Gas Valve Adjustment (48Pd Units Only) - Carrier 48/50PD05 User Manual

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 RE R4
OUTDOOR F R FAN M N M UST BE OPERATING ON H
16 160
14 140
Add dd Cha harge if Abov bove the the Cur urve
120 12
10 100
80 80
60 60
40 40
20 20
150 150 200 200 25 250 300 00
Co mp re ss ssor Disc
Fig. 35 - - Charging Chart ⎯ 48/50PD05
R410A RE R4
OUTDOOR F R FAN M N M UST BE OPERATING ON H
16 160
14 140
Add dd Cha harge if Abov bove the the Cur urve
120 12
100 10
80 80
60 60
40 40
20 20
150 150 200 200 250 25 300 00
Co mp re ss ssor Disc
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.
REFRI RIGERANT RANT
N HIGH S H SPEED
Rem ove ve Ch Char arge if if Belo low the Cu Curve ve
350 350 400 400 450 450 500 500 550 550 600 600
isc h a rg e P re ss ssu re , [p sig sig]
REFRI RIGERANT RANT
N HIGH S H SPEED
Rem ove ve Ch Char arge if if Belo low the Cu Curve ve
350 350 400 400 450 450 500 500 550 550 600 600
isc h a rg e P re ss ssu re , [p sig sig]
Table 26 — Altitude Compensation*
ELEVATION
(ft)
0-1,999
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000
*
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.
†
Orifices available through your Carrier dealer.
Gas Valve Adjustment
The gas valve opens and closes in response to the thermostat or
C07040
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.
1
3. Remove
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
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
screw cap.
C07041
65
48PG03- -07
NATURAL GAS
ORIFICE†
45
47
47
47
48
48
48
49
49
50
51
51
52
52
/ -in. pipe plug from manifold pressure tap
8
1
/
Fig. 37 - - 48PD Gas Valve
PROPANE
ORIFICE†
52
52
53
53
53
53
53
54
54
54
54
55
55
56
or
-in. pipe plug and
8
C08663