MOAS Installation, Operation & Maintenance Manual

On delivery

Inspect the equipment inside and out for damage, and report any damage to the carrier immediately. Check that every accessory is present and undamaged (section 03).

Who does what

Installing contractor

Mounts the cabinet and container, connects the water, mounts the nozzles and runs the lines, and completes the check-off list (section 12).

Installing electrician

Runs the dedicated circuit, and mounts and wires the exhaust-fan interlock and any remote alarm.

Start-up

Authorized personnel or trained kitchen staff start MOAS up, with a trained HVAC technician present, and fill in the equipment record.

Owner and staff

Check the solution level daily, make the monthly checks and keep the maintenance log. For maintenance or repair, authorized technicians or trained staff open the cabinet door and work on the components directly.

Listing

MOAS is ETL Listed under Intertek Report 101453585DEN-002. The report identifies UL 197 and CSA C22.2 No. 109 as the applicable standards. Listing does not establish approval of a field installation.

Performance: up to 95% odor reduction, up to 50% smoke reduction and up to 6,000 CFM per two-nozzle system. Performance varies with cooking process, hood grease-removal performance, exhaust configuration, installation, dwell time and calibration. Results are not guaranteed. Capacity is subject to project-specific configuration; smoke reduction is not a particle-filtration rating.

MOAS mixes Molitron Odor Neutralizer Solution with your building’s cold water and sends it, with compressed air, to two nozzles that mist it into your exhaust duct. The exhaust carries the mist toward the fan, giving it time to act on cooking odors. Everything that mixes and meters the solution is in one stainless steel cabinet on the wall.

1. 1
   Cold water in

   A 1/4 in copper line brings the building’s cold water in at the top and down the left side to the ball valve, the cabinet’s own shutoff.

2. 2
   Solution drawn in

   When the solenoid valve opens, water passing through the brass injector draws Odor Neutralizer Solution up from the container below, through a clear pickup tube and a check valve.

3. 3
   Mixing container

   Water and solution flow into the clear mixing container. A float switch and the refill delay timer decide when it refills.

4. 4
   Air compressor

   The Gast compressor sends air up the black line to the AIR port of each nozzle. The cooling fan above it carries its heat out of the top of the cabinet.

5. 5
   Metering pump

   The Stenner pump’s rollers squeeze its pump tube to send a measured flow of diluted solution up the red line to the LIQUID port of each nozzle.

6. 6
   Out to the duct

   The red and black lines leave the cabinet top for two nozzles on opposite sides of the exhaust duct, where air and solution combine into a fine mist.

Three separate circuits

Refill

The float switch in the mixing container. When it drops, the refill relay and delay timer open the water solenoid valve after the delay; when the level rises, the float closes it.

Low-solution alarm

A pressure switch senses the container’s level through a separate sensing tube. When the level is low, it sounds the buzzer inside the cabinet and lights the red light on top, with control power available.

Delivery

The metering pump draws from the mixing container and feeds the red line to the nozzles; the compressor feeds the black line.

Front

Side

The stainless steel solution container ships with the cabinet. The remote low-solution alarm is optional.

Location

Any convenient, ventilated indoor spot near your kitchen staff, where they can reach the solution container and hear the alarm. Never an enclosed closet without ventilation. It need not be beside the cooking line.

Mounting

Hang the cabinet on wall studs, 16 in centers, through the two keyhole tabs at the top of its back, with the 1/4 in lag bolts supplied. Mount the solution container on the wall below it. Final support and anchorage are project-specific.

Clearance

Keep the cooling-fan opening on top clear, and leave room to open the door and slide the container lid forward.

Finished spaces

Where the cabinet is above or near a finished space, protect that space from water damage in case of a plumbing leak or equipment failure.

Cold water

A 1/4 in copper cold-water supply to the connection on the cabinet top, 80 PSI maximum, with enough pressure for the injector to draw solution. Fit a building shutoff valve; the ball valve inside the cabinet is MOAS’s own shutoff.

Backflow protection

Molitron provides backflow protection for MOAS’s cold-water connection. Confirm the installation meets your local plumbing code.

Power

A 120 VAC, 20 A circuit dedicated to MOAS, in conduit from the electrical panel through the MOAS exhaust-fan interlock to the cabinet. Everything inside the cabinet is factory wired. See section 05.

Mounting the nozzles

Each nozzle comes attached to a 4 in square stainless steel plate with eight holes. The plate mounts on the outside of the exhaust duct, over a 1-1/2 in hole the contractor drills, and the nozzle sprays into the exhaust stream.

1. 1
   Choose the spot

   Two nozzles go on opposite sides of the exhaust duct, as close to the hood as practical, with at least 10 ft of duct between them and the exhaust discharge so the mist has time to act. Leave each nozzle’s rear cleaning button within reach for the monthly cleaning.

2. 2
   Weld the studs

   Weld the eight stainless steel studs supplied to the outside of the duct wall, to match the eight holes in the 4 in square mounting plate.

3. 3
   Drill the hole

   With the plate in place over the studs, mark the centre of the plate. Remove the plate and drill a 1-1/2 in hole through the duct wall at the mark.

4. 4
   Mount the nozzle

   Fit the plate, with its nozzle, over the studs so the nozzle sprays through the hole into the duct. Secure it with the nuts, washers and lock washers supplied.

5. 5
   Connect the lines

   Push the black 3/8 in air line into the port marked AIR and the red 1/4 in solution line into the port marked LIQUID. The nozzle and plate come off the duct as one piece if they ever need service.

Running the lines

Air

Black 3/8 in OD tubing, from the cabinet top to a 3/8 in tee, then a branch to the AIR port of each nozzle.

Solution

Red 1/4 in OD tubing, from the cabinet top to a 1/4 in tee, then a branch to the LIQUID port of each nozzle.

Length

Up to 100 ft for each routed path from the cabinet, through its tee, to a nozzle. Keep matching branches close in length, comparing the two air branches with each other and the two solution branches with each other. Confirm routing with Molitron.

Conduit

Running both lines in 1 in conduit is recommended to protect them. It is not a universal code requirement.

Container tubes

The clear pickup and pressure-sensing tubes run from the bottom of the cabinet down into the container through its fixed top panel. Keep them in their installed positions.

MOAS needs a 120 VAC, 20 A circuit dedicated to it, run in conduit from the electrical panel through the MOAS exhaust-fan interlock to the power switch on top of the cabinet. The exhaust fan has its own, separate connection to the interlock. Everything inside the cabinet is factory wired. The listed equipment rating, 120 V, 3.5 A, 60 Hz, is a separate value from the dedicated-circuit requirement.

Exhaust-fan interlock

The relay keeps MOAS from running whenever the exhaust fan is off. It is energized by the exhaust fan’s power: when the fan is on, the relay closes and completes the MOAS circuit from the building panel to the cabinet. MOAS does not power the exhaust fan. It measures 4 W × 7 H × 2.5 D in.

Powering the coil

• Preferably, use the 120 V power and common from the hood switch that energizes the exhaust fan’s magnetic motor starter coil (white/black and white/yellow leads).
• For 208–277 V exhaust fans, use one of the phases and the common (white/brown and white/yellow leads).

Remote low-solution alarm (optional)

Size

3 W × 5 H × 3 D in

What it does

Repeats the cabinet’s low-solution alarm where staff can see it. Its faceplate carries a red light, a speaker grille and two contacts marked Touch to silence.

Power

24 V, from the cabinet’s low-solution alarm terminals, where it shares the red light’s power.

Cable

18/2 shielded security cable from the cabinet to the alarm.

Location

Mounted and wired by the installing electrician, somewhere staff can see it while they work, for example near the hood.

Inside the cabinet

Refill sequence. When the float switch is down, the refill relay is not energized, and the water solenoid valve opens once the delay timer has timed out. When the water raises the float, the relay is energized and the solenoid valve closes. The delay is adjustable from 30 seconds to 8 minutes and is set to 8 minutes.

Start-up follows these seven steps, in this order. The parts are pictured in section 10.

1. 1Turn on the water
2. 2Unplug the three cords
3. 3Open the control enclosure
4. 4Power on
5. 5Set the clock
6. 6Set the cooking periods
7. 7Plug the cords back in

Step 1 of 7

Turn on the water

Open the building’s water supply valve, installed by the plumber, then the red-handled ball valve on the left side inside the cabinet.

BackNext step

1. Turn on the water. Open the building’s water supply valve, installed by the plumber, then the red-handled ball valve on the left side inside the cabinet.
2. Unplug the three cords. In the receptacle box inside the cabinet, unplug the cords for the solution pump, the air compressor and the cooling fan.
3. Open the control enclosure. Open the cover of the control enclosure at the upper right and find the IDEC SmartRelay: its display, the arrow buttons, Esc and OK.
4. Power on. With the exhaust fan running so the interlock lets power through, turn the cabinet power switch on top of the cabinet to ON. The display shows the time and date. Press Esc to see the menu: Stop (if it shows Start instead, select Start and press OK), Program, Setup, Network, Diagnostics.
5. Set the clock. Select Setup with the down arrow and press OK. Select Clock and set the time, in 24-hour time, and the date with the arrow buttons. Press OK four times to return to the time and date.
6. Set the cooking periods. Press Esc, then select Program, Set Parameter, Run Periods, and set up to three periods to match your kitchen’s cooking hours (see section 07). If you set them during a period, MOAS starts: after the refill delay, the water solenoid valve opens and fills the mixing container, then shuts off when it is full.
7. Plug the cords back in. Plug in the solution pump, the air compressor and the cooling fan. MOAS is in full operation as soon as solution and air reach the nozzles in the duct.

Then set the pump speed for your kitchen’s exhaust, check that both nozzles are misting, leave the mode switch on Automatic, and fill in the equipment record (section 12). The technician 3D start-up guide walks through the cabinet in the viewer.

Record each month in the maintenance log (section 12).

Replacing the pump tube

Before service

Before any service except the monthly nozzle buttons, turn the cabinet power switch off and close the cabinet water valve. The cabinet carries 120 VAC: always unplug the pump before working on it.

• Do not apply grease, oil or lubricants to the pump tube or housing.
• Before replacing the tube, inspect the whole pump head for cracks or damaged parts, and make sure the rollers turn freely.
• Rinse off solution residue and clean all fluid and debris from the pump head parts.
• Do not pull hard on the pump tube, and avoid kinking or damaging it as you fit it.
• After any tube rupture, inspect the suction and discharge tubing and their fittings for blockages, and clear or replace them as needed.

These ten steps remove the old tube and prepare the pump head. Then fit the new tube, refit the cover and prime the pump as Stenner’s instructions describe under Install New Tube: Stenner ECON FX and VX instructions (PDF). Open the water valve and turn the power back on when you are done.

1. 1Unplug the pump
2. 2Unlock the cover
3. 3Slide the cover off
4. 4Remove the tube
5. 5Remove the rollers
6. 6Clean
7. 7Check the cover
8. 8Check the rollers
9. 9Replace worn rollers
10. 10Refit the rollers

Step 1 of 10

Unplug the pump

Shut down as above, then unplug the pump at the receptacle box. Always unplug the pump before working on it.

BackNext step

1. Unplug the pump. Shut down as above, then unplug the pump at the receptacle box. Always unplug the pump before working on it.
2. Unlock the cover. Slide the vertical tab on the pump head 180 degrees, from left to right, to unlock the cover latch.
3. Slide the cover off. Push up on the cover’s raised edge to slide it off.
4. Remove the tube. Release the tube’s fittings from their slots and lift the tube out.
5. Remove the rollers. Remove the roller assembly.
6. Clean. Clean residue from the pump head housing, the rollers and the cover with a non-citrus all-purpose cleaner.
7. Check the cover. Check the cover for cracks, and replace it if it is cracked.
8. Check the rollers. Make sure the rollers spin freely.
9. Replace worn rollers. Replace the roller assembly if it is seized, has excessive side play from bore wear, or its rollers are visibly worn.
10. Refit the rollers. Reinstall the roller assembly. Then fit the new tube, the spare from the door envelope, following Stenner’s Install New Tube steps.

Before you call for service. Before any service except the monthly nozzle buttons, turn the cabinet power switch off and close the cabinet water valve.

Still not right? Call Molitron: 303-969-8888 · cleanair@molitron.com.

MOAS and its component parts are warranted to be free from defects in material and workmanship for 12 months from the date of shipment. The component parts are:

• Electrical control panel
• Air compressor
• Solution metering pump
• Liquid level switch
• Miscellaneous electrical components

What’s covered

Should any part of the equipment prove defective in material or workmanship within the 12-month warranty period, upon examination by the factory, that part will be repaired or replaced by the factory at no charge, for parts only. All labor costs incurred in connection with the repair or replacement are not included. The factory does not accept returns of Molitron products.

Not covered

Parts damaged by the freight carrier between the factory and the destination, or by the installing contractor. The factory is not liable for incidental and consequential losses and damages potentially attributable to malfunctioning equipment.

The warranty does not apply if

• MOAS is not installed by a qualified installer according to the factory’s installation instructions shipped with the product.
• MOAS is not installed in accordance with federal, state and local codes and regulations.
• MOAS is misused or neglected.
• Factory-authorized parts and Molitron Odor Neutralizer Solution are not used.
• MOAS is not operated within its published capacity.
• The invoice is not paid within the terms of the sales agreement.

The warranty is activated once the owner’s acknowledgement (section 12) is signed and returned to the factory. Email a signed copy to cleanair@molitron.com.

Fill these in on screen, then print them or save them as PDF. Nothing you type leaves your browser.

Copy-ready text for a project specification, written only from this manual. Confirm details with Molitron for your project.

MOAS — Kitchen exhaust odor abatement system

1. Manufacturer: Molitron Company Inc. Molitron Odor Abatement System (MOAS), with standard external solution container and two atomizing nozzles.
2. Listing: ETL Listed for the United States and Canada, Intertek Report 101453585DEN-002 (UL 197, CSA C22.2 No. 109). Commercial, indoor-use, permanently connected equipment; listed rating 120 V, 3.5 A, 60 Hz.
3. Performance: up to 95% odor reduction, up to 50% smoke reduction, up to 6,000 CFM per two-nozzle system. Performance varies with cooking process, hood grease-removal performance, exhaust configuration, installation, dwell time and calibration; results are not guaranteed.
4. Cabinet: 18-gauge stainless steel, 24 W x 32 H x 8 D in, approximately 100 lb, wall-mounted on 16 in centers through two keyhole hanging tabs; ventilated indoor location, not an enclosed closet.
5. Solution container: 16-gauge stainless steel, 24 W x 12 H x 8 D in, up to 10 gallons of Molitron Odor Neutralizer Solution, wall-mounted below the cabinet, with sliding fill lid. Low-solution alarm below approximately 2 gallons: buzzer inside the cabinet and red light on top; optional 24 V remote low-solution alarm.
6. Equipment: cold-water solenoid valve and injector with refill delay timer (30 s to 8 min, set to 8 min) and float-controlled mixing container; Stenner variable-speed peristaltic metering pump; Gast air compressor; IDEC SmartRelay schedule control with Automatic/Manual operation mode switch; cooling fan.
7. Nozzles: two atomizing nozzles on 4 in square stainless steel plates, mounted on opposite sides of the exhaust duct over 1-1/2 in holes, at least 10 ft of duct upstream of the exhaust discharge.
8. Lines: black 3/8 in OD air and red 1/4 in OD solution polyethylene tubing, each through a tee to both nozzles; up to 100 ft per cabinet-to-tee-to-nozzle path, matching branches close in length; 1 in conduit recommended.
9. Utilities: 120 VAC, 20 A circuit dedicated to MOAS through the MOAS exhaust-fan interlock (supplied), which prevents operation whenever the exhaust fan is off; 1/4 in copper cold-water supply, 80 PSI maximum, with building shutoff valve; backflow protection provided by Molitron.
10. Maintenance: daily solution-level check; monthly nozzle cleaning, leak check, alarm test, clock check and intake-muffler filter service.

Planning a project? Read the installation planning guide, or contact Molitron for drawings and project questions.