A caution – Carrier 38AQ034 User Manual
Page 7
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To Charge System
— Refer to Carrier Standard
Serviee
Teehniques
Manual,
Chapter
1
and
the
pro-
eedures
described
below.
Use
Fig.
8
for
charging
any
40RR/38AQ024
combination;
Fig.
9
for
charging
any
40RR/38AQ028
combination;
and
Fig.
10
for
charging
any 40RR/38AQ034 combination.
A CAUTION
Charge unit in cooling mode only.
Charging unit
in heating mode could result in overcharging.
1. Use Refrigerant R-22 only.
2.
Regulate refrigerant drum valve to maintain suction
pressure at 80 psig while charging. Charge with vapor
only at suction side of unit.
NOTE: Do not depend on sight glass when charg
ing unit. Use charging chart.
3.
Allow system to operate for 20 minutes.Take tem
perature and pressure readings at liquid service valve
and check values with the charging chart.
4.
Measure liquid line temperature close to the liquid
service valve, and the pressure at the Schrader port on
the liquid line service valve. Plot point on the charging
chart. If point is above the line, add charge. If point
is below the line, remove charge until operating point
falls on the line.
5. Record final refrigerant charge on unit nameplate.
To Start Unit — After compressor crankcase
heater has been on for at least 24 hours,
set room
thermostat so unit will start on desired mode.
HEATING
—
Place
thermostat
selector
at
HEAT
and
set temperature selector above room ambient.
COOLING
—
Place
thermostat
selector
at
COOL
and
set temperature selector below room ambient.
NOTES:
1. All 3 outdoor fans must be operating
2 To be used with approved 40RR combinations only.
3. Applies to all approved combinations
Fig. 9 — Cooling Cycle Charging Chart, 40RR/38AQ028
7