Quick Connect Coils; Precharged System Installation; System Start Up; Processing Checks - McQuay ACU018ARAY Installation And Maintenance Manual

QUICK CONNECT COILS

Precharged System Installation

Installation procedure will differ when condensing units are
provided for use with precharged refrigerant coils and lines.
Condensing units are provided with #6 and #11 male quick
connects instead of liquid and suction valves attached to cabi-
net to contain the R-22 charge that is sufficient for matching
evaporator coils and 15' of interconnecting lines.
Coils are provided with #6 and #11 male quick connects. Line
sets are required with #6 and #11 female quick connects on
both ends. Access ports are required in the fittings of both liq-
uid and suction lines at condenser end. Both coil and line sets
include R-22 holding charge only.
1. Connect lines to evaporator coil before connecting to the
condensing unit, locating access ports adjacent to condens-
ing unit.
a. Form tubing so it properly aligns with the coil connec-
tions.
b. Remove plugs and caps from connections.
c. Check to verify mating surfaces are clean.
d. Lubricate rubber seal with clean refrigerant oil and
thread couplings together by hand to verify they are not
cross threaded.
e. Tighten connections using backup wrench on stationary
fitting until coupling bottoms; then tighten 1/6 turn to
complete knife edge seal.
2. Connect lines to condensing unit in the same manner as to
evaporator coil. Observe same precautions.
3. After making all connections and opening valves, check all
piping for leaks.
IM-800

SYSTEM START UP

Processing Checks

Condensing units are supplied with R-22 charge sufficient for
typical matching evaporator and approximately 15' of inter-
connecting tubing. Condensing unit liquid and suction valves
are closed to contain the charge within the unit.
The recommended procedure for processing and charge adjust-
ment is as follows:
1. Connect vacuum pump to both base valve service ports.
2. Evacuate tubing and evaporator through liquid and suction
base valve ports, to 500 microns or less for a minimum of
30 minutes. Close valve to pump and wait 15 minutes.
Vacuum should not rise above 800 microns. If unable to
obtain 500 micorns, or vacuum rises above 800 microns
over a 15 minute period, discontinue evacuation, pressurize
and check for leaks. Repair any leaks found and repeat
step 2.
3. Close valve to vacuum pump and stop pump. Break vac-
uum by opening liquid and suction base valves. Fully open
base valves and remove pump lines. Connect service
gauges to verify lines are purged.
4. Set thermostat system switch to "COOL" and temperature
to highest setting. Close all disconnects.
5. Set thermostat to call for cooling. Check for operation of
indoor and outdoor fans. Allow for at least 10 minutes.
6. Check charge and adjust if necessary. Refer to appropriate
"Check Charge" section.
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