Specifications

GUIDE SPECIFICATIONS — 538S CONDENSING UNITS (cont)

2. Safeties:

a. High condensing temperature protection (when

matched with 619E fan coils).

b. System diagnostics (when used with 619E fan

coils).

c. Compressor motor current and temperature over-

load protection.

d. High pressure relief.

e. Condenser fan failure protection.

H. Electrical Requirements:

1. Unit shall operate on single-phase, 60 cycle power at

208/230 v as speciﬁed on contract drawings.

2. Unit electrical power shall be a single point

connection.

3. Unit control voltage to the indoor fan coil shall be 24 v.

4. All power and control wiring shall be installed per NEC

and all local building codes.

5. Unit shall have low-voltage terminal block connections.

I. Special Features (Field Installed):

Certain features are not applicable when the features

designated by * are speciﬁed. For assistance in amending

the speciﬁcations, contact your local representative.

* 1. Winter Start Control:

Field-installed winter start control shall permit start-up

for cooling operation under low-load conditions and at

low-ambient temperatures by bypassing the low-

pressure switch for a 3-minute delay period.

NOTE: Winter start control shall be required when unit

is intended to operate in cooling at outdoor ambient

temperature below 40 F.

2. Crankcase Heater:

Field-installed crankcase heater shall be a clamp-on

compressor oil sump heater. Heater shall be used in

all applications where operation in cooling below 40 F

outdoor ambient temperature is anticipated.