Trane Gas Unit Heaters Installation Manual Page 25
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25GBNE-SVX001A-EN
2. PROPANE GAS: An exact manifold pressure of 10.0
inches WC (2.5 kPa) must be maintained for proper
operation of the unit heater. If the unit is equipped with
a pressure regulator on the combination gas valve,
follow steps "a" through "d" above. If the unit is not
so equipped, the propane gas supply system pressure
must be regulated to attain this manifold operating
pressure.
3. The adjusted manifold pressure should not vary more
than 10% from pressure specified in Table 8.
Table 8 - Main Burner Orifice Schedule*
*
INPUT
IN
1000
BTU
2500 BTU/Ft
3
(93.1 MJ/m
3
)
PROPANETYPE OF GAS NATURAL
HEATING VALUE
1050 BTU/Ft
3
(39.1 MJ/m
3
)
3.5 INCH WC
(0.87kPA)
10 INCH WC
(2.49 kPA)
NUMBER
OF BURNER
ORIFICES
MANIFOLD
PRESSURE
4
5
6
7
8
9
10
11
12
100
125
150
175
200
250
300
350
400
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
FT
3
/HR
ORIFICE DRILL
93
42
116
42
140
42
163
42
186
42
233
42
280
42
326
42
372
42
40
53
50
53
60
53
70
53
80
53
100
53
120
53
140
53
160
53
*This schedule is for units at operating at normal altitudes of 2000 feet
(610m) or less.
When installed in Canada, any references to deration at altitudes in
excess of 2000 feet (610m) are to be ignored. At altitudes of 2000 to
4500 ft. (610 to 1372m), the unit heaters must be field derated to 90%
of the normal altitude rating, and be so marked in accordance with ETL
certification. See Table 8A for field deration information.
Check the gas input rate as follows (Refer to General Safety
Information section for metric conversions).
1. Turn off all gas appliances that use gas through the same
meter as the unit heater.
2. Turn the gas on to the unit heater.
3. Clock the time in seconds required to burn 1 cubic foot
of gas by checking the gas meter.
4. Insert the time required to burn one cubic foot of gas into
the following formula and compute the input rate.
3600 (Sec. per Hr.) X BTU/Cu. Feet
= Input Rate
Time (Sec.)
For example:
Assume the BTU content of one cubic foot of gas is 1000, and
that it takes 18 seconds to burn one cubic foot of gas.
3600 x 1000
= 200,000
18
NOTICE: If the computation exceeds, or is less than 95%
of the gas BTU/hr. input rating (see Table 1), adjust the gas
pressure.
Adjust the gas pressure as follows:
1. NATURAL GAS: Best results are obtained when the
unit heater is operating at its full rated input with the
manifold pressure of 3.5 inches WC (0.9 kPa). Adjustment
of the pressure regulator is not normally necessary since
it is preset at the factory. However, field adjustment may
be made as follows:
a. Attach manometer at the pressure tap plug adjacent
to the control outlet.
b. Remove the regulator adjustment screw cap, located
on the combination gas valve.
c. With a small screwdriver, rotate the adjustment screw
counterclockwise to decrease pressure, or clockwise
to increase pressure.
d. Replace regulator adjustment screw cap.
Operation (continued)
Primary Air Shutter Adjustment
Primary air adjustment is made at the factory. No field adjustments are necessary.
Gas Input Rate
CAUTION
Never overfire the unit heater, as this may cause unsatisfactory
operation, or shorten the life of the heater.
- Installation, Operation 1
- Table of Contents 2
- Description 3
- Model Number Description 4
- General Safety Information 5
- 6 GBNE-SVX001A-EN 6
- Installation 7
- Installation (continued) 10
- Blower Set Up and Adjustment 12
- Motor And Pulley 13
- Electrical Connections 14
- (continued) 15
- Venting Categories 19
- Venting (continued) 20
- Operation 24
- Operation (continued) 25
- Gas Input Rate 25
- 27GBNE-SVX001A-EN 27
- 28 GBNE-SVX001A-EN 28
- LED STATUS 29
- INDICATES CHECK/REPAIR 29
- Maintenance 30
- Limited Warranty 31
- 32 GBNE-SVX001A-EN 32
- (100/250 Unit Sizes Shown) 33
- (300/400 Unit Sizes Shown) 33
- Gas Equipment 34
- Start-Up 34
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