Carrier 48KH - Manual (Page 5)

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Fig. 5 — Vent Cap Assembly
Step 2 — Make Gas Piping Connections — The
gas supply pipe enters unit thru access hole provided.
See Fig. 4 for location. The gas connection to unit is
made to the 1/2-in. FPT gas inlet on gas valve. See
Fig. 6 for inlet location.
Install a separate gas supply line that runs directly
from meter to heating section. Do not use cast-iron
pipe. Check local utility for recommendations con­
cerning existing lines. Choose a supply pipe that is
large enough to keep pressure loss as low as practical.
Never use pipe smaller than the 1 / 2-in. FPT gas inlet
on gas valve.
When installing gas supply line, observe local
codes pertaining to gas pipe installations. Refer to
National Fuel Gas Code ANSI Z223.1-1980 or
NFPA 54-1980 in absence of local building codes.
Adhere to following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all
pipe 1 /4 in. in every 15 ft to prevent traps. Grade
all horizontal runs downward to risers. Use risers
to connect to heating section and to meter.
2. Support all piping with appropriate hangers, etc.
Use a minimum of one hanger in every 6 feet. For
pipe sizes larger than 1/2 in., follow recom­
mendations of national codes.
7
8
9
10
Control Transformer 11 — Pilot Tube
Compressor Contactor 12 — Model 646A-X Gas
Ground Lug Valve
Dual Run Capacitor 13 — Pressure Tap Pipe Plug
(for compressor and 14 — Gas Valve Outlet
condenser fan motor) 15 — Gas Manifold
Low-Voltage Pigtail 16 — Gas Burner
Leads 17 — Burner Air Shutter
Compressor/Control 18 — Secondary-Air Shield
Compartment Divider 19 — Blower Flousing
Panel 20 — Evaporator Motor Run
Igniter Module Capacitor
Manual ON/OFF 21 — Blower/Control Com­
Knob partment Divider
Gas Valve Inlet Panel
Pipe Plug — LP 22 — Heating Relay
(Propane) unit pres­
sure switch mounts
here 23 — Cooling Relay
Fig. 6 — Model 48KL036 — Side View
(Partial) with Access Door Removed
3. Apply joint compound (pipe dope) sparingly and
only to male threads of joint when making pipe
connections. Use only pipe dope that is resistant
to action of liquefied petroleum gases as speci­
fied by local and/or national codes.
Never use
pipe thread tape.
4. Install a sediment trap in riser leading to the heat­
ing section. See Fig. 7. This drip leg functions as a
trap for dirt and condensate. Install trap where
condensate cannot freeze. Install this sediment
trap by connecting a piping tee to riser leading to
heating section, so that straight-thru section of
tee is vertical. Then, connect capped nipple into
lower end of tee. Extend capped nipple below
level of gas controls.