31
Table12 – Altitude Compensation* (A04--A06) -- Low NOxUnits
ELEVATION
ft (m)
60,000, 90,000
BTUH Nominal
120,000
BTUH Nominal
NG Orifice Size LP Orifice Size NGOrifice Siz e LPOrifice Siz e
0 ---2000 (610) 382534321503
2000(610) 392544331514
3000(914) †40 544341514
4000(1219) †41 544351514
5000(1524) †41 544351514
6000(1829) †42 544361524
7000(2134) †42 544361524
8000(2438) †43 554372524
9000(2743) †43 554382534
10000(3048) 442554†40 534
11000(3353) 442554†41 534
12000(3658) 452†56 †42 544
13000(3962) 473†56 †43 544
14000(4267) 483†56 †43 554
LEGEND
NG= Natural Gas LP= Liquid Propane
* Asthe height above sea level increases, there isless oxygen
percubic ft. of air. Therefore,heat input rate should be reduced
athigher altitudes.
{Notincluded in kit. May be purchasedseparately through
dealer.
1= CRLP ELEV001A00
2= CRLP ELEV002A00
3= CRLP ELEV003A00
4= CRLP ELEV004A00
Minimumheating entering air temperature
When operating on first stage heating, the minimum
temperature of air entering the dimpled heat exchangeris
50_F continuous and 45_F intermittent for standard heat
exchangersand 40_F continuous and 35_Fintermittent for
stainless steel heat exchangers. To operate at lower
mixed--air temperatures, a field--supplied outdoor--air
thermostat must be used to initiate both stages of heat
when the temperature is below the minimum required
temperature to ensure full fire operation. Wire the
outdoor--air thermostat OALT(part no. HH22AG106) in
serieswith the second stage gas valve. See Fig. 39. Set the
outdoor--air thermostat at 35_F for stainless steel heat
exchangers or 45_F for standard heat exchangers. This
temperature setting will bringon the second stage of heat
wheneverthe ambient temperature is below the thermostat
setpoint. Indoor comfort may be compromised when
heating is initiated using low entering air temperatures
with insufficientheating temperature rise.
LCTB
W2
Thermostat
TH1
TH2
W1
W1
W2
OALT
C08442
Fig. 39 --OATL Connections
TroubleshootingHeating System
Refer to Table 13 and Table 14 for additional
troubleshooting topics.
48TC