Carrier PrimeLINE - 3.4 Safety and Protective Devices; Electronic Expansion Valve (EEV); Table 3-3 Safety and Protective Devices

3–13 T-362
3.4 Safety and Protective Devices
Unit components are protected from damage by safety and protective devices listed in Table 3–3. These devices
monitor the unit operating conditions and open a set of electrical contacts when an unsafe condition occurs.
Open safety switch contacts on either or both of devices IP-CP or HPS will shut down the compressor.
Open safety switch contacts on device IP-CM will shut down the condenser fan motor.
The entire refrigeration unit will shut down if one of the following safety devices open: (a) circuit breaker(s); (b) fuse
(F3A/F3B, 7.5A); or (c) evaporator fan motor internal protector(s) - (IP).
Electronic Expansion
Valve (EEV) Nominal
Resistance
Coil Feed to Ground
(Gray Wire)
47 ohms
Coil Feed to Coil Feed 95 ohms
Humidity Sensor (HS)
Orange wire Power
Red wire Output
Brown wire Ground
Input voltage 5 VDC
Output voltage 0 to 3.3 VDC
Output voltage readings verses relative humidity (RH) percentage:
30% 0.99 V
50% 1.65 V
70% 2.31 V
90% 2.97 V
Controller Setpoint Range -35 to +30°C (-31 to +86°F)
Table 3–3 Safety and Protective Devices
Unsafe Condition Device Device Setting
Excessive current draw
Circuit Breaker (CB-1, 25 amp) - Manual Reset Trips at 29 amps (460 VAC)
Circuit Breaker (CB-2, 50 amp) - Manual Reset Trips at 62.5 amps (230 VAC)
Circuit Breaker (CB-2, 70 amp) - Manual Reset Trips at 87.5 amps (230 VAC)
Excessive current draw in the
control circuit
Fuse (F3A & F3B) 7.5 amp rating
Excessive current draw by the
controller
Fuse (F1 & F2) 5 amp rating
Excessive current draw by the
Emergency Bypass module
Fuse (FEB) 10 amp rating
Excessive condenser fan motor
winding temperature
Internal Protector (IP-CM) - Automatic Reset N/A
Excessive compressor motor
winding temperature
Internal Protector (IP-CP) - Automatic Reset N/A
Excessive evaporator fan
motor(s) winding temperature
Internal Protector(s) (IP-EM) - Automatic Reset N/A
Abnormal pressures /
temperatures in the high
refrigerant side
Fusible Plug - Used on the Receiver
Rupture Disc - Used on the Water-Cooled
Condenser
99°C = (210°F)
35 kg/cm
2
= (500 psig)
Abnormally high discharge
pressure
High Pressure Switch (HPS)
Opens at 25 kg/cm
2
(350 psig)
Table 3–2 Electrical Data (Continued)