Carrier 14SEERYAC-01SUP 14 SEER Single-Packaged Air Conditioner and Gas Furnace System Instruction Manual
- June 6, 2024
- Carrier
Table of Contents
14 SEER
Single-Packaged Air Conditioner and Gas Furnace System
Tower Port Gas Valve Units (Not for use with pro pane)
Supplemental Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: This Instruction is for a temporary Gas Valve Substitution.
NOTE: This unit is for Natural Gas only. If planning to convert to
LP/Propane, please contact the distributor for a replacement gas valve. The
gas valve on this unit will not work with the propane conversion kit.
Please use the following instructions for checking inlet gas pressure,
checking manifold pressure, and adjusting manifold pressure.
Check Inlet Gas Pressure
The inlet gas pressure must be checked with the furnace operating in gas heat mode. This is necessary to make sure the inlet gas supply pressure does not fall below the minimum pressure specified on the rating plate.
- Make sure the gas supply is turned off to the furnace and at the electric switch on the gas valve.
- Loosen the set screw on the inlet tower pressure tap no more than one full turn with a 3/32-in. hex wrench. (See Fig. 2.)
- Connect a manometer to the inlet pressure tap on the gas valve using a 5/16” hose. (See Fig. 2.)
- Turn on the furnace power supply.
- Turn gas supply manual shutoff valve to ON position.
- Turn furnace gas valve switch to ON position.
- Jumper R and W thermostat connections at the furnace control board.
- When main burners ignite, confirm inlet gas pressure is within the range specified on the rating plate.
- Remove jumper across thermostat connections to terminate the call for heat. Wait until the blower-off delay is completed.
- Turn furnace gas valve electric switch to OFF position.
- Turn gas supply manual shutoff valve to OFF position.
- Turn off the furnace power supply.
- Remove manometer and hose from the inlet pressure tap of the gas
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury, death, and/or
property damage.
Inlet pressure tap set screw must be tightened and 1/8–in. NPT pipe plug must
be installed to prevent gas leaks.
14. Tighten set screw on inlet tower pressure tap with 3/32-in. hex wrench.
(See Fig. 2.)
Adjust Gas Input
The gas input to the unit is determined by measuring the gas flow at the meter
or by measuring the manifold pressure. Measuring the gas flow at the meter is
recommended for natural gas units.
Measure Gas Flow (Natural Gas Units)
Minor adjustments to the gas flow can be made by changing the manifold
pressure. The manifold pressure must be maintained between 3.2 and 3.8 IN.
W.C.
If larger adjustments are required, change main burner orifices following the
recommendations of national and local codes.
NOTE: All other appliances that use the same meter must be turned off
when gas flow is measured at the meter. Proceed as follows:
-
Turn off the gas supply to the unit.
-
There are 2 places to measure manifold and either may be used: a. Remove pipe plug on manifold (See Fig. 1). Screw in a 1/8” NPT brass hose barb and connect manometer by sliding connecting hose over the barb.
b. Loosen set screw on manifold tower pressure tap no more than one full turn with a 3/32-in. hex wrench. (See Fig. 2.) Connect manometer by sliding 5/6” connecting hose over the manifold tower pressure tap.
-
Turn on the gas supply to the unit.
-
Record number of seconds for gas meter test dial to make one revolution.
-
Divide the number of seconds in Step 3 into 3600 (number of seconds in one hr).
14 SEER: Supplemental Instructions
6. Multiply the result of Step 4 by the number of cubic feet (cu ft) shown
for one revolution of test dial to obtain cubic feet (cu ft) of gas flow per
hour.
7. Multiply the result of Step 5 by the Btu heating value of the gas to
obtain the total measured input in Btuh. Compare this value with the heating
input shown in Table 1 (Consult the local gas supplier if the heating value of
gas is not known).
EXAMPLE: Assume that the size of the test dial is 1 cu ft, one revolution
takes 32 sec, and the heating value of the gas is 1050 Btu/ft 3 . Proceed as
follows:
- 32 sec. to complete one revolution.
- 3600 ¸ 32 = 112.5.
- 112.5 x 1 =112.5 ft 3 of gas flow/hr.
- 12.5 x 1050 = 118,125 Btuh input.
If the desired gas input is 115,000 Btuh, only a minor change in the manifold pressure is required.
Observe manifold pressure and proceed as follows to adjust gas input:
- Remove regulator cover screw over plastic adjustment screw on gas valve (see Fig. 2).
- Turn the plastic adjustment screw clockwise to increase gas input, or turn the plastic adjustment screw counterclockwise to decrease input (see Fig. 2). Manifold pressure must be between 3.2 and 3.8 IN. WC.
- Replace regulator cover screw on gas valve (see Fig. 2).
- Turn off the gas supply to the unit.
- Remove manometer from pressure tap:
- If using a hosed barb on the manifold pipe, remove the hosed barb and replace it with a pipe plug on the manifold (see Fig. 1).
- If using the tower pressure port, remove the connecting hose. Tighten the set screw on manifold pressure tap using a 3/32” hex wrench. (See Fig. 2.)
- Turn on gas to the unit and check for leaks.
Table 1 – Heating Inputs
HEATING INPUT (BTUH)| NUMBER OF ORIFICES| GAS SUPPLY
PRESSURE (IN. W.C.)| MANIFOLD PRESSURE (IN. W.C.)
---|---|---|---
Natural | Propane †
Min| Max| Min| Max| Natural{| Propane*†
40,000| 2| 4.0| 13.0| 11.0| 13.0| 3.2~3.8| 10.0~11.0
60,000| 3| 4.0| 13.0| 11.0| 13.0| 3.2~3.8| 10.0~11.0
90,000| 3| 4.5| 13.0| 11.0| 13.0| 3.2~3.8| 10.0~11.0
115,000| 3| 4.5| 13.0| 11.0| 13.0| 3.2~3.8| 10.0~11.0
130,000| 3| 4.5| 13.0| 11.0| 13.0| 3.2~3.8| 10.0~11.0
*. Based on altitudes from sea level to 2000 ft (610 m) above sea level. In the U.S.A. for altitudes above 2000 ft (610 m), reduce input rating 4 percent for each additional 1000 ft (305 m) above sea level. In Canada, from 2000 ft (610 m) above sea level to 4500 ft (1372 m) above sea level, derates the unit 10 percent.
†. When a unit is converted to propane, different size orifices must be used.
See separate, natural-to-propane conversion kit instructions.
© 2021 Carrier. All rights reserved.
Edition Date: 03/21
Catalog No: 14SEERYAC-01SUP
Catalog No: 14SEERYAC-01SUP
A Carrier Company
Replaces: New
The manufacturer reserves the right to change, at any time, specifications and
designs without notice and without obligations.
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