Qmark MUH User Manual
T
HERMOSTAT
BULB CLIP
5/16" (7.9mm)
DIAMETER
KNOCKOUT
BACK OF HEATER
KNOB
MOUNTING
SCREWS (2)
FRONT OF
HEATER
THERMOSTAT
Electrical Accessories
KNURLED
NUT
O
N
A
U
T
O
FAN
SWITCH
SLOT DOWN
HEX NUT
LOCKWASHER
BACK OF
HEATER
FRONT OF HEATER
CONTROL TERMINAL BOARD
RELAY
NO. 8
MOUNTING SCREWS
For MUH, HUHAA, Dayton 3UF77 - 3UF98 and
2YU58-2YU81, 3END3 and 3END4 Series Unit Heaters
INSTALLATION OF INTERNAL THERMOSTAT
MT1, MT2, 2E569, 3UG72 2YU33 and 2YU95
1. Remove 5/16" (7.9mm) knockout from back of heater and route cap-
illary tube through hole (Figure 1).
2. Install thermostat bulb clip in slot provided in the back panel of the
heater. Secure capillary bulb in clip.
3. Press on left side of logo label on front of heater to locate shaft and
screw holes. Punch holes through label.
4. Install thermostat as shown in Figure 2, coiling any excess capillary
tubing inside the heater.
Figure 1. Installation of Internal Thermostat Capillary
WARNING
TO PREVENT POSSIBLE ELECTRICAL SHORT CIRCUIT OR
FIRE, KEEP CAPILLARY TUBING AWAY FROM INTERNAL
ELECTRICAL COMPONENTS.
5. Refer to wiring diagram, Figure 6, for wiring procedure on 3KW and
5KW (208V, 240V and 277V only). Refer to wiring diagram, Figure
7, for wiring procedure on all other heaters.
6. Remove backing from label (supplied) and install over thermostat
shaft. Install knob by pushing onto the thermostat shaft.
3. Install leads to terminal block. Refer to wiring diagram, Figure 6, for
wiring procedure on 3KW and 5KW units (208V, 240V, and 277V
only). Refer to wiring diagram, Figure 7, for wiring procedure on all
other heaters.
INSTALLATION OF REMOTE FAN SWITCH
RFS1
The Remote Fan Switch is mounted external and remote from the unit
heater. The voltage of the remote fan switch circuit is the same as the
supply voltage to the heater.
1. Use 14 gauge copper, NEC Class 1, 600V rated insulated wire.
Wiring must meet all local and NEC requirements.
2. Install the remote fan switch in a standard wall box in any conve-
nient location that is protected from traffic or other accidental damage.
3. Connect the 14 gauge copper field wire to the switch lead wires with
suitable connectors.
4. A 1/2-inch (12.7mm) knockout is provided in the back of the heater
adjacent to the control terminal board. Use a crimp-on terminal suitable for No. 8 screw on the control terminal board. Connect one field
wire terminated lead to terminal F1 and the other terminated lead to
terminal F2. Refer to Figure 6 for connecting to heaters without builtin contactors. Refer to Figure 7 for connecting to heaters equipped
with built-in contactors.
INSTALLATION OF REMOTE PILOT DUTY FAN
SWITCH RFS2 (Including Wall Switch and Relay)
The Remote Fan Switch is mounted external and remote from the unit
heater.
1. Use 18 gauge (min.), NEC Class 1, 600V wiring that meets all local
and NEC requirements.
2. Install the remote fan switch in a standard wall box in any conve-
nient location that is protected from traffic or other accidental damage.
3. Connect the field wire to the switch lead wires with suitable connec-
tors.
4. A 1/2-inch (12.7mm) knockout is provided in the back of the heater
adjacent to the control terminal board. Use a crimp-on terminal
suitable for No. 8 screw on the control terminal board. Connect one
field wire terminated lead to terminal "R" and the other terminated
field wire lead to terminal "G". Refer to Figure 7.
5. Install relay as indicated below.
Figure 2. Installation of Internal Thermostat
INSTALLATION OF FAN SWITCH
FS, 3UG03 and 2YU82
1. Remove 1/2" (12.7mm) knockout (located between ON and AUTO)
from back of heater (Figure 3).
2. Install manual fan switch as shown in Figure 3. (Note orientation of
slot in switch nozzle. Locate slot in the switch nozzle towards the
"AUTO" position.) Be sure to use lockwasher to prevent rotation of
switch.
Figure 3. Installation of Fan Switch
INSTALLATION OF FAN RELAY (For RFS2)
1. Mount relay in control 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 the lead wires as indicated.
Figure 4. Installation of Fan Relay
1
NSTALLATION OF HEAT RECOVERY THERMOSTAT
OF
F
O
N
MOUNTING
SCREWS (2)
POWER
DISCONNECT
SWITCH
KNOB
BACK OF
HEATER
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.
S
F2H2
F1
H1
P2P1
RED
BLK
RED
BLK
M
T-2
MT-1
2
-STAGE
I
NTERNAL
THERMOSTAT
H
EAT RECOVERY THERMOSTAT HRTA
REMOTE SUMMER FAN SWITCH RFS1
S
UMMER FAN SWITCH FS (MANUAL)
T
B
LACK
T
O H1
RED
TO P1
O
R
2E569
2YU33
3UG72
2YU95
3UG03, 2YU82
3
UG63, 2YU90
SEE
NOTE 1
TERMINAL
BLOCK
POWER
DISCONNECT
SWITCH
S1
S2
S3
L1
L2
L3
TO
POWER
SUPPLY
SEE
NOTE 2
NOTES:
1. THIS ILLUSTRATION SHOWS WIRING HOOK UP FOR THREE PHASE
SERVICE. REMOVE LEAD WIRES MARKED L2 AND S2 WHEN USING
ONE PHASE POWER SERVICE.
2. USE COPPER SUPPLY WIRE ONLY WITH THIS SWITCH.
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.
REMOTE SUMMER
FAN SWITCH RFS1
S
S
*FAN RELAY (FOR HEAT RECOVERY
THERMOSTAT
HRTA OR REMOTE
PILOT DUTY FAN SWITCH RFS2)
T
R
F1W2G
F2W1RC
*SUMMER
FAN SWITCH
BLACK
RED
BLACK
RED
HEAT RECOVERY
THERMOSTAT OR
REMOTE PILOT DUTY
FAN SWITCH
T
BLACK
TO W1
T
MT-2
2-STAGE
INTERNAL
THERMOSTAT
T
RED
TO R
MT-1
2E569
2YU33
3UG72
2YU95
I
HRTA, 3UG63 and 2YU90
NOTE: This accessory cannot be installed on heaters equipped
with built-in single-pole or two-stage thermostats.
(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.
Figure 6. Control Terminal Board (for Heaters without Contactors)
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 25 AMP AND 60 AMP
POWER DISCONNECT SWITCH
DS25, DS60, 3UG68, 3UG69, 2YU93 and 2YU94
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 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
Figure 5. Installation of Power Disconnect Switch
6/09 ECR 38318
5200-2298-502
470 Beauty Spot Rd. East
2
Bennettsville, SC 29512 USA
Loading...