Start-Up, Adjustment, And Safety Check - Carrier 912SD Installation, Start-Up, Operating And Service And Maintenance Instructions

912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
Example 2
A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE:
100 feet (30 M) of vent pipe, 95 feet (29 M) of combustion air inlet pipe, (3) 90º long-radius elbows, and a polypropylene concentric vent kit. Also
includes 20 feet (6.1 M) of flexible polypropylene vent pipe, included within the 100 feet (30 M) of vent pipe.
VERIFY FROM POLYPROPYLENE VENT MANUFACTURER'S INSTRUCTIONS for the multiplier correction for flexible vent pipe.
Can this application use 60mm o.d. (2") polypropylene vent piping? If not, what size piping can be used?
Measure the required linear length of RIGID air inlet and vent pipe; insert the longest of
the two here: 100 ft. Of rigid pipe - 20 ft. Of flexible pipe
Add equiv length of (3) 90º long-radius elbows (use the
highest number of elbows for either the vent or inlet pipe)
Add equiv length of 45º long-radius elbows
(use the highest number of elbows for either the vent or
inlet pipe)
Add equiv length of factory concentric vent term
Add correction for flexible vent pipe, if any
* VERIFY FROM VENT MANUFACTURER'S INSTRUCTIONS; For example only, assume 1 meter of flexible 60mm (2") or 80mm (3") polypropylene
pipe equals 2.0 meters (6.5 ft.) of PVC/ABS pipe.
Total Equivalent Vent Length (TEVL)
Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?
Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?
START-UP, ADJUSTMENT, AND SAFETY
CHECK
!
IMPORTANT INSTALLATION AND STRAT-UP
PROCEDURES
Failure to follow this procedure may result in a nuisance smoke or odor
complaint.
The manifold pressure, gas rate by meter clocking, temperature rise and
operation must be checked after installation. Minor smoke and odor
may be present temporarily after start-up from the manufacturing
process. Some occupants are more sensitive to this minor smoke and
odor. It is recommended that doors and windows be open during the
first heat cycle.
General
1. Furnace must have a 115-v power supply properly connected and
grounded.
NOTE: Proper polarity must be maintained for 115-v wiring. Control
status indicator light flashes rapidly and furnace does not operate if
polarity is incorrect or if the furnace is not grounded.
2. Thermostat wire connections at terminals R, W, G, and Y must be
made at 24-v terminal block on furnace control.
3. Natural gas service pressure must not exceed 0.5 psig (14- in. w.c.,
350 Pa), but must be no less than 0.16 psig (4.5-in. w.c., 1125 Pa).
4. Blower door must be in place to complete 115-v electrical circuit
and supply power to the furnace components.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
NOTICE
=
5 ft.
3 x =
(1.5 M)
0 x =
3.3 ft
9 x =
(0.9 M)
20 ft.
2* x =
(6.1 M)
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit operation
or performance dissatisfaction.
These furnaces are equipped with a manual reset limit switch in burner
assembly. This switch opens and shuts off power to the gas valve is an
overheat condition
assembly/enclosure.
improper gas pressure setting, improper burner or gas orifice
positioning or improper venting condition before resetting switch. DO
NOT jumper this switch.
Before operating furnace, check flame rollout manual reset switch for
continuity. If necessary, press button to reset switch.
EAC-1 (115vac) terminal is energized whenever blower operates. HUM
(24vac)terminal is only energized when the gas valve is energized in
heating.
Prime Condensate Trap with Water
CARBON MONOXIDE POISONING HAZARD
Failure to follow these warnings could result in personal injury or
death.
Failure to use a properly configured trap or NOT water-priming trap
before operating furnace may allow positive pressure vent gases to
enter the structure through drain tube. Vent gases contain carbon
monoxide which is tasteless and odorless.
48
80 ft. Use length of the longer of the vent
(24 M) or air inlet piping system
15 ft.
(4.6 M)
0 ft.
Example from polypropylene vent
(0 M)
manufacturer's instructions, Verify from vent
30 ft. manufacturer's instructions.
(9 M)
40 ft.
(12.2 M)
165 ft.
Add all of the above lines
(50 M)
95 ft.
For 2" pipe from Table 13
(29 M)
Therefore, 60mm (2") pipe may NOT be
NO
used; try 80mm (3")
185 ft.
For 3" pipe from Table 13
(57 M)
YES Therefore, 80mm (3") pipe MAY be used
CAUTION
!
(flame rollout) occurs
Correct inadequate combustion-air
WARNING
!
in the burner
supply,