ERV/PRV-30/36 - Dacor Service Portal

ERV/PRV-30/36 - Dacor Service Portal
ERV/PRV
Slim line Downdraft
Service and Troubleshooting Guide
For unit with Revision Level “F” & before (ERV/PRV-30/36)
For units with Revision Level “G” & before (ERV/PRV-48)
ERV/PRV COMPONENT DESCRIPTION
CURRENT FLOW
THE SNORKEL SWITCH
The snorkel switch is a single-pole, double throw switch. When the switch button is depressed, the
internal contact close from NC to NO. The tabs on the switch are marked COM/NO/NC. A black wire
runs from L1 on the COM tab, a red wire from the UP & DOWN SWITCH NC tab to the COM side of
the upper limit and jumps over to lower limit switch the red wire jumps down to the blower relay.
CURRENT FLOW
• 120 volts flows from L1 to the COM tab of the switch.
• When the snorkel is in the down position and the up & down switch is depressed, the red
wire sends 120 volts to the UPPER LIMIT SWITCH jumps to LOWER LIMIT SWITCH the drive
motor assembly and the snorkel raises and closes the upper limit switch turns off the drive
motor.
• When the snorkel is in the up position and the switch is depressed, the BLUE wire sends 120
to the fan relay to close and send power to the speed controller out to the remote pot switch
out to the L2 connection power out to the blower motor
SERVICE TIPS
NO 120 VAC TO SNORKEL SWITCH:
• Check incoming voltage at terminal block for 120 VAC
• Check black wire from terminal block to COM tab for 120 VAC
TO CONFIRM A BAD SNORKEL SWITCH:
• Remove the black wire from the snorkel switch.
• Jump across the black and blue wires to raise the snorkel.
• Jump across the black and red wires to lower the snorkel.
continued…
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 1
SNORKEL GOES UP THEN BACK DOWN:
• Check snorkel switch for continuity and miss-wiring.
NOTE: Removing the red, blue, and black wires from the snorkel switch will cause the blower to
come on.
DRIVE MOTOR
The drive motor assembly has an upper limit and a lower limit switch mounted on the drive motor
housing. As the motor rotates, a cam on the motor activates these switches to control the up and
down movement of the vent.
• Check snorkel switch for continuity and miss-wiring.
NOTE: Removing the red, blue, and black wires from the snorkel switch will cause the blower to
come on.
DRIVE MOTOR
The drive motor assembly has an upper limit and a lower limit switch mounted on the drive motor
housing. As the motor rotates, a cam on the motor activates these switches to control the up and
down movement of the vent.
• Check snorkel switch for continuity and miss-wiring.
NOTE: Removing the red, blue, and black wires from the snorkel switch will cause the blower to
come on.
DRIVE MOTOR
The drive motor assembly has an upper limit and a lower limit switch mounted on the drive motor
housing. As the motor rotates, a cam on the motor activates these switches to control the up and
down movement of the vent.
CURRENT FLOW
TO RAISE THE SORKEL:
• Blue wire from snorkel switch sends 120 VAC through upper limit switch to activate the drive
motor.
continued…
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 2
CURRENT FLOW
T0 LOWER THE SNORKEL:
• Red wire from snorkel switch sends 120 VAC through lower limit switch to activate the drive
motor.
SERVICE TIPS
TO TEST THE DRIVE MOTOR WITHOUT REMOVING:
• Remove the two black wires from COM tabs on upper and lower limit
switches.
• Touch one of the black COM leads to L1 on the terminal block, this completes the circuit and
the drive motor should run.
LIMIT SWITCHES
Lower
Limit switch is a single pole, double throw switch with tabs marked COM, NO, and NC. There is a
black wire on the COM. tab that jumps to the upper limit switch. The double blue wire on the NO tab
from the snorkel switch jumps to the upper limit switch. The red wire on the NC tab jumps to the
upper limit switch.
Upper
Limit switch is a single pole, double throw switch with tabs marked COM, NO, and NC. The double
black wire on the COM tab jumps to the lower limit switch and to the snorkel motor. The double red
wire on the NO tab from the snorkel switch jumps to the lower limit switch. The blue wire on the NC
tab jumps to the lower limit switch.
POTENTIOMETER
The remote pot controls the speed of the blower. The higher the resistance, the lower the blower
speed. (The lower the resistance, higher the blower speeds.) The pot has a black and an orange
wire; and both of these wires connect to the speed control.
CURRENT FLOW
• At high setting (1 OHM), the pot receives 120 VAC from the speed control at the orange wire.
• The black wire outputs 120 VAC to L2 (blower)
• At low setting (53 OHMS), the pot receives 120 VAC From the speed control at the orange
wire.
• The black wire outputs 87 VAC to L2 (blower) on low setting (53 OHMS).
continued…
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 3
FLOW
TO LOWER SNORKEL:
• Red wire from snorkel switch sends 120 VAC through lower limit switch to activate the drive
motor.
SERVICE TIPS
TO TEST THE DRIVE MOTOR WITHOUT REMOVING:
• Remove the two black wires from COM tabs on upper and lower limit
switches.
• Touch one of the black COM leads to L1 on the terminal block, this completes the circuit and
the drive motor should run.
LIMIT SWITCHES
Lower
Limit switch is a single pole, double throw switch with tabs marked COM, NO, and NC. There is a
black wire on the COM. tab that jumps to the upper limit switch. The double blue wire on the NO tab
from the snorkel switch jumps to the upper limit switch. The red wire on the NC tab jumps to the
upper limit switch.
Upper
Limit switch is a single pole, double throw switch with tabs marked COM, NO, and NC. The double
black wire on the COM tab jumps to the lower limit switch and to the snorkel motor. The double red
wire on the NO tab from the snorkel switch jumps to the lower limit switch. The blue wire on the NC
tab jumps to the lower limit switch.
POTENTIOMETER:
The remote pot controls the speed of the blower. The higher the resistance, the lower the blower
speed. (The lower the resistance, higher the blower speeds.) The pot has a black and an orange
wire; and both of these wires connect to the speed control.
CURRENT FLOW
• At high setting (1 OHM), the pot receives 120 VAC from the speed control at the orange wire.
• The black wire outputs 120 VAC to L2 (blower)
• At low setting (53 OHMS), the pot receives 120 VAC From the speed control at the orange
wire.
• The black wire outputs 87 VAC to L2 (blower) on low setting (53 OHMS).
continued…
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 4
RELAY:
The relay is a coil activated single pole double throw NC relay (when unit is powered up, the NC
Relay opens). The relay has tabs marked N, L, COM, and NC. There is a white wire on the on tab
coming from the neutral bar. There is a red wire coming from the snorkel switch on the N tab. There
is a black wire on the COM tab from L1 on the terminal block. There is a red wire on the NC tab from
the speed control.
CURRENT FLOW
• When the snorkel switch is depressed, the red wire sends 120 VAC to activate the relay coil
and close the relay contacts.
• The relay contacts close and send 120 VAC to the speed control switch.
• The speed control switch sends 120 VAC to the pot; which sends voltage (120 to 87 VAC) to
control the speed of the blower.
SPEED CONTROL:
The speed control controls the speed of the blower when the pot is set for high (1 OHM) or low (53
OHMS) speed.
CURRENT FLOW
• When the relay contacts close, the red wire sends 120 VAC to the speed control.
• When the pot is set to high (1 OHM), the speed control switch allows 120 VAC to flow to L2
and run the blower at high speed.
• When the pot is set to low (53 OHMS), the speed control switch allows only 87 VAC to flow
to L2 and run the blower at low speed.
SERVICE TIPS
Place a volt meter across L2 and N2 at the terminal block and observe the following voltage readings:
• Pot set to high, 120 VAC - blower runs on high speed.
• Pot set to low, 87 VAC - blower runs on low speed.
• No blower or open blower motor, 120 VAC constant - no blower operation.
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 5
ERV COMPONENT DISASSEMBLY
SNORKEL SWITCH
• The snorkel switch mounts on the top cap. To remove the switch, pry it off of the top cap.
TOP CAP
• Raise Vent to the up position. • Remove screws at either end, lift top off.
Upper Position
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 6
If you have any questions or concerns with this Technical Tip. Please call: 800-353-2267
or email Service@dacor.com
SM1004- Rev A Page 7
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising