −Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold
gauge valves to release the nitrogen from the system.
8 −Reconnect the manifold gauge to the vacuum pump,
turn the pump on and continue to evacuate the system
until the absolute pressure does not rise above .5 mm
(500 microns) of mercury within a 20−minute period after
shutting off the vacuum pump and closing the manifold
gauge valves.
9 −When the absolute pressure requirement from step 9
has been met, disconnect the manifold gauge hose
from the vacuum pump. Then, weigh in a LIQUID
charge of R407C through the liquid and suction service
valves.
Refer to the unit nameplate for the correct liquid charge.
If you can not measure in the total amount, refer to the
start−up section and set the final system charge accord
ing to the charging instructions. The R407C refrigerant
cylinder should be chocolate brown.
Start−Up
1 − Rotate the fan to check for frozen bearings or binding.
2 − Inspect all factory and field−installed wiring for loose
connections.
3 − 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.
4 − Set thermostat for a cooling demand, turn on power to
blower and close condensing unit disconnect switch to
start.
5 − 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.

Charging

Charge the unit with the amount of liquid R407C refrigerant
that is indicated on the unit namplate. This charge is based
on a matching indoor coil and outdoor coil with 4.6 m line
set. For varying lengths of line set, refer to table 2 for refrig
erant charge adjustment.
Liquid Line Set Diameter
5/16 in. (8 mm)
3/8 in. (10 mm)
*If line length is greater than 4.6 m, add this amount. If line
length is less than 4.6 m, subtract this amount.
IMPORTANT
Mineral oils are not compatible with R407C. If oil
must be added, it must be a polyol ester oil.
The compressor is charged with sufficient polyol ester
oil for line set lengths up to 15 m. If line set lengths lon
ger than 15 m will be required, add 1 ounce (28 gm) of oil
for every additional 3 m of line set. Do not add any more
than 207 ml of oil. Copeland has approved Mobil EALt
Arctic 22CC and ICI EMKARATEt RL32CF for use with
these compressors when oil must be added in the field.
The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best results,
the indoor temperature must range from 21°C to 26°C. Be
sure to monitor system pressures while charging.
Page 8
TABLE 2
Grams per 1.5 m adjust
from 4.6 m line set*
57 g per 1.5 m
85 g per 1.5 m