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22
Fig. 19 — Typical Hot Water Coil Piping
Fig. 20 — Typical Heating Coil Control Wiring (ON/OFF)
S
UPPLY
RI
S
ER
RETURN
RI
S
ER
GATE VALVE
CAP FOR BLOWOUT
CONTROL VALVE
(
3
-WAY
S
HOWN)
RETURN
S
UPPL
Y
GATE VALVE
GAGE COCK
FLANGE
S
OR
UNION
LEGEND
C
—
Compressor Contactor
CH
—
Crankcase Heater
COMP
—
Compressor
CLO
—
Compressor Lockout
DISC
—
Disconnect
FRZ
—
Freeze Protection
GND
—
Ground
HPS
—
High-Pressure Switch
HR
—
Heater Relay
IFC
—
Indoor-Fan Contactor
IFM
—
Indoor-Fan Motor
IFR
—
Indoor-Fan Relay
LLT
—
Low Limit Thermostat
LPS
—
Low-Pressure Switch
OFC
—
Outdoor-Fan Contactor
OFM
—
Outdoor-Fan Motor
OFR
—
Outdoor-Fan Relay
SAT
—
Supply Air Thermistor
TB
—
Terminal Block
TRAN —
Transformer
Terminal Block Connection
Marked Terminal
Unmarked Terminal
Factory Wiring
Field Wiring