Table 12 – Altitude Compensation* (A04-A06) - Low NOx Units

ELEVATION

60,000, 90,000

120,000

 

BTUH Nominal

BTUH Nominal

ft (m)

NG Orifice Size

LP Orifice Size

NG Orifice Size

LP Orifice Size

 

 

0 --- 2000 (610)

382

534

321

503

2000

(610)

392

544

331

514

3000

(914)

†40

544

341

514

4000 (1219)

†41

544

351

514

5000 (1524)

†41

544

351

514

6000 (1829)

†42

544

361

524

7000 (2134)

†42

544

361

524

8000 (2438)

†43

554

372

524

9000 (2743)

†43

554

382

534

10000

(3048)

442

554

†40

534

11000

(3353)

442

554

†41

534

12000

(3658)

452

†56

†42

544

13000

(3962)

473

†56

†43

544

14000

(4267)

483

†56

†43

554

LEGEND

 

1 = CRLPELEV001A00

NG = Natural Gas

LP = Liquid Propane

*

As the height above sea level increases, there is less oxygen

2 = CRLPELEV002A00

 

per cubic ft. of air. Therefore, heat input rate should be reduced

3 = CRLPELEV003A00

 

at higher altitudes.

 

4 = CRLPELEV004A00

{

Not included in kit. May be purchased separately through

 

dealer.

48TC

Minimum heating entering air temperature

When operating on first stage heating, the minimum temperature of air entering the dimpled heat exchanger is

heating is initiated using low entering air temperatures with insufficient heating temperature rise.

Thermostat

LCTB

50_F continuous and 45_F intermittent for standard heat exchangers and 40_F continuous and 35_F intermittent 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 series with the second stage gas valve. See Fig. 39. Set the outdoor-air thermostat at 35 F for stainless steel heat

TH1

TH2

W1

OALT

W2

C08442

Fig. 39 - OATL Connections

_

exchangers or 45_F for standard heat exchangers. This temperature setting will bring on the second stage of heat whenever the ambient temperature is below the thermostat setpoint. Indoor comfort may be compromised when

Troubleshooting Heating System

Refer to Table 13 and Table 14 for additional troubleshooting topics.

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Carrier 48TCA04---A12 appendix Troubleshooting Heating System, Altitude Compensation* A04-A06 Low NOx Units

48TCA04---A12 specifications

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