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*Optional Wiring.
AL — Alarm Relay Contacts
ASTAT — Aquastat
BM — Blower Motor
BMC — Blower Motor Capacitor
BR — Blower Relay
CB — Circuit Breaker
CC — Compressor Contactor
CO — Sensor, Condensate Overflow
DTS — Discharge Temperature Switch
ECM — Electronically Commutated Motor
FP1 — Sensor, Water Coil Freeze Protection
FP2 — Sensor, Air Coil Freeze Protection
HP — High-Pressure Switch
HPWS — High-Pressure Water Switch
HWG — Hot Water Generator
JW1 — Clippable Field Selection Jumper
LOC — Loss of Charge Pressure Switch
LON — Local Operating Network
MV — Motorized Valve
MVES — Motorized Valve End Switch
NEC — National Electrical Code
P1 — Field Wiring Terminal Block
RVS — Reversing Valve Solenoid
TRANS — Transformer
NOTES:
1. Compressor and blower motor thermally protected internally.
2. All wiring to the unit must comply with NEC and local codes.
3. Transformer is wired to 460 v (BLK/RED) lead for 460/3/60 units. Transformer is energy limiting or may
have circuit breaker.
4. FP1 thermistor provides freeze protection for water. When using antifreeze solutions, cut JW3 jumper.
5. Typical thermostat wiring shown. Refer to thermostat installation instructions for wiring to the unit. Ther-
mostat wiring must be Class 1 and voltage rating equal to or greater than unit supply voltage.
6. Factory cut JW1 jumper. Dry contact will be available between AL1 and AL2.
7. Transformer secondary ground via Complete C board standoffs and screws to control box. (Ground
available from top two standoffs as shown.)
8. Aquastat is supplied with unit and must be wired in series with the hot leg to the pump. Aquastat is rated
for voltages up to 277-v.
9. Optional LON wires. Only connect if LON connection is desired at the wall sensor.
10. Fan motors are factory wired for medium speed. For high or low speed, remove BLU wire from fan motor
speed tap “M” and connect to “H” for high speed or “L” for low speed.
11. For low speed, remove BLK wire from BR “6” and replace with RED. Connect BLK and BRN wires
together.
12. For blower motors with leads. For medium or low speed, disconnect BLK wire from BR “6”. Connect BLK
and ORG/PUR wire together. Connect RED for low or BLU for medium to BR “6”.
13. The 460-v units using an ECM (electronically commutated motor) fan motor, modulating HWR, and/or an
internal secondary pump will require a neutral wire from the supply side in order to feed the accessory
with 265-v.
Complete C
a50-8363
LEGEND
Field Line Voltage Wiring
Field Low Voltage Wiring
Printed Circuit Trace
Optional Wiring
Relay/Contactor Coil
Condensate Pan
Solenoid Coil
Temperature Switch
Thermistor
Ground
Wire Nut
Relay Contacts - N.C.
Relay Contacts - N.O.
Low Pressure Switch
High Pressure Switch
Splice Cap
Circuit Breaker
Fig. 21 — Wiring of 50PTH,PTV,PTD026-072 Units with Complete C and LON Controller, Three Phase (460 V)