Nagas DTHR Series, Installation And Operation Manual

Page: 5 / 47

4
Installation and operation manual – DTHR-V9-2020
Electrical supply: 120VAC / 1ph/60Hz –
(from 4 to 15 Amp. Refer to name plate for specific value)
Notes:
1
. Intended for a temperature rise of 50°F to 120°F (28°C to 67°C)
- 1 MBTU: 1000 BTU/ Hr
- CFM: Cubic foot per minute
- Ratings are based on 1000 Btu/ft
3
for natural gas and 2500 Btu/ft
3
for propane at sea level. Reduce burner
capacity for altitude over 2000ft by 4% for each 1000ft above sea level.
Important
All gas piping must be performed by a qualified personel following the local codes and CSA B149.1
installation code for Canada or ANSI Z223.1/NFPA 54 for the United States.
*: With 10’’w.c. minimum inlet pressure.
**: With optional 2’’ NPT gas train for 7’’w.c. inlet pressure. The vent must be piped to outdoor.
***: To be used in ventilated space only. In other case the regulator vent must be piped to outdoor. Use ½’’ NPT tubing.
Note:
•
This table should not be used to size the site gas supply line.
•
If supply gas pressure exceeds 14 inches w.c., a high-pressure regulator must be installed at gas piping
inlet. The regulator must be suitable for modulation ratio of 40:1 to properly regulate gas pressure at
low fire.
•
The regulator vent must be piped separately towards the outside of the building as stated by CSA B149.1
for Canada and ANSI Z223 for USA and local codes.
DTHR
Model
Input capacity Output capacity
Turndown
ratio
Air flow
1
MBTU kW MBTU kW
CFM kW
Min. Max. Min. Max.
35
438 128 350 102 15:1 2701 6481 1275 3059
40
500 143 400 117 17:1 3086 7407 1457 3496
50
625 183 500 146 21:1 3858 9259 1821 4370
55
688 201 550 161 17:1 4247 10193 2004 4810
65
813 238 650 190 20:1 5019 12054 2368 5684
75
938 275 750 220 23:1 5790 13896 2733 6558
85
1063 311 850 249 27:1 6562 15748 3097 7432
100
1250 366 1000 293 31:1 7716 18519 3642 8740
125
1563 458 1250 366 26:1 9645 23148 4552 10925
150
1875 549 1500 439 31:1 11574 27778 5462 13110
Dim
Gas train connections (NPT)
Model
35 40 50 55 65 75 85 100 125 150* 150**
Ø Gas 1 1 1 1 1 1 1-1/2 1-1/2 1-1/2 1-1/2 2
Ø Regulator Vent***
N/A: Vent limiter factory installed
***
1/2
Ø Vent valve
N/A: Valve proving system included with IRI gas train option.
Specifications
Gas supply