Carrier 48/50PD05 manual Gas Valve Adjustment, PuronR Refrigerant

The TXV is 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 OPERATING ON HIGH SPEED

	160
	140
F]
rees	120	Add Charge if Above the Curve
[Deg
erature,	100
Temp
eaving	80
L
utdoor Coil
					Remove Charge if Below the Curve
O	60
	40
	20
	150	200	250	300	350	400	450	500	550	600

Compre ssor Disc ha rge P re ssure , [psig]

C07040

Fig. 35 - Charging Chart ⎯ 48/50PD05

R410A REFRIGERANT

OUTDOOR FAN M UST BE OPERATING ON HIGH SPEED

	160
	140
F]
rees	120	Add Charge if Above the Curve
[Deg
erature,	100
Temp
eaving	80
L
utdoor Coil
					Remove Charge if Below the Curve
O	60
	40
	20
	150	200	250	300	350	400	450	500	550	600

Compre ssor Disc ha rge P re ssure , [psig]

C07041

Fig. 36 - Charging Chart ⎯ 48/50PD06

PuronR 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
(ft)	ORIFICE†	ORIFICE†
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.			48/50PD
Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input
reduction per each 1000 ft.
† 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.

C08663

Fig. 37 - 48PD Gas Valve

65