SERVICING
27
3
5
6
8
10
15
19
20
25
DV25PECB14* 550 650 700 715 875
DV37PECC14*
850 900 1000 1120 1220 1250
DV59PECD14*
990 1110 1200 1240 1520
1520
DV61PECD14*
1030 1150 1250 1320 1650
1690 1715
HEATER(kW)
Model
MINIMUM CFM REQUIRED FOR HEATER KITS
HTR
KW
3.0
KW
4.7
KW
6.0
KW
7.0
KW
9.5
KW
14.2
KW
19.5
KW
21.0
KW
BTUH 10200 16200 20400 23800 32400 48600 66500 71600
ELECTRIC HEATER CAPACITY BTUH
For installations not indicated above the following formula is
to be used:
TR = (kW x 3412) x (Voltage Correction) / (1.08 x CFM)
Where: TR = Temperature Rise
kW = Heater Kit Actual kW
3412 = Btu per kW
VC* = 1.0 (240 Supply Volts)
= 0.92 (230 Supply Volts)
= 0.84 (220 Supply Volts)
= 0.77 (210 Supply Volts)
= 0.75 (208 Supply Volts)
1.08 = Constant
CFM = Measured Airflow
*VC (Voltage Correction)
S-61A CHECKING HEATER LIMIT CONTROL(S)
Each individual heater element is protected with a limit con-
trol device connected in series with each element to prevent
overheating of components in case of low airflow. This limit
control will open its circuit at approximately 150°F to 160°F
and close at approximately 110°F.
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT. MULTIPLE POWER SOURC-
ES MAY BE PRESENT. FAILURE TO DO SO MAY
CAUSE PROPERTY DAMAGE, PERSONAL INJURY
OR DEATH.
1. Remove the wiring from the control terminals.
2. Using an ohmmeter, test for continuity across the nor-
mally closed contacts. No reading indicates the control
is open - replace if necessary.
IF FOUND OPEN - REPLACE - DO NOT WIRE AROUND.
S-61B CHECKING HEATER FUSE LIN
(OPTIONAL ELECTRIC HEATERS)
Each individual heater element is protected with a one time
fuse link which is connected in series with the element. The
fuse link will open at approximately 333°F.
WARNING
DISCONNECT ALL POWER BEFORE SERVICING.
1. Remove heater element assembly so as to expose fuse
link.
2. Using an ohmmeter, test across the fuse link for conti-
nuity - no reading indicates the link is open. Replace as
necessary.
NOTE
: The link is designed to open at approximately 333°F.
DO NOT WIRE AROUND - determine reason for failure.
S-100 REFRIGERATION REPAIR PRACTICE
DANGER
ALWAYS REMOVE THE REFRIGERANT CHARGE IN A PROPER
MANNER BEFORE APPLYING HEAT TO THE SYSTEM.
When repairing the refrigeration system:
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT. MULTIPLE POWER SOURC-
ES MAY BE PRESENT. FAILURE TO DO SO MAY
CAUSE PROPERTY DAMAGE, PERSONAL INJURY
OR DEATH.
1. Never open a system that is under vacuum. Air and
moisture will be drawn in.
2. Plug or cap all openings.
3. Remove all burrs and clean the brazing surfaces of the
tubing with sand cloth or paper. Brazing materials do not
flow well on oxidized or oily surfaces.
4. Clean the inside of all new tubing to remove oils and
pipe chips.
5. When brazing, sweep the tubing with dry nitrogen to
prevent the formation of oxides on the inside surfaces.
6. Complete any repair by replacing the liquid line drier in
the system, evacuate and charge.
BRAZING MATERIALS
IMPORTANT NOTE:
Torch heat required to braze tubes of
various sizes is proportional to the size of the tube. Tubes of
smaller size require less heat to bring the tube to brazing tem-
perature before adding brazing alloy. Applying too much heat
to any tube can melt the tube. Service personnel must use the
appropriate heat level for the size of the tube being brazed.
