Installation Guide

6
System Start Up
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service
valves until the top of the stem is 1/8” from the retainer.
CAUTION
When opening valves with retainers, open each valve only
until the top of the stem is 1/8” from the retainer. To avoid loss
of refrigerant, DO NOT apply pressure to the retainer. When
opening valves without a retainer remove service valve cap
and insert a hex wrench into the valve stem and back out the
stem by turning the hex wrench counterclockwise. Open the
valve until it contacts the rolled lip of the valve body.
NOTE: These are not back-seating valves. It is not necessary
to force the stem tightly against the rolled lip.
NOTE: Power must be supplied to the 18 SEER outdoor
units containing ECM motors before the power is applied
to the indoor unit. Sending a low voltage signal without
high voltage power present at the outdoor unit can cause
malfunction of the control module on the ECM motor.
Adequate refrigerant charge for the matching HSVTC evapo-
rator coil and 15 feet of lineset is supplied with the condens-
ing unit. If using evaporator coils other than HSVTC coil, it
may be necessary to add or remove refrigerant to attain proper
charge. If line set exceeds 15 feet in length, refrigerant should
be added at .6 ounces per foot of liquid line.
NOTE: Charge should always be checked using superheat
when using a piston and subcooling when using TXV equipped
indoor coil to verify proper charge.
Open the suction service valve first! If the liquid service valve
is opened first, oil from the compressor may be drawn into
the indoor coil TXV, restricting refrigerant flow and affecting
operation of the system.
After the refrigerant charge has bled into the system, open
the liquid service valve. The service valve cap is the second-
ary seal for the valves and must be properly tightened to pre-
vent leaks. Make sure cap is clean and apply refrigerant oil to
threads and sealing surface on inside of cap. Tighten cap
finger-tight and then tighten additional 1/6 of a turn (1 wrench
flat), or to the following specification, to properly seat the
sealing surfaces.
1. 3/8” valve to 5 - 10 in-lbs
2. 5/8” valve to 5 - 20 in-lbs
3. 3/4” valve to 5 - 20 in-lbs
4. 7/8” valve to 5 - 20 in-lbs
Do not introduce liquid refrigerant from the cylinder into the
crankcase of the compressor as this may damage the
compressor.
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service
valves until the top of the stem is 1/8” from the retainer.
CAUTION
1. Break vacuum by fully opening liquid and suction base
valves.
2. Set thermostat to call for cooling. Check indoor and out-
door fan operation and allow system to stabilize for 10
minutes for fixed orifices and 20 minutes for expansion
valves.
Charge Verification
REFRIGERANT UNDER PRESSURE!
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pres-
sure.
Failure to follow proper procedures may cause
property damage, personal injury or death.
WARNING
Use refrigerant certified standards. Used refrigerant
may cause compressor damage. Most portable machines
cannot clean used refrigerant to meet tandards.
to AHRI
AHRI s
CAUTION
NOTICE
Violation of EPA regulations may result in fines or other
penalties.
CAUTION