Installation and operation manual for multi zone mixing module MOH2
Installation and operation manual MOH2 Design MOH2 base module Schematics 16 19 12 2 Control 7 1 14 5 4 6 9 11 8 3 15 10 13 18 17 1 2 3 4 5 6 7 Circulator pump Floor heating loop feed side Floor heating loop return side Control valve Presetting knob for control valve Bypass valve Check valve for filling of floor heating loops 8 Boiler loop feed side 9 Boiler loop return side 10 Ball valve boiler loop feed side 11 Ball valve boiler loop return side 2 12 Fill valve 13 Drain valve 14 Sensor p
Installation and operation manual MOH2 Table of contents Design MOH2 base module .................................................................. 2 Application of the MOH2 mixing module ............................................... 4 Construction .......................................................................................... 4 Function ................................................................................................ 4 Attaching a manifold to the MOH2 to base module ............
Installation and operation manual MOH2 Application of the MOH2 mixing module Connection of low temperature heating systems to the boiler loop, for example • Floor heating systems • Wall heating systems Installation of the MOH2 is possible in the manifold cabinet, because • • • It is very compact It operates very quietly In multifamily dwellings, the feed temperature for the low temperature loop can be selected individually for each apartment.
Installation and operation manual MOH2 Control 18 16 17 8 10 14 5 4 2 7 1 12 6 15 9 11 3 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 www.lainginc.
Installation and operation manual MOH2 Presetting knob for control valve • The control valve is equipped with a presetting knob 5, with which the maximum amount of water from the boiler loop can be reduced. The unit is shipped with the presetting knob completely open. Bypass for step-down control • If the bypass valve 6 is opened, a small quantity of boiler feed water will run constantly through the mixing module.
Installation and operation manual MOH2 Attaching other kinds of manifolds • • • The flanges contain a 1" female thread to enable connection of other kinds of manifolds. Attach the manifolds here using a proper pipe thread sealant If the manifolds should be offset, use a spacer or a longer insert. We recommend to use a union connection between the manifolds and the base module. This facilitates disassembly in case of repairs.
Installation and operation manual MOH2 Installation of the MOH2 station Installation options The MOH2 station can be installed in two different ways. The mounting hardware required for both ways is included with the station. • • Parallel installation: the floor heating pipes are guided parallel to the wall. At the place were the pipes leave the floor, they have to be fastened to ensure that they come straight up into the manifold.
Installation and operation manual MOH2 Angled installation The picture below shows the angled installation with the mounting hardware attached accordingly • Use the 0.8‘‘ (20 mm) and the 0.87‘‘ (22 mm) spacer at the upper mounting eyelet • Use the 0.2‘‘ (5 mm) spacer at the lower mounting eyelet • Turn the rubber grommets in such a way that they are parallel to the wall. • Fix the manifold by attaching the side of the mounting bracket with the small hole spacing to the manifold.
Installation and operation manual MOH2 If you purchased the station on mounting rails • Attach the station directly to the wall • Observe the above advice for avoiding noise problems • You can use the mounting rails to mark the mounting holes before drilling If you purchased the station with cabinet • Remove the front cover of the cabinet • Install the station in the appropriate niche in the wall and attach it there • Cover the station with plastic film to keep dirt out • Use plaster to fill the space betwe
Installation and operation manual MOH2 Connection of the controls For the connection of controls, the MOH2 base module has 4 positions for thermal sensors [see sketch on page 2] • Floor heating feed temperature for control and display [wet sensor] • Floor heating feed temperature for safety control [dry sensor] • Floor heating return temperature [wet sensor] • Boiler feed temperature [wet sensor] Installation of wet sensors • The sensors are directly in contact with the water.
Installation and operation manual MOH2 With the help of this bypass, the boiler feed temperature can be sensed at the boiler feed connection even when the control valve is closed. Setting [only in conjunction with a step down control] • Open the bypass valve sufficiently to allow correct sensing of the boiler feed temperature even when the control valve is closed. The setting depends on the length of the boiler feed pipe, the insulation and the differential pressure of the boiler loop.
Installation and operation manual MOH2 Presetting knob for control valve 5 Application • With this knob you can adjust the resistance value of the MOH2 control valve. • This controls the maximum amount of water which enters the MOH2 from the boiler loop with the control valve fully open. • Use this knob to adapt the MOH2 to the heating system and to optimize the control characteristics.
Installation and operation manual MOH2 Filling the system Preparation • Close the ball valves 10 and 11 at the boiler feed and return of the MOH2 mixing module. • Open the feed valve and return flow adjuster of the left most floor heating loop directly adjacent to the fill- and drain valves 12 and 13 • Close the feed valves and return flow adjusters of all other floor heating loops. Filling of the boiler loop • Fill the boiler loop as usual. No special precautions are necessary.
Installation and operation manual MOH2 Pressure test • Pressurize the pressure hose • Now all heating loops including the compression fittings are being pressure tested. Start-up Preconditions: • The system boiler loop must be filled properly. • The floor heating system must be filled properly • A suitable control for the MOH2 module must be in place. Caution: operation without a suitable control can result in overheating of the floor heating system.
Installation and operation manual MOH2 Technical data Maximum system pressure Circulator Floor heating loop Maximum temperature Feed connection 145 PSI (10 bar ) see diagram 140°F (60°C) 1" female thread/flange for segmented plastic manifold Return connection... Boiler loop Maximum temperature Feed connection Return connection...
Installation and operation manual MOH2 Pump curve The pump curve shows the hydraulic performance available at the manifold connections 14 12 10 Pump head [ft] 8 6 4 2 0 0 2 4 6 8 10 12 14 Flow rate [US GPM] www.lainginc.
Installation and operation manual MOH2 Dimensions Side view for angled installation 18 Side view for paralell installation www.lainginc.
Installation and operation manual MOH2 Changing out the circulator Preparation • Caution: only a properly licensed electrician should disconnect and reconnect the circulator. • Remove electrical power even if you only want to clean the circulator and not remove it. • Close the ball valves 10 and 11 on the boiler feed and return side • Connect the drain hose to the lower drain valve 13. In this way, the check valve 7 will close automatically and the manifold will not drain completely.
Installation and operation manual MOH2 Troubleshooting • If you use Laing controls, you’ll get error messages for typical errors. You find the explanation of these error messages in the manual of the control. In most cases, this will answer your question. Step-down control doesn’t work: • • The sensors for boiler feed temperature and floor heating feed temperature have not been connected properly. Connect sensors according to the appropriate instruction.
Installation and operation manual MOH2 www.lainginc.
03282006 Subject to change without notice Laing Thermotech, Inc. · 830 Bay Blvd. Suite #101 · Chula Vista, CA 91911 Phone: (619) 575-7466 · Fax: (619) 575-2739 · E-Mail technicalsupport@lainginc.com or customerservice@lainginc.com · Internet: www.lainginc.
