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70
Based on Indoor Entering Air of 70 F and Rated CFM
60
50
40
30
20
10
0
-10
Unit 50SZ three-speed motors are factory wired for low speed
operation. Unit 50SZ 030 is factory wired for medium speed. Unit
50SZ 018 has a two-speed motor wired for low speed.
For 208/230-v Motors:— The motor leads are color-coded (See
Table 4).
Table 4—Color Coding for 208/230–V Motor Leads
BLACK = HIGH SPEED
Blue = Medium Speed
Red = Low Speed
To change the speed of the indoor fan motor (IFM), remove fan
motor speed lead from the Time Delay Relay (TDR) and replace
with the lead for the desired blower motor speed. The motor speed
lead is attached to terminal TDR-3. For low and medium speeds,
black must be connected to the jumper wire. Insulate removed lead
end to avoid contact with chassis parts.
MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This heat pump unit should
be inspected at least once each year by a qualified service person.
To troubleshoot unit, refer to Table 11.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
Balance Point Worksheet
0
10
17
Outdoor Air Temp (Deg F)
Fig. 19—50SZ Balance Point Worksheet
20
30
40
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
The ability to properly perform maintenance on this equip-
ment requires certain expertise, mechanical skills, tools and
equipment. If you do not possess these, do not attempt to
perform any maintenance on this equipment, other than those
procedures recommended in the User's Manual.
FIRE, EXPLOSION, ELECTRICAL SHOCK CUT HAZ-
ARD
Failure to follow these warnings could result in serious injury
or death:
1. Turn off electrical power to the unit and install lockout tag
before performing any maintenance or service on this unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injury can result
from sharp edges.
3. Never place anything combustible either on, or in contact
with, the unit.
14
47
50
60
024
030
036
042
048
060
C00093
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