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MOST FREQUENT PTAC SERVICE QUESTIONS
1. Can remote thermostats be used on standard (AA)
models?
No, only for use on remote control (RC) models.
2. Which remote thermostats are acceptable for use on
52S products?
HH01AD045 — Manual changeover thermostat
TSTATCCPAC01 — Programmable AC thermostat
TSTATCCPHP01 — Programmable HP thermostat
3. How many 52S series units can be controlled by one
remote thermostat?
Only 2.
4. What is the vent capacity of the 52S products? 35 cfm (standalone). Capacity can be increased
with the use of an external exhaust fan.
5. How do the 52S series models handle condensate
removal?
By using a slinger ring to evaporate the water on
the outdoor coil, and by using an optional acces-
sory drain kit.
6. At what temperature will the outdoor (defrost)
thermostat switch the unit (heat pumps only) into
defrost (emergency heat) mode?
15 F coil temperature/approx 35 F ambient
(approx 40 to 45 F ambient for 1999 models).
7. Can the PTAC unit be configured to allow continuous
fan operation?
Yes. A switch located on the side of the control
box is used to toggle between continuous or cycle
fan mode.
8. Can the discharge air grille be changed to alter the
direction of the airflow?
Yes. Remove the 2 screws and flip the grille over
180 degrees.
9. How does the Emergency Management (EM) accessory
kit work?
In series with the 24-volt control circuit (trans-
former is field-supplied) it disconnects the power
at the front desk during unoccupied periods. The
unit will be energized in emergency heat mode,
provided the push button switch is selected for
heating, if the room temperature drops below
55° F to prevent freezing.
10. When must the accessory subbase be used? When the wall sleeve is more than 4 in. inside
the room. The subbase can be adjusted to a maxi-
mum height of 5
1
⁄
2
inches.
11. How does the PTAC unit prevent condensate water
from freezing in the basepan?
A temperature-activated drain opens when the
temperature drops below 45 F, draining the
water into the sleeve to prevent freezing.
12. What does the outdoor thermostat switch do? The toggle switch, located on the side of the con-
trol box, prevents the compressor from energizing
in heating mode during subfreezing conditions to
ensure adequate heating capacity. The switch
must be returned to the ‘‘heat pump’’ position for
compressor operation during cooling modes.
52S
SERIES
Copyright 1999 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 9a 11a
PC 132 Catalog No. 535-227 Printed in U.S.A. Form 52S-2T Pg 56 4-99 Replaces: 52S-1T