Carrier 48TC 04 Series Service And Maintenance Instructions page 46

Table 9 – Quantity of Heating Stages
MODELS SIZES
04--- 06
07
48TCD, S
08--- 09
12--- 16
04
05--- 06
48TCE, R
07
08--- 16
04
05--- 06
48TCF,T
07
08--- 16
48TCL, M 04--- 06
04
48TCN
05--- 06
LIMIT SWITCH
AND SHIELD
Fig. 56 - - SRT Limit Switch Location
Fuel Types and Pressures
Natural Gas — The 48TC unit is factory- - equipped for
use with Natural Gas fuel at elevation under 2000 ft (610
m). See section Orifice Replacement for information in
modifying this unit for installation at elevations above
2000 ft (610 m).
Gas line pressure entering the unit's main gas valve must
be within specified ranges. Adjust unit gas regulator valve
as required or consult local gas utility.
Table 10 – Natural Gas Supply Line Pressure Ranges
MODEL SIZES
04--- 14
48TC
16
Manifold pressure is factory- - adjusted for NG fuel use.
Adjust as required to obtain best flame characteristic.
3---PH 1---PH
1 1
1 NA
1 NA
2 NA
2 1
1 1
2 NA
1 NA
NA NA
2 1
2 NA
2 NA
1 1
NA NA
1 1
C12061
MIN MAX
4.0 in. wg 13.0 in. wg
(996 Pa) (3240 Pa)
5.0 in. wg 13.0 in. wg
(996 Pa) (3240 Pa)
DOWN SHOT
LIMIT SWITCH
Fig. 57 - - Limit Switch Location
Table 11 – Natural Gas Manifold Pressure Ranges
LOW
UNIT SIZES
FIRE+
04--- 07
NA
08--- 09
2.0
48TCD
12--- 14
(498 Pa)
48TCS
2.0
16
(498 Pa)
1.7 +
04--- 07
(423 Pa)
2.0
08--- 09
48TCE
(498 Pa)
48TCR
2.0
12--- 14
(498 Pa)
16 2.0
05--- 07 1.7
48TCF
08--- 14 2.0
48TCS
16 2.0
48TCL
48TCM
All NA
48TCN
+: Size 04 only
NA: Not Available
Liquid Propane — Accessory packages are available for
field- - installation that will convert the 48TC unit (except
low NOx model) to operate with Liquid Propane (LP)
fuels. These kits include new orifice spuds, new springs
for gas valves and a supply line low pressure switch. See
section on Orifice Replacement for details on orifice size
selections.
Low NOx models include specially- - sized orifices and use
of different flue flow limits and tube baffles. Because of
these extra features, conversion of these models to LP is
not recommended.
Fuel line pressure entering unit gas valve must remain
within specified range.
46
SIDE SHOT
LIMIT SWITCH
C12592
HIGH
RANGE
FIRE
3.5 in. wg
(872 Pa)
3.5
2.0--- 5.0 in. wg (Hi)
(872 Pa)
(498--- 1245 Pa)
3.0
(747 Pa)
3.5
(872 Pa)
3.5
2.0--- 5.0 in. wg (Hi)
(872 Pa)
(498--- 1245 Pa)
3.5
(872 Pa)
3.0
3.5
3.5
2.0--- 5.0 in. wg (Hi)
3.0
(498--- 1245 Pa)
3.5 in. wg
(872 Pa)