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INSTALLATION OF HEAT RECOVERY THERMOSTAT
HRTA, 3UG63 and 2YU90
NOTE: This accessory cannot be installed on heaters equipped
with built-in single-pole or two-stage thermostats, because they
use the same mounting location (see item 5 below).
(For heaters with 24 Volt Control Circuit refer to Fig. 7 and proceed
to step 1. For heaters with Line Voltage Control refer to Fig. 6 and
proceed to step 3.)
1. Mount relay in baffle compartment with two No. 8 mounting screws
as shown in Figure 4.
2. Connect the lead wires from the relay to the control terminal board
as shown in Figure 7. Each lead wire is marked for proper terminal
location; connect lead wires as indicated.
3. Remove 5/16" (7.9mm) knockout from back of heater and route
capillary tube through hole (See Figure 1).
4. Install thermostat bulb clip in slot provided in the back panel of the
heater. Secure capillary bulb in clip.
5. Press on left side of logo label on the front of heater to locate shaft
and screw holes. Punch holes through label.
6. Install heat recovery thermostat as shown in Figure 2, coiling any
excess capillary tubing inside the heater.
7. Use the wire tie to hold the thermostat leads to other wiring at
approximately the midpoint of the leads between control terminal
board and thermostat.
WARNING
TO PREVENT A POSSIBLE ELECTRICAL SHORT CIRCUIT OR
FIRE, KEEP CAPILLARY TUBING AWAY FROM INTERNAL
ELECTRICAL COMPONENTS.
8. Refer to wiring diagram, Figure 6 or Figure 7 for wiring procedure.
9. Install knob by pushing onto the thermostat shaft.
10. Set thermostat for desired turn-on temperature. Full counter-clock-
wise rotation of the knob is approximately 70°F (21° C). Full
clockwise rotation of the knob is approximately 120°F (49° C).
INSTALLATION OF 24 AMP AND 60 AMP
POWER DISCONNECT SWITCH
DS25 - 25A MAX LOAD 20A
DS25, DS60, 3UG68, 3UG69, 2YU93 and 2YU94
DS60 - 60A MAX LOAD 50A
1. Use copper conductor supply wire only when using these switches.
2. Remove the 5/8" (16mm) knockout and the two knockout slots from
back of heater, below OFF-ON markings.
3. Install power disconnect switch with two mounting screws as shown
in Figure 5.
4. Install the knob with the pointer position at the "OFF" position mark-
ing when the switch is rotated to the full counterclockwise position.
5. Before connecting the wires of the switch, check the pointer index.
Check to be sure the pointer end of the knob points to "OFF" when
the switch is rotated full counterclockwise. It may be necessary to
rotate the switch 180° to index the pointer knob.
6. Refer to wiring diagram, Figure 8, for wiring procedure.
(NOTE: For single-phase, remove and discard leads "L2" and "S2").
Figure 5. Installation of Power Disconnect Switch
2-STAGE
INTERNAL
THERMOSTAT
BLACK
RED
TO H1
BLK
T
RED
BLK
RED
TO P1
MT-1
MT-2
IMPORTANT! FOR 2 STAGE THERMOSTATS, USE:
1. H1 AND P1 FOR STAGE 1 CONNECTIONS
2. H2 AND P2 FOR STAGE 2 CONNECTIONS
NOTES:
1. THIS STYLE CONTROL TERMINAL BOARD USED WITH MODELS 3KW AND 5KW UNITS (208V,
240V AND 277V ONLY).
2. WHEN UNIT IS WIRED FOR SINGLE PHASE, JUMPER H1 TO H2. IF SINGLE POLE THERMOSTAT
IS USED WITH SINGLE PHASE UNIT, CONNECT THERMOSTAT LEADS TO P1 AND H1.
3. EXTERNAL LINE VOLTAGE THERMOSTAT SHOULD BE TREATED AS SINGLE STAGE ONLY.
Figure 6. Control Terminal Board
BLACK
TO W1
T
T
MT-1
MT-2
2-STAGE
INTERNAL
BLACK
THERMOSTAT
RED
RED
TO R
HEAT RECOVERY
THERMOSTAT OR
REMOTE PILOT DUTY
T
FAN SWITCH
IMPORTANT! FOR 2 STAGE THERMOSTATS, USE:
1. W1 AND R FOR STAGE 1 CONNECTIONS
2. W2 AND R FOR STAGE 2 CONNECTIONS
NOTES:
1. THIS STYLE CONTROL TERMINAL BOARD USED WITH ALL MODELS EXCEPT 3KW AND 5KW UNITS
(208V, 240V AND 277V ONLY).
2. REMOVE JUMPER W1 TO W2 WHEN 2-STAGE THERMOSTAT IS USED.
3. *ONLY ONE OF THESE ACCESSORIES MAY BE INSTALLED IN A SINGLE HEATER.
4. EXTERNAL LINE VOLTAGE THERMOSTATS SHOULD BE TREATED AS SINGLE STAGE ONLY.
Figure 7. Control Terminal Board for RFS1 and RFS2
(for Heaters with Contactors)
Figure 8. Power Disconnect Switch Wiring Diagram for DS25,
DS60, 3UG68, 3UG69 2YU93 and 2YU94
2
HEAT RECOVERY THERMOSTAT HRTA
REMOTE SUMMER FAN SWITCH RFS1
OR
SUMMER FAN SWITCH FS (MANUAL)
H1
H2
F2
S
P1
P2
F1
(for Heaters without Contactors)
REMOTE SUMMER
RED
S
FAN SWITCH RFS1
BLACK
*FAN RELAY (FOR HEAT RECOVERY
THERMOSTAT HRTA OR REMOTE
PILOT DUTY FAN SWITCH RFS2)
TR
S
*SUMMER
G
W2
F1
FAN SWITCH
C
R
W1
F2
470 Beauty Spot Rd. East
Bennettsville, SC 29512 USA
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