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Product Assembly Manuals
Electric Hot Tubs
Please check the product code stamped on our shipping crate and refer to the corresponding installation manual.
Electric Hot Tub Assembly
Plumbing Configuration
As seen in the images below, the pump pulls cold water from two suction points on the tub. The two suction points are both on the bottom of the tub. The water from the two suctions is combined at a T-joint then fed into the pump. Because the hot tub is curved, flex pipe must be used to wrap around the sides of the tub body. The pump then pushes the water through the filter and into the bottom of the heater. Hot water is returned from the top of the heater to the tub via the single hot water return.
When you build your hot tub body, we recommend placing the first suction stave on the base, then placing 5 or 6 regular staves (i.e., no pre-cut holes), then placing the return stave, then finally placing the second suction stave. This design is illustrated in the diagram below. This may need to be adjusted based on your site conditions.
The electrical setup for our hot tubs requires two separate breakers. If you have a 5.5kw heater you need a 40A breaker for the heater and a 20A breaker for the control unit and pump. If you have a 11kw heater you need a 60A breaker for the heater and 20A breaker for the control unit and pump.
The spa heater has an internal pressure switch, which is engaged when the pump is running and creating pressure in the plumbing system. This means the heater can be left always ON at the breaker. You simply need to set your preferred water temperature on the back of the heater unit. Once the temperature is set, the system can be operated via the timer control which turns the pump ON and OFF. The heater will not run unless the pressure switch is engaged by the pump.
Please note the heater will disengage once the water has reached your set temperature. For example if you have your water temperature set to 102F, the heater will disengage when the water temperature reaches 102F even if the pump continues to run.
All our heaters (both 5.5kw and 11kw) run on 240v power. The line is generally a 6 gauge or a 4 gauge depending on the distance from the breaker. Your electrician will make this determination. Some of our circulation pumps are 240v, however the majority run on 120v. The AS-TC-94 control works with both 120v and 240v pumps. The AS-TC-94 wiring differs slightly for 120v and 240v pumps, so please refer to the AS-TC-94 manual for wiring instructions. (see manual below)
Installation of the Electric Heater Kit must be performed by a qualified electrician. Please share the manuals in the section below with your electrician.
The primary components of our electric hot tub system (the heater and circulation pump) are individually UL listed. However, the Redwood Outdoors electric hot tub heating system is not UL listed as a complete kit. You should review state and local laws and building codes prior to purchasing, as your locality may require that pool and hot tub equipment be UL listed as a complete unit.
Product Manuals for Heater & Hot Tub Control
Please share the manual below with your electrician
Control Unit Operation
The AS-TC-94 is a control unit that uses a clock timer to turn your system ON/OFF automatically. The air button attachment allows you to manually override the timer to turn the system ON/OFF.
The clock timer sets a daily cycle for your system. Set the clock and depress the hashmarks for the times of day you want the system to turn ON. We recommend that you set your system to come on at least three times per day for a minimum of one hour per cycle. This helps keep the water clean, warm and circulating.
The control unit can also be operated via the small peg on the clock face. When the peg is moved to the top (I) position, this means always ON. When the peg is moved to the bottom (O) position, this means always OFF. If the peg is left in the center position, this is TIMER mode and your clock settings will determine when the system is ON or OFF.
The air button connects to the AS-TC-94 control unit . This allows you to bypass the timer to turn the system ON/OFF with the press of a button. Important: The air button works on a 3 press loop. When using the air button for a circulation pump system such as ours (no high speed), the 2nd press is a blank. So your button cycle will be:
#1 - Pump ON
#2 - Blank (does nothing)
#3 - Timer Mode.
When using the air button, it is important to always return your system to Timer Mode when finished. Note that if you return the system to Timer Mode while your clock setting is set to an ON cycle, the system will continue to run until the clock settings shut the system OFF.
Installation of the Electric Heater Kit must be performed by a qualified electrician. Please share this manual with your electrician.
The primary components of our electric hot tub system (the heater and circulation pump) are individually UL listed. However, the Redwood Outdoors electric hot tub heating system is not UL listed as a complete kit. You should review state and local laws and building codes prior to purchasing, as your locality may require that pool and hot tub equipment be UL listed as a complete unit.
Installation of the Electric Heater Kit must be performed by a qualified electrician. Please share this manual with your electrician.
The primary components of our electric hot tub system (the heater and circulation pump) are individually UL listed. However, the Redwood Outdoors electric hot tub heating system is not UL listed as a complete kit. You should review state and local laws and building codes prior to purchasing, as your locality may require that pool and hot tub equipment be UL listed as a complete unit.