06d,07d, Installation – Carrier 07D User Manual
Page 21
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INSTALLATION
06D,07D
Table 4 - Recyling Control Circuit Normal Operation Chart
Control
Voltage
Unit at Rest
Ready to Start
Thermostat Closes
Instantaneous thru
15 Seconds
Normal
Run
Thermostat or
Safety Device
Opens —Instant
Thru 4-3/4 Min
Unit Ready
to Restart
Timer Relay
Coil
230
DE
EN
EN
DE
DE
Contacts N.O.
230
OP
CL
CL
OP
OP
Contacts N.C.
230
CL
OP
OP
CL
CL
Cycle Timer
Motor
230
DE
EN
DE
EN
DE
Cam
Up
Up
Do wn
Down
Up
Contacts A—A2
230
CL
CL
OP
OP
CL
Contacts A—A]
230
OP
OP
CL
CL
OP
Contacts B—B2
230
CL
CL
OP
OP
CL
Contacts B —B|
230
OP
OP
CL
CL
OP
Compressor
Line
DE
DE
EN
DE
DE
Accessories
230
DE
EN
EN
DE*
DE
Legend: EN - Energized
CL
CL — Contacts Closed
OP
DE — De-energized
*Accessories will continue to run if high or low pressurestat shuts off compressor.
Contacts Closed and in Service
Contacts Open
1. starting Sequence (Assuming evaporator in
terlocks and all operating safety controls
are in closed position)
Time: 0 Min 0 Sec - Timer switch plunger
is up at beginning edge of cam node
and contacts are in positions A-A2
and B-B2, as shown.*
Control thermostat closes, energizing liq
uid line solenoid valve (SV) and pump-out
relay (FOR), FOR N.O. contacts close. Re-
frigerant pressure rises and low-pressure
switch closes.
Condenser auxiliaries, such as condenser
water pump, tower fan, etc., start and their
auxiliary starter contacts close. Timer re
lay (TR) is energized thru timer switch con
tacts A-A2, closing TR N.O. contacts and
opening TR N.C. contacts. Timer motor (TM)
is energized thru timer switch contacts B-B2
and starts running.
* This is the position always reached by the cam each time after the compressor has stopped
and the timer motor has completed its 4 min and 45 sec timing run.
Starting Sequence of Time Guard Control (Single Pump-Out Arrangement Shown)
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