Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 18)

Form I-PDH/SDH/PEH/SHH/PXH, Page 18
CAUTION: DO NOT
bottom out the gas
valve regulator
adjusting screw.
This can result
in unregulated
manifold pressure
causing excess
overfire and heat
exchanger failure.
High Altitude Capacity
Changes
The input and/or the capacity of the heater changes with altitude.
TABLE 11A lists inputs and capacities at altitudes from sea level to 9,000 ft (2745M)
for Models PDH and SDH installed in the U.S. and to 4,500 ft (1373M) for Canadian
installations.
TABLE 11B lists inputs and capacities for Model SHH.
TABLE 11A - BTUH Inputs and Capacities by Altitude for Models PDH and SDH
Instructions for High Altitude Derate (cont’d) 6.0 Mechanical
(cont’d)
6.1 Gas Heat
Section Piping
and Pressure
- Models PDH,
SDH, and SHH
(cont’d)
3. Single-Stage and Two-Stage High Fire Adjustment - Turn the knob or switch on
the top of the valve to “ON”. Remove the cap from the pressure adjusting screw
and adjust the outlet pressure to the full rate pressure selected from TABLE 10.
Two Stage Low Fire - Disconnect the wire from the “HI” terminal on the gas valve
and check low fire pressure. To adjust, turn the low pressure regulator screw to
achieve the “2-Stage Low Fire” pressure listed for the applicable gas control
(TABLE 10). Re-connect the wire to the gas valve.
Electronic Modulation Options AG40, DG2, DG6, and D12B - The electronic
modulation valve itself has no high fire adjustment. The only adjustment on the
modulation valve is the low-pressure bypass setting which is factory set and does
not require field adjustment for high altitude operation.
However, if the elevation on the rating plate does not match the elevation of the
installation, a full rate adjustment is required at the outlet of the combination valve.
To make the full rate adjustment, adjust the outlet pressure of the combination gas
valve when the modulating valve is fully open (there must be a minimum of a 20
VDC signal at the electronic modulating valve to ensure that it is fully open). Set
the outlet pressure of the combination valve to the pressure shown in TABLE 10.
4. Turn up the thermostat. (NOTE: On Model SDH and SHH, depress and hold the
door safety switch.) Cycle the burner once or twice to properly seat the adjustment
spring in the valve.
Re-check the pressure(s). When the outlet pressure(s) is right for the installation,
remove the manometer and replace the cap. Check for leak at the pressure tap fit-
ting.
5. With the heater operating, determine that the inlet (supply) pressure to the heater
for natural gas is between 5 inches w.c. (or as noted on the rating plate) and
14 inches w.c. and for propane between 11 and 14 inches w.c. Take this reading
as close as possible to the heater. (Heaters are equipped with a gas valve that
has an inlet pressure tap.) If the inlet (supply) pressure is not within the specified
range, the inlet (supply) pressure must be corrected and Steps 3 and 4 repeated.
6. Find the High Altitude Adjustment label in the literature bag that contained these
instructions. Using a permanent marker, fill-in the appropriate information from
TABLE 11A or 11B. Affix the label to a clean, dry, and conspicuous location on the
outside of the heater access panel.
ALTITUDE
Normal
Input
Thermal
Output
Capacity
2-Stage
Minimum
Input
(applies to
AG2, AG3,
AG15,
AG16)
2-Stage with Venter
Motor Controller
Minimum Input
(applies to AG60,
AG61, AG62, DG1,
DG5, D12C)
Modulation
Minimum Input
(applies to Options
AG8, AG9, AG9H,
AG40, DG2, DG6,
D12B)
Normal
Input
Thermal
Output
Capacity
2-Stage
Minimum
Input
(applies
to AG2,
AG3, AG15,
AG16)
2-Stage with Venter
Motor Controller
Minimum Input
(applies to AG60,
AG61, AG62, DG1,
DG5, D12C)
Modulation
Minimum Input
(applies to Options
AG8, AG9, AG9H,
AG40, DG2, DG6,
D12B)
Normal
Input
Thermal
Output
Capacity
2-Stage
Minimum
Input
(applies to
AG2, AG3,
AG15,
AG16)
2-Stage with Venter
Motor Controller
Minimum Input
(applies to AG60,
AG61, AG62, DG1,
DG5, D12C)
Modulation
Minimum Input
(applies to Options
AG8, AG9, AG9H,
AG40, DG2, DG6,
D12B)
Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane
Feet Meters Size 75 Size 100 Size 125
0-2000 0-610 75,000 60,750 52,500 24,750 30,000 18,750 30,000 100,000 81,000 70,000 33,000 40,000 25,000 40,000 125,000 101,250 87,500 41,250 50,000 31,250 50,000
2001-3000 611-915 70,500 57,105 49,350 23,265 28,200 17,625 28,200 94,000 76,140 65,800 31,020 37,600 23,500 37,600 117,500 95,175 82,250 38,775 47,000 29,375 47,000
3001-4000 916-1220 69,000 55,890 48,300 22,770 27,600 17,250 27,600 92,000 74,520 64,400 30,360 36,800 23,000 36,800 115,000 93,150 80,500 37,950 46,000 28,750 46,000
4001-5000 1221-1525 67,500 54,675 47,250 22,275 27,000 16,875 27,000 90,000 72,900 63,000 29,700 36,000 22,500 36,000 112,500 91,125 78,750 37,125 45,000 28,125 45,000
5001-6000 1526-1830 66,000 53,460 46,200 21,780 26,400 16,500 26,400 88,000 71,280 61,600 29,040 35,200 22,000 35,200 110,000 89,100 77,000 36,300 44,000 27,500 44,000
6001-7000 1831-2135 64,500 52,245 45,150 21,285 25,800 16,125 25,800 86,000 69,660 60,200 28,380 34,400 21,500 34,400 107,500 87,075 75,250 35,475 43,000 26,875 43,000
7001-8000 2136-2440 63,000 51,030 44,100 20,790 25,200 15,750 25,200 84,000 68,040 58,800 27,720 33,600 21,000 33,600 105,000 85,050 73,500 34,650 42,000 26,250 42,000
8001-9000 2441-2745 61,500 49,815 43,050 20,295 24,600 15,375 24,600 82,000 66,420 57,400 27,060 32,800 20,500 32,800 102,500 83,025 71,750 33,825 41,000 25,625 41,000
Feet Meters Size 150 Size 175 Size 200
0-2000 0-610 150,000 121,500 105,000 49,500 60,000 37,500 60,000 175,000 141,750 122,500 57,750 70,000 43,750 70,000 200,000 162,000 140,000 66,000 80,000 50,000 80,000
2001-3000 611-915 141,000 114,210 98,700 46,530 56,400 35,250 56,400 164,500 133,245 115,150 54,285 65,800 41,125 65,800 188,000 152,280 131,600 62,040 75,200 47,000 75,200
3001-4000 916-1220 138,000 111,780 96,600 45,540 55,200 34,500 55,200 161,000 130,410 112,700 53,130 64,400 40,250 64,400 184,000 149,040 128,800 60,720 73,600 46,000 73,600
4001-5000 1221-1525 135,000 109,350 94,500 44,550 54,000 33,750 54,000 157,500 127,575 110,250 51,975 63,000 39,375 63,000 180,000 145,800 126,000 59,400 72,000 45,000 72,000
5001-6000 1526-1830 132,000 106,920 92,400 43,560 52,800 33,000 52,800 154,000 124,740 107,800 50,820 61,600 38,500 61,600 176,000 142,560 123,200 58,080 70,400 44,000 70,400
6001-7000 1831-2135 129,000 104,490 90,300 42,570 51,600 32,250 51,600 150,500 121,905 105,350 49,665 60,200 37,625 60,200 172,000 139,320 120,400 56,760 68,800 43,000 68,800
7001-8000 2136-2440 126,000 102,060 88,200 41,580 50,400 31,500 50,400 147,000 119,070 102,900 48,510 58,800 36,750 58,800 168,000 136,080 117,600 55,440 67,200 42,000 67,200
8001-9000 2441-2745 123,000 99,630 86,100 40,590 49,200 30,750 49,200 143,500 116,235 100,450 47,355 57,400 35,875 57,400 164,000 132,840 114,800 54,120 65,600 41,000 65,600