Carrier 48ZT Specifications Page 79
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79
Gas Piping —
Unit is equipped for use with natural gas
only. Installation must conform with local building codes, or in
the absence of local codes, with the National Fuel Gas Code
(NFGC), ANSI Z223.1.
A
1
/
8
-in. NPT tapping plug, accessible for test gage connec-
tion, must be field installed immediately upstream of gas sup-
ply connection to unit, but after manual gas valve. See Fig. 93.
Natural gas pressure at unit gas connection must not be less
than 5 in. wg (1245 Pa) or greater than 13 in. wg (3235 Pa).
Size gas supply piping for 0.5 in. wg (124.5 Pa) maximum
pressure drop. Do not use supply pipe smaller than unit gas
connection.
Optional Staged Gas Control —
The 48Z030-105
large rooftop units may be ordered with an optional factory-
installed staged gas control system that monitors heating opera-
tion of the rooftop. The control system is composed of several
components as listed in sections below. Table 27 shows 48Z se-
ries Staged Gas implementation.
The staging pattern is selected based on Heat Stage Type
(HTSTGTYP). A limit switch is used for staged gas control.
Limit switch monitoring is configured with the LIMTMONI
point. The default is YES (use limit switch monitoring). Limit
switch thermistor default values are selected based on Limit
Switch Thermistor High Temp (LIMTHIHT) and Limit Switch
Thermistor Low Temp (LIMTLOHT). Max Capacity per
changes default value is selected based on CAPMXSTG. For
complete information and service instructions for Staged Gas
Control Units, see Control Operation and Troubleshooting
literature.
Table 27 — 48Z Series Staged Gas Implementation
LEGEND
Disconnect gas piping from unit when leak testing at pres-
sures greater than 0.5 psig (3448 Pa). Pressures greater than
0.5 psig (3448 Pa) will cause gas valve damage resulting in
a hazardous condition. If gas valve is subjected to pressure
greater than 0.5 psig (3448 Pa), it must be replaced.
IMPORTANT: An accessory field-supplied Navigator
display module is required for all staged gas control
units.
NO. OF
STAGES
MODEL NUMBER POSITION POINT
HEAT
SIZE
3 5 6,7,8 10 HTSTGTYP CAPMXSTG LIMTHIHT LIMTLOHT
2 stages
Z H, K, W, Y 030
035
040
050
Default=0 Default=45 Default=170 F Default=160 F Low
5 stages
Z J, L, X, Z 030
035
040
050
Default=1 Default=20 Default=170 F Default=160 F High
H, K, W, Y 055
060
070
Default=1 Default=20 Default=135 F Default=125 F Low
H, K 075
090
105
-,A,B
C,D,E
Default=1 Default=20 Default=135 F Default=125 F
H, K 075
090
105
G,H,J,K,L,M Default=1 Default=20 Default=130 F Default=120 F
9 stages
Z J, L, X, Z 055
060
070
Default=3 Default=15 Default=135 F Default=125 F High
J, L 075
090
105
-,A,B
C,D,E
Default=3 Default=15 Default=135 F Default=125 F
J, L 075
090
105
G,H,J,K,L,M Default=3 Default=15 Default=130 F Default=120 F
CAPMXSTG —
Maximum Capacity per Changes
HTSTGTYP —
Heat Stage Type
LIMTHIHT —
Limit Switch Thermistor High Temperature
LIMTLOHT —
Limit Switch Thermistor Low Temperature
*NPT plug is field supplied.
NOTE: Follow all local codes.
Fig. 93 — Gas Piping Details
- Installation, Start-Up and 1
- Service Instructions 1
- *Includes hood 12
- Drain Piping Details 34
- 48ZA,ZC,ZE,ZJ,ZL,ZR075-105 35
- 48ZT,ZV,ZW075-105 35
- 040-105 UNITS 35
- 030 AND 035 UNITS 35
- AIR HOOD 36
- PE VFD — 38
- Field Wire Routing 39
- Field Electrical Connections 39
- Air Pressure Tubing — 54
- ZL,ZR Units) — 56
- Fig. 55 — Shipping Brackets; 57
- Size 055-070 Units 57
- Compressor Mounting 58
- Install Accessories — 58
- COMPRESSOR MOUNTING FOOT 60
- COMPRESSOR MOUNTING RAIL 60
- COIL 62
- HEADER END 62
- CONTROLS INSTALLATION 63
- Constant Volume Units — 63
- Variable Air Volume Units — 63
- PIC Control Wiring — 66
- (Fig. 84) 67
- LEGEND 68
- Terminal Block 68
- Factory Wiring 68
- Field Wiring 68
- Fig. 75 — Remote Start 69
- Fig. 77 — Smoke Control 69
- CGCDXSEN003A00 70
- TRANSDUCER ACCESSORY 71
- Only) — 72
- Smoke Control Modes — 73
- 030-050 UNITS 75
- 055-105 UNITS 75
- ALL UNITS 77
- Gas Piping — 79
- PRE-START-UP 82
- System Check 82
- (Size 030-050 Units) 94
- (Size 055-070 Units) 94
- (Size 075-105 Units) 94
- COMPONENT LOCATION 96
- Economizer Hood 96
- Operating Sequences — 97
- SPEED CTRL 101
- RUN MODE 101
- ComfortLink 103
- HEAT EXCHANGER 105
- HOLDDOWN BOLTS 106
- DECREASE 108
- NULL DECREASE 108
- SET POINT 108
- Cleaning — 109
- Lubrication 109
- CHARGING CHART 112
- IGC Troubleshooting — 122
- Unit Wiring — 122
- LEGEND FOR FIG. 141-145 126
- Ta b 1 a 134
- START-UP CHECKLIST 135
- PRE-START-UP: 135
- START-UP 136
- ELECTRICAL 136
- TEMPERATURES 136
- PRESSURES 136
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