Carrier 50PD05 Operating And Service Instructions page 65

TheTXVis set
to maintain between 10 and 15 degrees of
superheat at the compressors. The valves are factory set and cannot
be adjusted. Do not use A TXV designed for use with R-22.
R410A REFRIGERANT
OUTDOOR FAN M UST BE OPERA TING ON HIGH SPEED
160
140
120
lOO
80 ¸
60
20
150 200 250 300 350 400 450 500 550
Compressor Discharge Pressure, [psig]
160
Fig. 35 - Charging Chart-- 48/50PD05
R410A REFRIGERANT
OUTDOOR FAN M UST BE OPERA TING ON HIGH SPEED
6OO
(07040
140
120
lOO
80 ¸
60
20
150 200 250 300 350 400 450 500 550 600
Compressor Discharge Pressure, [psig]
Fig. 36 - Charging Chart 48/50PD06
(07041
Puron®
Refrigerant
Puron refrigerant operates at 50 to 70 percent higher pressures than
R-22. Be sure that servicing equipment and replacement
components are designed to operate with Puron refrigerant. Do not
mix with components that have been used with other refrigerants.
Puron refrigerant, as with other HFCs, is only compatible with
POE oils.
Recovery cylinder service pressure rating must be 400 psig. Puron
systems should be charged with liquid refrigerant. Use a
commercial-type metering device in the manifold hose. Manifold
sets should be 750 psig high-side and 200 psig low-side with 520
psig low-side retard. Use hoses with 750 psig service pressure
rating. Leak detectors should be designed to detect HFC
refrigerant.
Table 26 -- Altitude Compensation*
48PG03-07
ELEVATION NATURAL GAS PROPANE
(It) ORIFICEt ORIFICEt
0-1,999 45 52
2,000 47 52
3,000 47 53
4,000 47 53
5,000 48 53
6,000 48 53
7,000 48 53
8,000 49 54
9,000 49 54
10,000 50 54
11,000 51 54
12,000 51 55
13,000 52 55
14,000 52 56
*As the height above sea level increases, there is less oxygen per cubic foot of air.
Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input
reduction per each 1000 ft.
t Orifices available through your Carrier dealer.
Gas Valve Adjustment
The gas valve opens and closes in response to the thermostat or
limit control.
When power is supplied to valve terminals W2 (High Fire) and C1,
the main valve opens to its preset position.
The regular factory setting is stamped on the valve body.
To adjust regulator:
1. Set unit at setting for no call for heat.
2. Turn main gas valve to OFF position.
3. Remove 1/8-in. pipe plug from manifold pressure tap
connection. Install a suitable pressure-measuring device.
4. Set main gas valve to ON position.
5. Set thermostat at setting to call for heat.
6. Remove screw cap covering regulator adjustment screw.
(See Fig. 37.)
7. Turn adjustment screw clockwise to increase pressure or
counterclockwise to decrease pressure. The setting is 3.50
in. wg on sizes 03-14 and 3.00 on size 16-28.
8. Once desired pressure is established, set unit setting for no
call for heat, turn off main gas valve, remove
pressure-measuring device, and replace 1/8-in. pipe plug and
screw cap.
HIGH REGULATOR
ADJUSTMENT SCREW
LOW REGULATOR
ADJUSTMENTSCREW
OUTLETPRESSURE
HI (W2) MALE
INLET PRESSURE MAIN (Wl) MALE SPADE TERMINAL
TAP (PLUGGED) SPADE TERMINAL
Fig. 37 - 48PD Gas Valve
(08663
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